From: Benjamin Auder <benjamin.auder@somewhere>
Date: Mon, 12 Apr 2021 15:54:42 +0000 (+0200)
Subject: Several small improvements + integrate options + first working draft of Cwda
X-Git-Url: https://git.auder.net/doc/html/pieces/%7B%7B%20path%28%27fos_user_security_logout%27%29%20%7D%7D?a=commitdiff_plain;h=4313762da3237b04f204e121a20cab3ba7bb5dd2;p=vchess.git

Several small improvements + integrate options + first working draft of Cwda
---

diff --git a/TODO b/TODO
index 924b6d0e..473ea2d0 100644
--- a/TODO
+++ b/TODO
@@ -6,9 +6,18 @@ If new live game starts in background, "new game" notify OK but not first move.
 Will be used for variants with custom non-rectangular board (Hex, at least)
 Or, with other board shapes (see greenchess.net for example)
 
-Merge variants 1, 2 (3) into one with sub-variant selection when starting a game (New Game + vs engine + analyse)
-E.g. Checkered 1 & 2 into one, and so on.
-Need additional field in variant code... in a generic way (radiobutton or select or checkbox?)
+debug import game + load
+
+TODEBUG: Avalanche computer play from here
+game.fen = "r2q1bnr/3pp3/n3k1p1/6Pp/3p1B1P/p5R1/1p6/4K1NR w 26 ihii 0";
+game.fenStart = "r2q1bnr/3pp3/n3k1p1/6Pp/3p1B1P/p5R1/1p6/4K1NR w 26 ihii 0";
+game.mycolor = 'w';
+Bd6,b1 then black promotes and win, but UI freezes.
+
+Merge Orda + Empire + Hoppelpoppel + Newzealand getSlideNJumpMoves() into base_rules.js
+=> allow to simplify getPawnMoves in RoyalRace (and some getXMoves in Shatranj)
+
+Option "free placement" in Hidden
 
 #New variants:
 Chessplode
@@ -16,7 +25,6 @@ Tablut
 
 https://brainking.com/fr/GameRules?tp=128 Massacre Chess
 
-CWDA : need game options (also useful at least for Monster)
 PizzaKings https://www.chessvariants.com/unequal.dir/pizza-kings.html
 https://en.m.wikipedia.org/wiki/Chess_with_different_armies#Pizza_Kings%5B11%5D_(John_Lawson)
 
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new file mode 100644
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index 00000000..4290d9c3
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+       d="m 1059,1543 q 0,66 30,112 30,46 66,73 55,40 161,40 26,0 102,-11 62,-10 100,-14 38,-4 51,-8 38,-5 80,2 16,4 35,7 19,3 33,16 l 48,-78 q -41,-21 -87,-29 -76,-13 -133,-6 -17,2 -44,10 -27,8 -75,15 -101,16 -107,16 -39,0 -68,-10 -29,-10 -52,-22 -53,-24 -108,-113 z"
+       display="block"
+       id="path14" />
+  </g>
+</svg>
diff --git a/client/public/images/pieces/Cwda/wa.svg b/client/public/images/pieces/Cwda/ww.svg
similarity index 100%
rename from client/public/images/pieces/Cwda/wa.svg
rename to client/public/images/pieces/Cwda/ww.svg
diff --git a/client/public/images/pieces/Cwda/wy.svg b/client/public/images/pieces/Cwda/wy.svg
new file mode 100644
index 00000000..75bdb6d8
--- /dev/null
+++ b/client/public/images/pieces/Cwda/wy.svg
@@ -0,0 +1,69 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   height="100%"
+   width="100%"
+   version="1.1"
+   viewBox="0 0 2048 2048"
+   id="svg6"
+   sodipodi:docname="wy.svg"
+   inkscape:version="1.0.2 (e86c870879, 2021-01-15)">
+  <metadata
+     id="metadata12">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <defs
+     id="defs10" />
+  <sodipodi:namedview
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1"
+     objecttolerance="10"
+     gridtolerance="10"
+     guidetolerance="10"
+     inkscape:pageopacity="0"
+     inkscape:pageshadow="2"
+     inkscape:window-width="960"
+     inkscape:window-height="1060"
+     id="namedview8"
+     showgrid="false"
+     inkscape:zoom="0.43115234"
+     inkscape:cx="1024"
+     inkscape:cy="1024"
+     inkscape:window-x="0"
+     inkscape:window-y="20"
+     inkscape:window-maximized="0"
+     inkscape:current-layer="svg6"
+     inkscape:document-rotation="0" />
+  <path
+     style="color:#000000"
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+     fill-rule="nonzero"
+     display="block"
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+     id="path2" />
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+     style="color:#000000"
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+     id="path4" />
+  <path
+     style="fill:#ffd700;stroke:#000000;stroke-width:2.31937"
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+     id="path52" />
+</svg>
diff --git a/client/src/base_rules.js b/client/src/base_rules.js
index 0c20b59e..7c1c8232 100644
--- a/client/src/base_rules.js
+++ b/client/src/base_rules.js
@@ -40,7 +40,7 @@ export const ChessRules = class ChessRules {
         {
           label: "Randomness",
           variable: "randomness",
-          defaut: 2,
+          defaut: 0,
           options: [
             { label: "Deterministic", value: 0 },
             { label: "Symmetric random", value: 1 },
@@ -58,6 +58,10 @@ export const ChessRules = class ChessRules {
     //return "R" + opts.randomness;
   }
 
+  static IsValidOptions(opts) {
+    return true;
+  }
+
   // Some variants don't have flags:
   static get HasFlags() {
     return true;
@@ -368,8 +372,7 @@ export const ChessRules = class ChessRules {
 
   // Setup the initial random (asymmetric) position
   static GenRandInitFen(options) {
-    const randomness = parseInt(options.randomness, 10);
-    if (!randomness || randomness == 0)
+    if (!options.randomness || options.randomness == 0)
       // Deterministic:
       return "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w 0 ahah -";
 
@@ -746,14 +749,15 @@ export const ChessRules = class ChessRules {
 
   // Generic method to find possible moves of non-pawn pieces:
   // "sliding or jumping"
-  getSlideNJumpMoves([x, y], steps, oneStep) {
+  getSlideNJumpMoves([x, y], steps, nbSteps) {
     let moves = [];
     outerLoop: for (let step of steps) {
       let i = x + step[0];
       let j = y + step[1];
+      let stepCounter = 0;
       while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
         moves.push(this.getBasicMove([x, y], [i, j]));
-        if (!!oneStep) continue outerLoop;
+        if (nbSteps && ++stepCounter >= nbSteps) continue outerLoop;
         i += step[0];
         j += step[1];
       }
@@ -895,7 +899,7 @@ export const ChessRules = class ChessRules {
 
   // What are the knight moves from square x,y ?
   getPotentialKnightMoves(sq) {
-    return this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep");
+    return this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], 1);
   }
 
   // What are the bishop moves from square x,y ?
@@ -906,19 +910,14 @@ export const ChessRules = class ChessRules {
   // What are the queen moves from square x,y ?
   getPotentialQueenMoves(sq) {
     return this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP])
-    );
+      sq, V.steps[V.ROOK].concat(V.steps[V.BISHOP]));
   }
 
   // What are the king moves from square x,y ?
   getPotentialKingMoves(sq) {
     // Initialize with normal moves
     let moves = this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-      "oneStep"
-    );
+      sq, V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
     if (V.HasCastle && this.castleFlags[this.turn].some(v => v < V.size.y))
       moves = moves.concat(this.getCastleMoves(sq));
     return moves;
@@ -1102,13 +1101,18 @@ export const ChessRules = class ChessRules {
 
   // Generic method for non-pawn pieces ("sliding or jumping"):
   // is x,y attacked by a piece of given color ?
-  isAttackedBySlideNJump([x, y], color, piece, steps, oneStep) {
+  isAttackedBySlideNJump([x, y], color, piece, steps, nbSteps) {
     for (let step of steps) {
       let rx = x + step[0],
           ry = y + step[1];
-      while (V.OnBoard(rx, ry) && this.board[rx][ry] == V.EMPTY && !oneStep) {
+      let stepCounter = 1;
+      while (
+        V.OnBoard(rx, ry) && this.board[rx][ry] == V.EMPTY &&
+        (!nbSteps || stepCounter < nbSteps)
+      ) {
         rx += step[0];
         ry += step[1];
+        stepCounter++;
       }
       if (
         V.OnBoard(rx, ry) &&
diff --git a/client/src/components/BaseGame.vue b/client/src/components/BaseGame.vue
index 7627f2dc..4b6529ff 100644
--- a/client/src/components/BaseGame.vue
+++ b/client/src/components/BaseGame.vue
@@ -167,7 +167,8 @@ export default {
       baseGameDiv.tabIndex = 0;
       baseGameDiv.addEventListener("click", this.focusBg);
       baseGameDiv.addEventListener("keydown", this.handleKeys);
-      baseGameDiv.addEventListener("wheel", this.handleScroll);
+      if (this.st.settings.scrollmove)
+        baseGameDiv.addEventListener("wheel", this.handleScroll);
     }
     document.getElementById("eogDiv")
       .addEventListener("click", processModalClick);
@@ -340,6 +341,7 @@ export default {
         pgn += '[Url "' + params.serverUrl + '/game/' + this.game.id + '"]\n';
       if (!!this.game.cadence)
         pgn += '[Cadence "' + this.game.cadence + '"]\n';
+      pgn += '[Options "' + JSON.stringify(this.game.options) + '"]\n';
       pgn += '\n';
       for (let i = 0; i < this.moves.length; i += 2) {
         if (i > 0) pgn += " ";
diff --git a/client/src/components/ChallengeList.vue b/client/src/components/ChallengeList.vue
index 21179a65..a1c46cdc 100644
--- a/client/src/components/ChallengeList.vue
+++ b/client/src/components/ChallengeList.vue
@@ -62,17 +62,14 @@ export default {
         return c.to || this.st.tr["Any player"];
       return c.from.name || "@nonymous";
     },
+    // TODO: duplicated from Hall
     getRandomnessClass: function(c) {
-      if (
-        // TODO: one extra test here
-        !Number.isInteger(c.options.randomness) &&
-        !parseInt(c.options.randomness, 10)
-      ) {
+      const opts = c.options;
+      if (opts.randomness === undefined && opts.random === undefined)
         return {};
-      }
-      return {
-        ["random-" + c.options.randomness]: true
-      };
+      if (opts.randomness !== undefined)
+        return { ["random-" + opts.randomness]: true };
+      return { ["random-" + (opts.random ? 2 : 0)]: true };
     }
   }
 };
diff --git a/client/src/components/Settings.vue b/client/src/components/Settings.vue
index 514e7049..e04cbdfa 100644
--- a/client/src/components/Settings.vue
+++ b/client/src/components/Settings.vue
@@ -60,6 +60,13 @@ div
             type="checkbox"
             v-model="st.settings.gotonext"
           )
+        fieldset(v-if="desktopBrowser")
+          label(for="setScrollmove")
+            | {{ st.tr["Mouse scroll to replay moves"] }}
+          input#setScrollmove(
+            type="checkbox"
+            v-model="st.settings.scrollmove"
+          )
 </template>
 
 <script>
@@ -83,6 +90,9 @@ export default {
   computed: {
     flagImage: function() {
       return `/images/flags/${this.st.lang}.svg`;
+    },
+    desktopBrowser: function() {
+      return !("ontouchstart" in window);
     }
   },
   methods: {
diff --git a/client/src/components/UploadGame.vue b/client/src/components/UploadGame.vue
index ea85ea75..b57a23e7 100644
--- a/client/src/components/UploadGame.vue
+++ b/client/src/components/UploadGame.vue
@@ -64,6 +64,9 @@ export default {
           case "Cadence":
             game.cadence = value;
             break;
+          case "Options":
+            game.options = value;
+            break;
         }
         idx++;
       }
diff --git a/client/src/data/challengeCheck.js b/client/src/data/challengeCheck.js
index 7665f6f4..554dfdff 100644
--- a/client/src/data/challengeCheck.js
+++ b/client/src/data/challengeCheck.js
@@ -19,5 +19,7 @@ export function checkChallenge(c) {
   }
   else c.fen = "";
 
+  if (!V.IsValidOptions(c.options)) return "Invalid options";
+
   return "";
 }
diff --git a/client/src/store.js b/client/src/store.js
index 13c600b7..6489b937 100644
--- a/client/src/store.js
+++ b/client/src/store.js
@@ -79,17 +79,18 @@ export const store = {
       this.state.user.notify = json.notify;
     });
     // Settings initialized with values from localStorage
-    const getItemDefaultTrue = (item) => {
+    const getItemDefault = (item, defaut) => {
       const value = localStorage.getItem(item);
-      if (!value) return true;
+      if (!value) return defaut;
       return value == "true";
     };
     this.state.settings = {
       bcolor: localStorage.getItem("bcolor") || "lichess",
-      sound: getItemDefaultTrue("sound"),
-      hints: getItemDefaultTrue("hints"),
-      highlight: getItemDefaultTrue("highlight"),
-      gotonext: getItemDefaultTrue("gotonext"),
+      sound: getItemDefault("sound", true),
+      hints: getItemDefault("hints", true),
+      highlight: getItemDefault("highlight", true),
+      gotonext: getItemDefault("gotonext", true),
+      scrollmove: getItemDefault("scrollmove", false)
     };
     const supportedLangs = ["en", "es", "fr"];
     const navLanguage = navigator.language.substr(0, 2);
diff --git a/client/src/translations/about/en.pug b/client/src/translations/about/en.pug
index 82fabd0e..5ab686be 100644
--- a/client/src/translations/about/en.pug
+++ b/client/src/translations/about/en.pug
@@ -14,9 +14,8 @@ h3 Notes
 p ELO rating is purposely absent from this website.
 
 p.
-  Games start by default with a random asymmetric position.
-  Random symmetric or even deterministic positions are available too,
-  if you prefer more fairness (but also less fun? :-P ).
+  Most games can start from three initial setups: deterministic
+  (the usual one), or random &ndash; symmetric or not.
 
 h3 Contribute
 
diff --git a/client/src/translations/about/es.pug b/client/src/translations/about/es.pug
index 95f69c06..ffbc5c33 100644
--- a/client/src/translations/about/es.pug
+++ b/client/src/translations/about/es.pug
@@ -13,9 +13,8 @@ h3 Notas
 p El ranking ELO está ausente a propósito de este sitio.
 
 p.
-  Las partidas comienzan por defecto con una posición aleatoria no simétrica.
-  Es posible una posición aleatoria simétrica o incluso determinista,
-  si prefieres más justicia (¿pero también más aburrimiento? :-P).
+  La mayoría de los juegos pueden comenzar desde tres tipos de posiciones:
+  determinista (patrón habitual) o aleatorio &ndash; simétrico o no.
 
 h3 Contribuir
 
diff --git a/client/src/translations/about/fr.pug b/client/src/translations/about/fr.pug
index eb47ccd3..c6d076e7 100644
--- a/client/src/translations/about/fr.pug
+++ b/client/src/translations/about/fr.pug
@@ -14,9 +14,8 @@ h3 Notes
 p Le classement ELO est à dessein absent de ce site.
 
 p.
-  Les parties démarrent par défaut avec une position aléatoire non symétrique.
-  Une position aléatoire symétrique ou même déterministe est possible,
-  si vous préférez plus de justice (mais aussi plus d'ennui ? :-P ).
+  La plupart des jeux peuvent démarrer depuis trois types de positions :
+  déterministe (schéma habituel), ou aléatoire &ndash; symétrique ou non.
 
 h3 Contribuer
 
diff --git a/client/src/translations/en.js b/client/src/translations/en.js
index 832bcb9d..cdcb7eaf 100644
--- a/client/src/translations/en.js
+++ b/client/src/translations/en.js
@@ -11,6 +11,8 @@ export const translations = {
   "Any player": "Any player",
   Apply: "Apply",
   "Are you sure?": "Are you sure?",
+  "Army 1": "Army 1",
+  "Army 2": "Army 2",
   "Asymmetric random": "Asymmetric random",
   "Authentication successful!": "Authentication successful!",
   "Back to list": "Back to list",
@@ -31,6 +33,7 @@ export const translations = {
   "Clear history": "Clear history",
   Code: "Code",
   Color: "Color",
+  "Colorbound Clobberers": "Colorbound Clobberers",
   "Color option only for targeted challenge": "Color option only for targeted challenge",
   "Connection token sent. Check your emails!": "Connection token sent. Check your emails!",
   Contact: "Contact",
@@ -49,6 +52,8 @@ export const translations = {
   "Error: try to delete cookies": "Error: try to delete cookies",
   "Errors in FEN": "Errors in FEN",
   "Example game": "Example game",
+  Fide: "Fide",
+  Four: "Four",
   Go: "Go",
   green: "green",
   Hall: "Hall",
@@ -56,6 +61,7 @@ export const translations = {
   "Imported games": "Imported games",
   Instructions: "Instructions",
   "Invalid email": "Invalid email",
+  "Invalid options": "Invalid options",
   "It's your turn!": "It's your turn!",
   "is not online": "is not online",
   Language: "Language",
@@ -73,6 +79,7 @@ export const translations = {
   "Missing name": "Missing name",
   "Missing solution": "Missing solution",
   "Modifications applied!": "Modifications applied!",
+  "Mouse scroll to replay moves": "Mouse scroll to replay moves",
   "Move played:": "Move played:",
   "Mutual agreement": "Mutual agreement",
   "My games": "My games",
@@ -91,9 +98,12 @@ export const translations = {
   "No subject. Send anyway?": "No subject. Send anyway?",
   "Notifications by email": "Notifications by email",
   "Number": "Number",
+  "Number of pawns": "Number of pawns",
+  "Nutty Knights": "Nutty Knights",
   Observe: "Observe",
   "Offer draw?": "Offer draw?",
   "Opponent action": "Opponent action",
+  Options: "Options",
   orange: "orange",
   "Participant(s):": "Participant(s):",
   "Play with": "Play with",
@@ -108,9 +118,12 @@ export const translations = {
   Previous_p: "Previous",
   "Processing... Please wait": "Processing... Please wait",
   Problems: "Problems",
+  Random: "Random",
+  Randomness: "Randomness",
   Refuse: "Refuse",
   Register: "Register",
   "Registration complete! Please check your emails now": "Registration complete! Please check your emails now",
+  "Remarkable Rookies": "Remarkable Rookies",
   Rematch: "Rematch",
   "Rematch in progress": "Rematch in progress",
   "Remove game?": "Remove game?",
@@ -127,6 +140,7 @@ export const translations = {
   "Show next game after a move": "Show next game after move",
   "Show possible moves": "Show possible moves",
   "Show solution": "Show solution",
+  Six: "Six",
   Solution: "Solution",
   "Sound alert at game start": "Sound alert at game start",
   Stop: "Stop",
@@ -138,6 +152,7 @@ export const translations = {
   "The game was already imported": "The game was already imported",
   "Three repetitions": "Three repetitions",
   Time: "Time",
+  Two: "Two",
   "Undetermined result": "Undetermined result",
   Update: "Update",
   "Upload a game": "Upload a game",
@@ -155,6 +170,7 @@ export const translations = {
   "White win": "White win",
   "Who's there?": "Who's there?",
   With: "With",
+  "With switch": "With switch",
   with: "with",
   "Wrong color": "Wrong color",
   "Wrong time control": "Wrong time control",
@@ -404,9 +420,4 @@ export const translations = {
   "vg30": "Pieces can temporarily borrow powers from others.",
   "vt31": "Miscelleanous",
   "vg31": "These variants are not classified yet, generally because they are the only one of their kind on this website.",
-
-  // Variants' options
-  "Options": "Options",
-  "Randomness": "Randomness",
-  "With switch": "With switch",
 };
diff --git a/client/src/translations/es.js b/client/src/translations/es.js
index 4c458fb3..0e8af8cb 100644
--- a/client/src/translations/es.js
+++ b/client/src/translations/es.js
@@ -11,6 +11,8 @@ export const translations = {
   "Any player": "Cualquier jugador",
   Apply: "Aplicar",
   "Are you sure?": "¿Está usted seguro?",
+  "Army 1": "Ejército 1",
+  "Army 2": "Ejército 2",
   "Asymmetric random": "Aleatorio asimétrico",
   "Authentication successful!": "¡Autenticación exitosa!",
   "Back to list": "Volver a la lista",
@@ -31,6 +33,7 @@ export const translations = {
   "Clear history": "Clara historia",
   Code: "Código",
   Color: "Color",
+  "Colorbound Clobberers": "Batidores Unicolor",
   "Color option only for targeted challenge": "Elección de color solo para desafíos específicos",
   "Connection token sent. Check your emails!": "Token de conexión enviado. ¡Revisa tus correos!",
   Contact: "Contacto",
@@ -49,6 +52,8 @@ export const translations = {
   "Error: try to delete cookies": "Error: intente eliminar las cookies",
   "Errors in FEN": "FEN errónea",
   "Example game": "Ejemplo de partida",
+  Fide: "Fide",
+  Four: "Cuatro",
   Go: "Go",
   green: "verde",
   Hall: "Salón",
@@ -56,6 +61,7 @@ export const translations = {
   "Imported games": "Partidas importadas",
   Instructions: "Instrucciones",
   "Invalid email": "Email inválido",
+  "Invalid options": "Optiones inválidas",
   "It's your turn!": "¡Es su turno!",
   "is not online": "no está en línea",
   Language: "Idioma",
@@ -73,6 +79,7 @@ export const translations = {
   "Missing name": "Nombre falta",
   "Missing solution": "Solución falta",
   "Modifications applied!": "¡Modificaciones aplicadas!",
+  "Mouse scroll to replay moves": "Pergamino mouse para repetir las jugadas",
   "Move played:": "Movimiento jugado:",
   "Mutual agreement": "Acuerdo mutuo",
   "My games": "Mis partidas",
@@ -91,9 +98,12 @@ export const translations = {
   "No subject. Send anyway?": "Sin asunto. ¿Enviar sin embargo?",
   "Notifications by email": "Notificaciones por email",
   "Number": "Número",
+  "Number of pawns": "Número de peones",
+  "Nutty Knights": "Caballeros Locos",
   "Offer draw?": "¿Ofrecer tablas?",
   Observe: "Observar",
   "Opponent action": "Acción del adversario",
+  Options: "Optiones",
   orange: "naranja",
   "Participant(s):": "Participante(s):",
   "Play with": "Jugar con",
@@ -108,9 +118,12 @@ export const translations = {
   Previous_n: "Anterior",
   "Processing... Please wait": "Procesando... por favor espere",
   Problems: "Problemas",
+  Random: "Aleatorio",
+  Randomness: "Grado de azar",
   Refuse: "Rechazar",
   Register: "Inscribirse",
   "Registration complete! Please check your emails now": "¡Registro completo! Revise sus correos electrónicos ahora",
+  "Remarkable Rookies": "Reclutas Notables",
   Rematch: "Revancha",
   "Rematch in progress": "Revancha en progreso",
   "Remove game?": "¿Eliminar la partida?",
@@ -127,6 +140,7 @@ export const translations = {
   "Show next game after a move": "Mostrar la siguiente partida después de una jugada",
   "Show possible moves": "Mostrar posibles movimientos",
   "Show solution": "Mostrar la solución",
+  Six: "Seis",
   Solution: "Solución",
   "Sound alert at game start": "Alerta audible cuando comienza una partida",
   Stop: "Interrupción",
@@ -138,6 +152,7 @@ export const translations = {
   "The game was already imported": "La partida ya ha sido importada",
   "Three repetitions": "Tres repeticiones",
   Time: "Tiempo",
+  Two: "Dos",
   "Undetermined result": "Resultado indeterminado",
   Update: "Actualización",
   "Upload a game": "Enviar una partida",
@@ -155,6 +170,7 @@ export const translations = {
   "White win": "Las blancas ganan",
   "Who's there?": "¿Quién está ahí?",
   With: "Con",
+  "With switch": "Con switch",
   with: "con",
   "Wrong color": "Color incorrecto",
   "Wrong time control": "Cadencia errónea",
@@ -404,9 +420,4 @@ export const translations = {
   "vg30": "Las piezas pueden temporalmente tomar prestados poderes de otras",
   "vt31": "Varios",
   "vg31": "Estas variantes aún no están clasificadas, en general porque son el único representante de su tipo en este sitio.",
-
-  // Variants' options
-  "Options": "Optiones",
-  "Randomness": "Grado de azar",
-  "With switch": "Con switch",
 };
diff --git a/client/src/translations/faq/en.pug b/client/src/translations/faq/en.pug
index 0f914b71..3062b0b0 100644
--- a/client/src/translations/faq/en.pug
+++ b/client/src/translations/faq/en.pug
@@ -7,14 +7,6 @@
   against the computer. Keep in mind that the "engine" is generally quite weak.
   It's here for illustration and learning purpose only.
 
-.question.
-  The initial position looks weird?
-.answer.
-  Everything is randomized by default - when possible. This is the initial
-  spirit of the website. However, you can change this for a practice game
-  using the upper-right Settings menu ("randomness level"), and for a game
-  from main Hall by changing this same parameter in the form.
-
 .question.
   The bot is too weak! Where should I continue?
 .answer
diff --git a/client/src/translations/faq/es.pug b/client/src/translations/faq/es.pug
index 8a8f464e..23f12c32 100644
--- a/client/src/translations/faq/es.pug
+++ b/client/src/translations/faq/es.pug
@@ -9,15 +9,6 @@
   en general bastante débil.
   Se utiliza solo para ilustrar y aprender las reglas.
 
-.question.
-  ¿Es extraña la posición inicial?
-.answer.
-  Todo es aleatorio por defecto - cuando es posible. Es el espíritu
-  inicial del sitio. Sin embargo, puede cambiar esto por una partida de
-  entrenamiento a través de la configuración en la parte superior derecha
-  ("grado de azar"), y para una partida del Salón principal cambiando el mismo
-  parámetro en el formulario.
-
 .question.
   ¡La computadora está jugando demasiado mal! ¿Dónde debo continuar?
 .answer
diff --git a/client/src/translations/faq/fr.pug b/client/src/translations/faq/fr.pug
index cb89549f..e5fce105 100644
--- a/client/src/translations/faq/fr.pug
+++ b/client/src/translations/faq/fr.pug
@@ -8,15 +8,6 @@
   en général plutôt faible.
   Il sert à illustrer et à apprendre les règles seulement.
 
-.question.
-  La position initiale est bizarre ?
-.answer.
-  Tout est rendu aléatoire par défaut - quand c'est possible. C'est l'esprit
-  initial du site. Cependant, vous pouvez changer cela pour une partie
-  d'entraînement via les Réglages en haut à droite ("degré d'aléa"), et pour
-  une partie depuis le Salon principal en changeant le même paramètre dans le
-  formulaire.
-
 .question.
   L'ordinateur joue trop mal ! Où dois-je continuer ?
 .answer
diff --git a/client/src/translations/fr.js b/client/src/translations/fr.js
index 5d3dbf1d..bc8b4080 100644
--- a/client/src/translations/fr.js
+++ b/client/src/translations/fr.js
@@ -10,9 +10,11 @@ export const translations = {
   "Analysis disabled for this variant": "Analyse désactivée pour cette variante",
   "Any player": "N'importe qui",
   Apply: "Appliquer",
-  "Authentication successful!": "Authentification réussie !",
   "Are you sure?": "Étes vous sûr?",
+  "Army 1": "Armée 1",
+  "Army 2": "Armée 2",
   "Asymmetric random": "Aléatoire asymétrique",
+  "Authentication successful!": "Authentification réussie !",
   "Back to list": "Retour à la liste",
   "Black": "Noirs",
   "Black to move": "Trait aux noirs",
@@ -31,6 +33,7 @@ export const translations = {
   "Clear history": "Effacer l'historique",
   Code: "Code",
   Color: "Couleur",
+  "Colorbound Clobberers": "Tabasseurs Unicolores",
   "Color option only for targeted challenge": "Choix de la couleur seulement pour défis ciblés",
   "Connection token sent. Check your emails!": "Token de connection envoyé. Allez voir vos emails !",
   Contact: "Contact",
@@ -49,6 +52,8 @@ export const translations = {
   "Error: try to delete cookies": "Erreur : essayez de supprimer les cookies",
   "Errors in FEN": "FEN erronée",
   "Example game": "Partie exemple",
+  Fide: "Fide",
+  Four: "Quatre",
   Go: "Go",
   green: "vert",
   Hall: "Salon",
@@ -56,6 +61,7 @@ export const translations = {
   "Imported games": "Parties importées",
   Instructions: "Instructions",
   "Invalid email": "Email invalide",
+  "Invalid options": "Options invalides",
   "It's your turn!": "À vous de jouer !",
   "is not online": "n'est pas en ligne",
   Language: "Langue",
@@ -73,6 +79,7 @@ export const translations = {
   "Missing name": "Nom manquant",
   "Missing solution": "Solution manquante",
   "Modifications applied!": "Modifications effectuées !",
+  "Mouse scroll to replay moves": "Défilement souris pour rejouer les coups",
   "Move played:": "Coup joué :",
   "Mutual agreement": "Accord mutuel",
   "My games": "Mes parties",
@@ -91,9 +98,12 @@ export const translations = {
   "No subject. Send anyway?": "Pas de sujet. Envoyer quand-même ??",
   "Notifications by email": "Notifications par email",
   "Number": "Numéro",
+  "Number of pawns": "Nombre de pions",
+  "Nutty Knights": "Chevaliers Fous",
   "Offer draw?": "Proposer nulle ?",
   Observe: "Observer",
   "Opponent action": "Action de l'adversaire",
+  Options: "Options",
   orange: "orange",
   "Participant(s):": "Participant(s) :",
   "Play with": "Jouer avec",
@@ -108,9 +118,12 @@ export const translations = {
   Previous_n: "Précédente",
   "Processing... Please wait": "Traitement en cours... Attendez SVP",
   Problems: "Problèmes",
+  Random: "Aléatoire",
+  Randomness: "Degré d'aléa",
   Refuse: "Refuser",
   Register: "S'inscrire",
   "Registration complete! Please check your emails now": "Enregistrement terminé ! Allez voir vos emails maintenant",
+  "Remarkable Rookies": "Recrues Remarquables",
   Rematch: "Rejouer",
   "Rematch in progress": "Revanche en cours",
   "Remove game?": "Supprimer la partie ?",
@@ -127,6 +140,7 @@ export const translations = {
   "Show next game after a move": "Montrer la partie suivante après un coup",
   "Show possible moves": "Montrer les coups possibles",
   "Show solution": "Montrer la solution",
+  Six: "Six",
   Solution: "Solution",
   "Sound alert at game start": "Alerte sonore quand une partie démarre",
   Stop: "Arrêt",
@@ -138,6 +152,7 @@ export const translations = {
   "The game was already imported": "La partie a déjà été importée",
   "Three repetitions": "Triple répétition",
   Time: "Temps",
+  Two: "Deux",
   "Undetermined result": "Résultat indéterminé",
   Update: "Mise à jour",
   "Upload a game": "Envoyer une partie",
@@ -155,6 +170,7 @@ export const translations = {
   "White win": "Les blancs gagnent",
   "Who's there?": "Qui est là ?",
   With: "Avec",
+  "With switch": "Avec switch",
   with: "avec",
   "Wrong color": "Mauvaise couleur",
   "Wrong time control": "Cadence erronée",
@@ -404,9 +420,4 @@ export const translations = {
   "vg30": "Les pièces peuvent temporairement emprunter des pouvoir aux autres",
   "vt31": "Divers",
   "vg31": "Ces variantes ne sont pas encore classées, en général car elles sont l'unique représentant de leur type sur ce site.",
-
-  // Variants' options
-  "Options": "Options",
-  "Randomness": "Degré d'aléa",
-  "With switch": "Avec switch",
 };
diff --git a/client/src/translations/rules/Capture/en.pug b/client/src/translations/rules/Capture/en.pug
index 0007569b..64246b06 100644
--- a/client/src/translations/rules/Capture/en.pug
+++ b/client/src/translations/rules/Capture/en.pug
@@ -18,8 +18,7 @@ figure.diagram-container
 h3 More information
 
 p
-  | The variant idea was suggested recently (2020) by Vincent Rothuis.
-  | It is mentioned on 
+  | The variant is mentioned on 
   a(href="https://www.chessvariants.com/other.dir/modest-various.html")
     | this page
   | .
diff --git a/client/src/translations/rules/Capture/es.pug b/client/src/translations/rules/Capture/es.pug
index 7cd18827..a38b8ca1 100644
--- a/client/src/translations/rules/Capture/es.pug
+++ b/client/src/translations/rules/Capture/es.pug
@@ -18,8 +18,7 @@ figure.diagram-container
 h3 Más información
 
 p
-  | Esta idea fue sugerida recientemente (2020) por Vincent Rothuis.
-  | La variante es mencionada en 
+  | Esta variante es mencionada en 
   a(href="https://www.chessvariants.com/other.dir/modest-various.html")
     | esta página
   | .
diff --git a/client/src/translations/rules/Capture/fr.pug b/client/src/translations/rules/Capture/fr.pug
index e956d8ab..b04fd911 100644
--- a/client/src/translations/rules/Capture/fr.pug
+++ b/client/src/translations/rules/Capture/fr.pug
@@ -18,8 +18,7 @@ figure.diagram-container
 h3 Plus d'information
 
 p
-  | Cette idée a été suggérée récemment (2020) par Vincent Rothuis.
-  | La variante est mentionnée sur 
+  | Cette variante est mentionnée sur 
   a(href="https://www.chessvariants.com/other.dir/modest-various.html")
     | cette page
   | .
diff --git a/client/src/translations/rules/Cwda/en.pug b/client/src/translations/rules/Cwda/en.pug
index 603c8d7e..30c016d2 100644
--- a/client/src/translations/rules/Cwda/en.pug
+++ b/client/src/translations/rules/Cwda/en.pug
@@ -1,46 +1,103 @@
 p.boxed
-  | TODO: other armies as well
-  | Black pieces are replaced by a new army, where most pieces are quite
-  | colorbound.
+  | White and black pieces are replaced by different armies.
 
-p Black pawns and king move as usual, but the other pieces do not:
+p.
+  Pawns and kings move as usual, but the other pieces generally do not.
+  Indeed, before the game start you must select two armies, defining
+  new movements for "rooks", "knights", "bishops" and "queens".
+
+p Pieces movements are described using these simple pieces:
 ul
-  li Rook = bishop + dabbabah (D),
-  li Knight = wazir + alfil = "phoenix" (H),
-  li Bishop = ferz + alfil + dabbabah (A),
-  li Queen = bishop + knight = "princess" (S).
+  li Dabbabah = jump two squares orthogonally
+  li Alfil = jump two squares diagonally
+  li Wazir = one square orthogonally
+  li Ferz = one square diagonally
+  li Three leaper (L3) = jump three squares orthogonally
+  li Narrow knight = knight without "2+1 lateral moves"
+
+p Pawns can be promoted into a piece of any of the two armies playing.
+
+h3 The Colorbound Clobberers
+
+figure.showPieces.text-center
+  img(src="/images/pieces/Cwda/bd.svg")
+  img(src="/images/pieces/Cwda/ww.svg")
+  img(src="/images/pieces/Cwda/bf.svg")
+  img(src="/images/pieces/Cwda/wc.svg")
+
+ul
+  li Rook = bishop + dabbabah = "bede" (D),
+  li Knight = wazir + alfil = "waffle" (W),
+  li Bishop = ferz + alfil + dabbabah = "fad" (F),
+  li Queen = bishop + knight = "cardinal" (C).
+
+figure.diagram-container
+  .diagram.diag12
+    | fen:8/8/8/3D4/8/8/8/8 a8,b7,c6,e4,f3,g2,h1,c4,b3,a2,e6,f7,g8,f5,d3,b5,d7:
+  .diagram.diag22
+    | fen:8/8/8/4w3/8/8/8/8 e6,f5,e4,d5,c7,g7,g3,c3:
+  figcaption.
+    Moves of the Bede on the left, and of the Waffle on the right.
+
 p.
-  The Ferz and Wazir move respectively like a single-step bishop, and
-  single-step rook. The Alfil and Dabbabah move respectively like a
-  double-step bishop and a double-step rook. They can both leap over a piece.
+  When castling large, the king and rook arrive respectively on
+  b1/b8 and c1/c8 so that the rook remains on the same color.
+
+h3 The Nutty Knights
+
+figure.showPieces.text-center
+  img(src="/images/pieces/Cwda/bg.svg")
+  img(src="/images/pieces/Cwda/wi.svg")
+  img(src="/images/pieces/Cwda/bt.svg")
+  img(src="/images/pieces/Cwda/wl.svg")
+
+ul
+  li Rook = rook forward and sideways + king backwards = "charging rook" (G),
+  li Knight = narrow knight + ferz = "fibnif" (I),
+  li.
+    Bishop = knight forward + king sideways and backwards =
+    "charging knight" (T),
+  li Queen = rook forward and sideways + knight forward + king = "colonel" (L).
 
 figure.diagram-container
   .diagram.diag12
-    | fen:8/8/8/3d4/8/8/8/8 a8,b7,c6,e4,f3,g2,h1,c4,b3,a2,e6,f7,g8,f5,d3,b5,d7:
+    | fen:8/8/8/3i4/8/8/8/8 c7,c3,e7,e3,c4,c6,e6,e4:
   .diagram.diag22
-    | fen:8/8/8/4h3/8/8/8/8 e6,f5,e4,d5,c7,g7,g3,c3:
+    | fen:8/8/8/4T3/8/8/8/8 c6,d7,f7,g6,d5,f5,d4,e4,f4:
   figcaption.
-    Moves of the black rook on the left, and of the black knight on the right.
+    Moves of the Fibnif on the left, and of the Charging knight on the right.
+
+h3 The Remarkable Rookies
+
+figure.showPieces.text-center
+  img(src="/images/pieces/Cwda/bs.svg")
+  img(src="/images/pieces/Cwda/wy.svg")
+  img(src="/images/pieces/Cwda/bh.svg")
+  img(src="/images/pieces/Cwda/wo.svg")
+
+ul
+  li Rook = rook limited to 4 squares = "short rook" (S),
+  li Knight = dabbabah + wazir = "woody rook" (Y),
+  li Bishop = dabbabah + ferz + L3 = "half-duck" (H),
+  li Queen = rook + knight = "chancellor" (O).
 
 figure.diagram-container
   .diagram.diag12
-    | fen:8/8/8/3a4/8/8/8/8 c6,b7,e6,f7,e4,f3,c4,b3,d7,f5,d3,b5:
+    | fen:8/8/8/3y4/8/8/8/8 d3,b5,d7,f5,c5,d6,e5,d4:
   .diagram.diag22
-    | fen:8/8/8/4s3/8/8/8/8 a1,b2,c3,d4,f6,g7,h8,b8,c7,d6,f4,g3,h2,c6,d7,f7,g6,g4,f3,d3,c4:
+    | fen:8/8/8/4H3/8/8/8/8 c5,e7,g5,e3,b5,e8,h5,e2,d4,d6,f6,f4:
   figcaption.
-    Moves of the black bishop on the left, and of the black queen on the right.
+    Moves of the Woody rook on the left, and of the Half-duck on the right.
 
-p Pawns can be promoted into any piece (including those of the other team).
+h3 Fide army
 
-p.
-  When castling large, the black king arrives on b8 and the a8 rook moves
-  to c8, to remain on the same color.
+p The standard chess pieces.
 
 h3 Source
 
 p
-  a(href="https://www.chessvariants.com/d.betza/chessvar/dan/colclob.html")
-    | The colorbound clobberers
+  a(href="https://www.chessvariants.com/unequal.dir/cwda.html")
+    | Chess with different armies
   | &nbsp;on chessvariants.com.
 
 p Inventor: Ralph Betza (1996)
diff --git a/client/src/translations/rules/Cwda/es.pug b/client/src/translations/rules/Cwda/es.pug
index bb3cf20d..a5b5ac85 100644
--- a/client/src/translations/rules/Cwda/es.pug
+++ b/client/src/translations/rules/Cwda/es.pug
@@ -1,50 +1,109 @@
 p.boxed
-  | Las piezas negras son reemplazadas por un nuevo equipo, que incluye
-  | la mayoría de las piezas se estiraron para evolucionar en un solo color.
+  | Las piezas blancas y negras son reemplazadas por diferentes ejércitos.
 
 p.
-  Los peones negros y el rey mantienen sus movimientos habituales, pero este
-  no es el caso para las otras piezas:
+  Los peones y los reyes se mueven como de costumbre, pero normalmente no
+  las otras piezas. De hecho, antes del inicio del juego debes
+  seleccionar dos ejércitos, definiendo nuevos movimientos para los
+  "torres", "caballos", "alfiles" y "damas".
+
+p Los movimientos de las piezas se describen utilizando estas piezas básicas:
 ul
-  li Torre = alfil + dabbabah (D),
-  li Caballo = wazir + alfil = "phoenix" (H),
-  li Alfil = ferz + elefante + dabbabah (A),
-  li Dama = alfil + caballo = "princesa" (S).
+  li Dabbabah = saltar dos casillas ortogonalmente
+  li Alfil_A = saltar dos casillas en diagonal
+  li Wazir = una casilla ortogonalmente
+  li Ferz = una casilla diagonal
+  li Three leaper (L3) = saltar tres casillas ortogonalmente
+  li Narrow knight = Caballo sin "movimientos laterales 2+1"
+
+p.
+  Los peones pueden promocionarse en una pieza de cualquier
+  cuál de los ejércitos presentes.
+
+h3 Los Batidores Unicolor
+
+figure.showPieces.text-center
+  img(src="/images/pieces/Cwda/bd.svg")
+  img(src="/images/pieces/Cwda/ww.svg")
+  img(src="/images/pieces/Cwda/bf.svg")
+  img(src="/images/pieces/Cwda/wc.svg")
+
+ul
+  li Torre = alfil_A + dabbabah = "bede" (D),
+  li Caballo = wazir + alfil = "gofre" (W),
+  li Alfil = ferz + alfil_A + dabbabah = "fad" (F),
+  li Dama = alfil + caballo = "cardenal" (C).
+
+figure.diagram-container
+  .diagram.diag12
+    | fen:8/8/8/3D4/8/8/8/8 a8,b7,c6,e4,f3,g2,h1,c4,b3,a2,e6,f7,g8,f5,d3,b5,d7:
+  .diagram.diag22
+    | fen:8/8/8/4w3/8/8/8/8 e6,f5,e4,d5,c7,g7,g3,c3:
+  figcaption Jugadas del Bede a la izquierda y del Gofre a la derecha.
+
 p.
-  El Ferz y el Wazir viajan respectivamente como un alfil y una torre,
-  pero de una casilla solamente. El Elefante y el Dabbabah se mueven
-  respectivamente de dos casillas como un alfil y una torre,
-  posiblemente saltando sobre una pieza.
+  Después del gran enroque, el rey y la torre llegan respectivamente en b1/b8
+  y c1/c8 para que la torre permanezca al mismo color.
+
+h3 Los Caballeros Locos
+
+figure.showPieces.text-center
+  img(src="/images/pieces/Cwda/bg.svg")
+  img(src="/images/pieces/Cwda/wi.svg")
+  img(src="/images/pieces/Cwda/bt.svg")
+  img(src="/images/pieces/Cwda/wl.svg")
+
+ul
+  li.
+    Torre = torre hacia adelante y hacia los lados + rey atrás =
+    "torre de carga" (G),
+  li Caballo = narrow knight + ferz = "fibnif" (I),
+  li.
+    Alfil = caballo hacia adelante + rey lateralmente y hacia atrás =
+    "caballo de carga" (T),
+  li.
+    Dama = torre hacia adelante y hacia los lados + caballo hacia adelante
+    + rey = "coronel" (L).
 
 figure.diagram-container
   .diagram.diag12
-    | fen:8/8/8/3d4/8/8/8/8 a8,b7,c6,e4,f3,g2,h1,c4,b3,a2,e6,f7,g8,f5,d3,b5,d7:
+    | fen:8/8/8/3i4/8/8/8/8 c7,c3,e7,e3,c4,c6,e6,e4:
   .diagram.diag22
-    | fen:8/8/8/4h3/8/8/8/8 e6,f5,e4,d5,c7,g7,g3,c3:
+    | fen:8/8/8/4T3/8/8/8/8 c6,d7,f7,g6,d5,f5,d4,e4,f4:
   figcaption.
-    Jugadas de la torre negra a la izquierda y del caballo negro a la derecha.
+    Jugadas del Fibnif a la izquierda, y del Caballo de carga a la derecha.
+
+h3 Las Reclutas Notables
+
+figure.showPieces.text-center
+  img(src="/images/pieces/Cwda/bs.svg")
+  img(src="/images/pieces/Cwda/wy.svg")
+  img(src="/images/pieces/Cwda/bh.svg")
+  img(src="/images/pieces/Cwda/wo.svg")
+
+ul
+  li Torre = torre limitada a 4 casillas = "torre corta" (S),
+  li Caballo = dabbabah + wazir = "torre arbolada" (Y),
+  li Alfil = dabbabah + ferz + L3 = "medio-pato" (H),
+  li Dama = torre + caballo = "canciller" (O).
 
 figure.diagram-container
   .diagram.diag12
-    | fen:8/8/8/3a4/8/8/8/8 c6,b7,e6,f7,e4,f3,c4,b3,d7,f5,d3,b5:
+    | fen:8/8/8/3y4/8/8/8/8 d3,b5,d7,f5,c5,d6,e5,d4:
   .diagram.diag22
-    | fen:8/8/8/4s3/8/8/8/8 a1,b2,c3,d4,f6,g7,h8,b8,c7,d6,f4,g3,h2,c6,d7,f7,g6,g4,f3,d3,c4:
+    | fen:8/8/8/4H3/8/8/8/8 c5,e7,g5,e3,b5,e8,h5,e2,d4,d6,f6,f4:
   figcaption.
-    Jugadas del alfil negro a la izquierda, y de la dama negra a la derecha.
+    Jugadas de la Torre arbolada a la izquierda y del Medio-pato a la derecha.
 
-p.
-  Los peones pueden ser promovidos a cualquier piezas (incluidos las del
-  otro equipo)
+h3 Ejército Fide
 
-p.
-  Después del gran enroque, el rey negro llega en b8 y la torre a8 entra en c8,
-  para permanecer en el mismo color.
+p Piezas de ajedrez estándar.
 
 h3 Fuente
 
 p
-  a(href="https://www.chessvariants.com/d.betza/chessvar/dan/colclob.html")
-    | Los "batidores unicolor"
+  a(href="https://www.chessvariants.com/unequal.dir/cwda.html")
+    | Ajedrez con diferentes ejércitos.
   | &nbsp;en chessvariants.com.
 
 p Inventor: Ralph Betza (1996)
diff --git a/client/src/translations/rules/Cwda/fr.pug b/client/src/translations/rules/Cwda/fr.pug
index 4d5a82b3..53e51d8d 100644
--- a/client/src/translations/rules/Cwda/fr.pug
+++ b/client/src/translations/rules/Cwda/fr.pug
@@ -1,50 +1,107 @@
 p.boxed
-  | Les pièces noires sont remplacées par une nouvelle équipe, dont
-  | la plupart des pièces tendent à évoluer sur une seule couleur.
+  | Les pièces noires et blanches sont remplacées par des armées différentes.
 
 p.
-  Les pions et le roi noirs conservent leur déplacements habituels, mais ce
-  n'est pas le cas des autres pièces :
+  Les pions et rois se déplacent comme d'habitude, mais en général pas
+  les autres pièces. En effet, avant le début de la partie vous devez
+  sélectionner deux armées, définissant de nouveaux déplacements pour les
+  "tours", "cavaliers", "fous" et "dames".
+
+p Les mouvements des pièces sont décrits en utilisant ces pièces élmentaires :
 ul
-  li Tour = fou + dabbabah (D),
-  li Cavalier = wazir + alfil = "phoenix" (H),
-  li Fou = ferz + alfil + dabbabah (A),
-  li Dame = fou + cavalier = "princesse" (S).
+  li Dabbabah = saute deux cases orthogonalement
+  li Alfil = saute deux cases en diagonale
+  li Wazir = une case orthogonalement
+  li Ferz = une case en diagonale
+  li Three leaper (L3) = saute trois cases orthogonalement
+  li Narrow knight = cavalier sans "coups latéraux 2+1"
+
+p.
+  Les pions peuvent se promouvoir en une pièce de n'importe
+  laquelle des armées présentes.
+
+h3 Les Tabasseurs Unicolores
+
+figure.showPieces.text-center
+  img(src="/images/pieces/Cwda/bd.svg")
+  img(src="/images/pieces/Cwda/ww.svg")
+  img(src="/images/pieces/Cwda/bf.svg")
+  img(src="/images/pieces/Cwda/wc.svg")
+
+ul
+  li Tour = fou + dabbabah = "bede" (D),
+  li Cavalier = wazir + alfil = "gaufre" (W),
+  li Fou = ferz + alfil + dabbabah = "fad" (F),
+  li Dame = fou + cavalier = "cardinal" (C).
+
+figure.diagram-container
+  .diagram.diag12
+    | fen:8/8/8/3D4/8/8/8/8 a8,b7,c6,e4,f3,g2,h1,c4,b3,a2,e6,f7,g8,f5,d3,b5,d7:
+  .diagram.diag22
+    | fen:8/8/8/4w3/8/8/8/8 e6,f5,e4,d5,c7,g7,g3,c3:
+  figcaption Coups du Bede à gauche, et de la Gaufre à droite.
+
 p.
-  Le Ferz et le Wazir se déplacent respectivement comme un fou et une tour
-  mais d'une seule case. L'Alfil et le Dabbabah se déplacent respectivement
-  de deux cases comme un fou et une tour,
-  en sautant éventuellement par dessus une pièce.
+  Après le grand roque, roi et tour arrivent respectivement en b1/b8 et c1/c8
+  afin que la tour reste sur la même couleur.
+
+h3 Les Chevaliers Fous
+
+figure.showPieces.text-center
+  img(src="/images/pieces/Cwda/bg.svg")
+  img(src="/images/pieces/Cwda/wi.svg")
+  img(src="/images/pieces/Cwda/bt.svg")
+  img(src="/images/pieces/Cwda/wl.svg")
+
+ul
+  li.
+    Tour = tour vers l'avant et latéralement + roi vers l'arrière =
+    "tour chargeante" (G),
+  li Cavalier = narrow knight + ferz = "fibnif" (I),
+  li.
+    Fou = cavalier vers l'avant + roi latéralement et vers l'arrière =
+    "cavalier chargeant" (T),
+  li.
+    Dame = tour vers l'avant et latéralement + cavalier vers l'avant + roi =
+    "colonel" (L).
 
 figure.diagram-container
   .diagram.diag12
-    | fen:8/8/8/3d4/8/8/8/8 a8,b7,c6,e4,f3,g2,h1,c4,b3,a2,e6,f7,g8,f5,d3,b5,d7:
+    | fen:8/8/8/3i4/8/8/8/8 c7,c3,e7,e3,c4,c6,e6,e4:
   .diagram.diag22
-    | fen:8/8/8/4h3/8/8/8/8 e6,f5,e4,d5,c7,g7,g3,c3:
-  figcaption.
-    Coups de la tour noire à gauche, et du cavalier noir à droite.
+    | fen:8/8/8/4T3/8/8/8/8 c6,d7,f7,g6,d5,f5,d4,e4,f4:
+  figcaption Coups du Fibnif à gauche, et du Cavalier chargeant à droite.
+
+h3 Les Recrues Remarquables
+
+figure.showPieces.text-center
+  img(src="/images/pieces/Cwda/bs.svg")
+  img(src="/images/pieces/Cwda/wy.svg")
+  img(src="/images/pieces/Cwda/bh.svg")
+  img(src="/images/pieces/Cwda/wo.svg")
+
+ul
+  li Tour = tour limitée à 4 cases = "tour courte" (S),
+  li Cavalier = dabbabah + wazir = "tour boisée" (Y),
+  li Fou = dabbabah + ferz + L3 = "demi-canard" (H),
+  li Dame = tour + cavalier = "chancelier" (O).
 
 figure.diagram-container
   .diagram.diag12
-    | fen:8/8/8/3a4/8/8/8/8 c6,b7,e6,f7,e4,f3,c4,b3,d7,f5,d3,b5:
+    | fen:8/8/8/3y4/8/8/8/8 d3,b5,d7,f5,c5,d6,e5,d4:
   .diagram.diag22
-    | fen:8/8/8/4s3/8/8/8/8 a1,b2,c3,d4,f6,g7,h8,b8,c7,d6,f4,g3,h2,c6,d7,f7,g6,g4,f3,d3,c4:
-  figcaption.
-    Coups du fou noir à gauche, et de la dame noire à droite.
+    | fen:8/8/8/4H3/8/8/8/8 c5,e7,g5,e3,b5,e8,h5,e2,d4,d6,f6,f4:
+  figcaption Coups de la Tour boisée à gauche, et du Demi-canard à droite.
 
-p.
-  Les pions peuvent être promus en n'importe quelle pièce (incluant celles
-  de l'autre équipe).
+h3 Armée Fide
 
-p.
-  Après le grand roque, le roi noir arrive en b8 et la tour a8 vient en c8,
-  afin de rester sur la même couleur.
+p Les pièces d'échecs standard.
 
 h3 Source
 
 p
-  a(href="https://www.chessvariants.com/d.betza/chessvar/dan/colclob.html")
-    | Les "tabasseurs unicolores"
-    | &nbsp;sur chessvariants.com.
+  a(href="https://www.chessvariants.com/unequal.dir/cwda.html")
+    | Échecs avec armées différentes
+  | &nbsp;sur chessvariants.com.
 
 p Inventeur : Ralph Betza (1996)
diff --git a/client/src/variants/Absorption.js b/client/src/variants/Absorption.js
index 33c83517..293238db 100644
--- a/client/src/variants/Absorption.js
+++ b/client/src/variants/Absorption.js
@@ -116,7 +116,7 @@ export class AbsorptionRules extends ChessRules {
     return (
       this.isAttackedBySlideNJump(sq, color, V.BN, V.steps[V.BISHOP]) ||
       this.isAttackedBySlideNJump(
-        sq, color, V.BN, V.steps[V.KNIGHT], "oneStep")
+        sq, color, V.BN, V.steps[V.KNIGHT], 1)
     );
   }
 
@@ -124,7 +124,7 @@ export class AbsorptionRules extends ChessRules {
     return (
       this.isAttackedBySlideNJump(sq, color, V.RN, V.steps[V.ROOK]) ||
       this.isAttackedBySlideNJump(
-        sq, color, V.RN, V.steps[V.KNIGHT], "oneStep")
+        sq, color, V.RN, V.steps[V.KNIGHT], 1)
     );
   }
 
@@ -133,7 +133,7 @@ export class AbsorptionRules extends ChessRules {
       this.isAttackedBySlideNJump(
         sq, color, V.QN, V.steps[V.BISHOP].concat(V.steps[V.ROOK])) ||
       this.isAttackedBySlideNJump(
-        sq, color, V.QN, V.steps[V.KNIGHT], "oneStep")
+        sq, color, V.QN, V.steps[V.KNIGHT], 1)
     );
   }
 
diff --git a/client/src/variants/Alapo.js b/client/src/variants/Alapo.js
index 3037954e..2d2a7900 100644
--- a/client/src/variants/Alapo.js
+++ b/client/src/variants/Alapo.js
@@ -34,16 +34,14 @@ export class AlapoRules extends ChessRules {
   }
 
   getPotentialMinirookMoves(sq) {
-    return super.getSlideNJumpMoves(sq, V.steps[V.ROOK], "oneStep");
+    return super.getSlideNJumpMoves(sq, V.steps[V.ROOK], 1);
   }
   getPotentialMinibishopMoves(sq) {
-    return super.getSlideNJumpMoves(sq, V.steps[V.BISHOP], "oneStep");
+    return super.getSlideNJumpMoves(sq, V.steps[V.BISHOP], 1);
   }
   getPotentialMiniqueenMoves(sq) {
-    return (
-      super.getSlideNJumpMoves(
-        sq, V.steps[V.ROOK].concat(V.steps[V.BISHOP]), "oneStep")
-    );
+    return super.getSlideNJumpMoves(
+      sq, V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
   }
 
   getPotentialMovesFrom(sq) {
@@ -68,8 +66,8 @@ export class AlapoRules extends ChessRules {
     return "Alapo/" + b + suffix;
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
+  static GenRandInitFen(options) {
+    if (options.randomness == 0)
       return "rbqqbr/tcssct/6/6/TCSSCT/RBQQBR w 0";
 
     const piece2pawn = {
@@ -81,7 +79,7 @@ export class AlapoRules extends ChessRules {
     let pieces = { w: new Array(6), b: new Array(6) };
     // Shuffle pieces on first (and last rank if randomness == 2)
     for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
+      if (c == 'b' && options.randomness == 1) {
         pieces['b'] = pieces['w'];
         break;
       }
diff --git a/client/src/variants/Align4.js b/client/src/variants/Align4.js
index fb438717..47f0092a 100644
--- a/client/src/variants/Align4.js
+++ b/client/src/variants/Align4.js
@@ -2,8 +2,21 @@ import { ChessRules, Move, PiPo } from "@/base_rules";
 
 export class Align4Rules extends ChessRules {
 
-  static GenRandInitFen(randomness) {
-    const baseFen = ChessRules.GenRandInitFen(Math.min(randomness, 1));
+  static get Options() {
+    return {
+      check: [
+        {
+          label: "Random",
+          defaut: false,
+          variable: "random"
+        }
+      ]
+    };
+  }
+
+  static GenRandInitFen(options) {
+    const baseFen = ChessRules.GenRandInitFen(
+      { randomness: (options.random ? 1 : 0) });
     return "4k3/8" + baseFen.substring(17, 50) + " -";
   }
 
@@ -80,10 +93,7 @@ export class Align4Rules extends ChessRules {
     if (this.getColor(x, y) == 'w') return super.getPotentialKingMoves([x, y]);
     // Black doesn't castle:
     return super.getSlideNJumpMoves(
-      [x, y],
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-      "oneStep"
-    );
+      [x, y], V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
   }
 
   getAllValidMoves() {
diff --git a/client/src/variants/Allmate.js b/client/src/variants/Allmate.js
index 86409c25..9c43a46c 100644
--- a/client/src/variants/Allmate.js
+++ b/client/src/variants/Allmate.js
@@ -11,8 +11,8 @@ export class AllmateRules extends ChessRules {
     return [];
   }
 
-  static GenRandInitFen(randomness) {
-    return ChessRules.GenRandInitFen(randomness).slice(0, -2);
+  static GenRandInitFen(options) {
+    return ChessRules.GenRandInitFen(options).slice(0, -2);
   }
 
   getPotentialMovesFrom([x, y]) {
@@ -69,10 +69,7 @@ export class AllmateRules extends ChessRules {
                 case V.KING:
                   // Do not allow castling to escape from check
                   oppMoves = super.getSlideNJumpMoves(
-                    [i, j],
-                    V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-                    "oneStep"
-                  );
+                    [i, j], V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
                   break;
               }
               for (let om of oppMoves) {
diff --git a/client/src/variants/Ambiguous.js b/client/src/variants/Ambiguous.js
index b478887d..5e2b32a7 100644
--- a/client/src/variants/Ambiguous.js
+++ b/client/src/variants/Ambiguous.js
@@ -232,13 +232,13 @@ export class AmbiguousRules extends ChessRules {
       this.kingPos[this.turn] = [move.vanish[1].x, move.vanish[1].y];
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
+  static GenRandInitFen(options) {
+    if (options.randomness == 0)
       return "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w 0 -";
 
     let pieces = { w: new Array(8), b: new Array(8) };
     for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
+      if (c == 'b' && options.randomness == 1) {
         pieces['b'] = pieces['w'];
         break;
       }
diff --git a/client/src/variants/Antiking1.js b/client/src/variants/Antiking1.js
index 92034a30..781984f9 100644
--- a/client/src/variants/Antiking1.js
+++ b/client/src/variants/Antiking1.js
@@ -5,6 +5,10 @@ import { randInt } from "@/utils/alea";
 
 export class Antiking1Rules extends BerolinaRules {
 
+  static get Options() {
+    return null;
+  }
+
   static get PawnSpecs() {
     return Object.assign(
       {},
@@ -132,10 +136,7 @@ export class Antiking1Rules extends BerolinaRules {
   getPotentialAntikingMoves(sq) {
     // The antiking moves like a king (only captured colors differ)
     return this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-      "oneStep"
-    );
+      sq, V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
   }
 
   isAttacked(sq, color) {
@@ -149,24 +150,14 @@ export class Antiking1Rules extends BerolinaRules {
     // Antiking is not attacked by king:
     if (this.getPiece(x, y) == V.ANTIKING) return false;
     return this.isAttackedBySlideNJump(
-      [x, y],
-      color,
-      V.KING,
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-      "oneStep"
-    );
+      [x, y], color, V.KING, V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
   }
 
   isAttackedByAntiking([x, y], color) {
     // (Anti)King is not attacked by antiking
     if ([V.KING, V.ANTIKING].includes(this.getPiece(x, y))) return false;
     return this.isAttackedBySlideNJump(
-      [x, y],
-      color,
-      V.ANTIKING,
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-      "oneStep"
-    );
+      [x, y], color, V.ANTIKING, V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
   }
 
   underCheck(color) {
diff --git a/client/src/variants/Antiking2.js b/client/src/variants/Antiking2.js
index df764583..fa0bbcc4 100644
--- a/client/src/variants/Antiking2.js
+++ b/client/src/variants/Antiking2.js
@@ -79,10 +79,7 @@ export class Antiking2Rules extends ChessRules {
   getPotentialAntikingMoves(sq) {
     // The antiking moves like a king (only captured colors differ)
     return this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-      "oneStep"
-    );
+      sq, V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
   }
 
   isAttacked(sq, color) {
@@ -102,12 +99,7 @@ export class Antiking2Rules extends ChessRules {
     // (Anti)King is not attacked by antiking
     if ([V.KING, V.ANTIKING].includes(this.getPiece(x, y))) return false;
     return this.isAttackedBySlideNJump(
-      [x, y],
-      color,
-      V.ANTIKING,
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-      "oneStep"
-    );
+      [x, y], color, V.ANTIKING, V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
   }
 
   underCheck(color) {
@@ -154,15 +146,15 @@ export class Antiking2Rules extends ChessRules {
     );
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
+  static GenRandInitFen(options) {
+    if (options.randomness == 0)
       return "rnbqkbnr/pppppppp/3A4/8/8/3a4/PPPPPPPP/RNBQKBNR w 0 ahah -";
 
     let pieces = { w: new Array(8), b: new Array(8) };
     let flags = "";
     let antikingPos = { w: -1, b: -1 };
     for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
+      if (c == 'b' && options.randomness == 1) {
         pieces['b'] = pieces['w'];
         antikingPos['b'] = antikingPos['w'];
         flags += flags;
diff --git a/client/src/variants/Apocalypse.js b/client/src/variants/Apocalypse.js
index e817296a..fc309155 100644
--- a/client/src/variants/Apocalypse.js
+++ b/client/src/variants/Apocalypse.js
@@ -3,6 +3,10 @@ import { randInt } from "@/utils/alea";
 
 export class ApocalypseRules extends ChessRules {
 
+  static get Options() {
+    return null;
+  }
+
   static get PawnSpecs() {
     return Object.assign(
       {},
diff --git a/client/src/variants/Arena.js b/client/src/variants/Arena.js
index 285dd4c8..880f0082 100644
--- a/client/src/variants/Arena.js
+++ b/client/src/variants/Arena.js
@@ -2,6 +2,13 @@ import { ChessRules } from "@/base_rules";
 
 export class ArenaRules extends ChessRules {
 
+  static get Lines() {
+    return [
+      [[2, 0], [2, 8]],
+      [[6, 0], [6, 8]]
+    ];
+  }
+
   static get HasFlags() {
     return false;
   }
@@ -45,8 +52,8 @@ export class ArenaRules extends ChessRules {
 
   scanKings() {}
 
-  static GenRandInitFen(randomness) {
-    return ChessRules.GenRandInitFen(randomness).slice(0, -6) + "-";
+  static GenRandInitFen(options) {
+    return ChessRules.GenRandInitFen(options).slice(0, -6) + "-";
   }
 
   static InArena(x) {
@@ -69,27 +76,13 @@ export class ArenaRules extends ChessRules {
   }
 
   getPotentialQueenMoves(sq) {
-    return this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP])
-    ).filter(m => {
-      // Filter out moves longer than 3 squares
-      return Math.max(
-        Math.abs(m.end.x - m.start.x),
-        Math.abs(m.end.y - m.start.y)) <= 3;
-    });
+    return super.getSlideNJumpMoves(
+      sq, V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 3);
   }
 
   getPotentialKingMoves(sq) {
-    return this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP])
-    ).filter(m => {
-      // Filter out moves longer than 3 squares
-      return Math.max(
-        Math.abs(m.end.x - m.start.x),
-        Math.abs(m.end.y - m.start.y)) <= 3;
-    });
+    return super.getSlideNJumpMoves(
+      sq, V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 3);
   }
 
   getCheckSquares() {
diff --git a/client/src/variants/Atarigo.js b/client/src/variants/Atarigo.js
index f2c84a89..07e9e67d 100644
--- a/client/src/variants/Atarigo.js
+++ b/client/src/variants/Atarigo.js
@@ -4,6 +4,10 @@ import { ArrayFun } from "@/utils/array";
 
 export class AtarigoRules extends ChessRules {
 
+  static get Options() {
+    return null;
+  }
+
   static get Monochrome() {
     return true;
   }
diff --git a/client/src/variants/Avalam2.js b/client/src/variants/Avalam2.js
index 6c39e94c..c05b4d92 100644
--- a/client/src/variants/Avalam2.js
+++ b/client/src/variants/Avalam2.js
@@ -3,6 +3,10 @@ import { randInt } from "@/utils/alea";
 
 export class Avalam2Rules extends ChessRules {
 
+  static get Options() {
+    return null;
+  }
+
   static get HasFlags() {
     return false;
   }
diff --git a/client/src/variants/Avalanche.js b/client/src/variants/Avalanche.js
index 17e21380..40a43938 100644
--- a/client/src/variants/Avalanche.js
+++ b/client/src/variants/Avalanche.js
@@ -340,6 +340,7 @@ export class AvalancheRules extends ChessRules {
       this.play(moves[3]); //HACK... 3 = queen index
       const res = this.getComputerMove();
       this.undo(moves[3]);
+      if (Array.isArray(res)) return [moves[3]].concat(res);
       return [moves[3], res];
     }
     // subTurn == 1 (necessarily)
diff --git a/client/src/variants/Balaklava.js b/client/src/variants/Balaklava.js
index 835aa965..6a38a51c 100644
--- a/client/src/variants/Balaklava.js
+++ b/client/src/variants/Balaklava.js
@@ -46,11 +46,10 @@ export class BalaklavaRules extends ChessRules {
     );
   }
 
-  static GenRandInitFen(randomness) {
+  static GenRandInitFen(options) {
     // No collision between 'n' and castle flags, so next replacement is fine
     return (
-      ChessRules.GenRandInitFen(randomness)
-        .replace(/n/g, 'm').replace(/N/g, 'M')
+      ChessRules.GenRandInitFen(options).replace(/n/g, 'm').replace(/N/g, 'M')
     );
   }
 
@@ -90,7 +89,7 @@ export class BalaklavaRules extends ChessRules {
   }
 
   getPotentialMammothMoves(sq) {
-    return this.getSlideNJumpMoves(sq, V.steps[V.MAMMOTH], "oneStep");
+    return this.getSlideNJumpMoves(sq, V.steps[V.MAMMOTH], 1);
   }
 
   isAttacked(sq, color) {
@@ -101,10 +100,8 @@ export class BalaklavaRules extends ChessRules {
   }
 
   isAttackedByMammoth(sq, color) {
-    return (
-      this.isAttackedBySlideNJump(
-        sq, color, V.MAMMOTH, V.steps[V.MAMMOTH], "oneStep")
-    );
+    return this.isAttackedBySlideNJump(
+      sq, color, V.MAMMOTH, V.steps[V.MAMMOTH], 1);
   }
 
   static get SEARCH_DEPTH() {
diff --git a/client/src/variants/Ball.js b/client/src/variants/Ball.js
index 8f6493a3..47689757 100644
--- a/client/src/variants/Ball.js
+++ b/client/src/variants/Ball.js
@@ -186,13 +186,13 @@ export class BallRules extends ChessRules {
     );
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
+  static GenRandInitFen(options) {
+    if (options.randomness == 0)
       return "hbnrqrnhb/ppppppppp/9/9/4a4/9/9/PPPPPPPPP/HBNRQRNHB w 0 - -";
 
     let pieces = { w: new Array(9), b: new Array(9) };
     for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
+      if (c == 'b' && options.randomness == 1) {
         pieces['b'] = pieces['w'];
         break;
       }
@@ -411,28 +411,13 @@ export class BallRules extends ChessRules {
     return moves;
   }
 
-  // "Sliders": at most 3 steps
-  getSlideNJumpMoves([x, y], steps, oneStep) {
-    let moves = [];
-    outerLoop: for (let step of steps) {
-      let i = x + step[0];
-      let j = y + step[1];
-      let stepCount = 1;
-      while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
-        moves.push(this.getBasicMove([x, y], [i, j]));
-        if (oneStep || stepCount == 3) continue outerLoop;
-        i += step[0];
-        j += step[1];
-        stepCount++;
-      }
-      if (V.OnBoard(i, j) && this.canTake([x, y], [i, j]))
-        moves.push(this.getBasicMove([x, y], [i, j]));
-    }
-    return moves;
+  getSlideNJumpMoves(sq, steps, nbSteps) {
+    // "Sliders": at most 3 steps
+    return super.getSlideNJumpMoves(sq, steps, !nbSteps ? 3 : 1);
   }
 
   getPotentialPhoenixMoves(sq) {
-    return this.getSlideNJumpMoves(sq, V.steps[V.PHOENIX], "oneStep");
+    return super.getSlideNJumpMoves(sq, V.steps[V.PHOENIX], 1);
   }
 
   getPmove(move) {
diff --git a/client/src/variants/Bario.js b/client/src/variants/Bario.js
index 3564e748..3e076658 100644
--- a/client/src/variants/Bario.js
+++ b/client/src/variants/Bario.js
@@ -4,6 +4,10 @@ import { randInt } from "@/utils/alea";
 
 export class BarioRules extends ChessRules {
 
+  static get Options() {
+    return null;
+  }
+
   // Does not really seem necessary (although the author mention it)
   // Instead, first move = pick a square for the king.
   static get HasFlags() {
diff --git a/client/src/variants/Baroque.js b/client/src/variants/Baroque.js
index 063b1822..7abb77d4 100644
--- a/client/src/variants/Baroque.js
+++ b/client/src/variants/Baroque.js
@@ -107,23 +107,11 @@ export class BaroqueRules extends ChessRules {
     }
   }
 
-  getSlideNJumpMoves([x, y], steps, oneStep) {
-    const piece = this.getPiece(x, y);
-    let moves = [];
-    outerLoop: for (let step of steps) {
-      let i = x + step[0];
-      let j = y + step[1];
-      while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
-        moves.push(this.getBasicMove([x, y], [i, j]));
-        if (oneStep !== undefined) continue outerLoop;
-        i += step[0];
-        j += step[1];
-      }
-      // Only king can take on occupied square:
-      if (piece == V.KING && V.OnBoard(i, j) && this.canTake([x, y], [i, j]))
-        moves.push(this.getBasicMove([x, y], [i, j]));
-    }
-    return moves;
+  canTake([x1, y1], [x2, y2]) {
+    return (
+      this.getPiece(x1, y1) == V.KING &&
+      this.getColor(x1, y1) != this.getColor(x2, y2)
+    );
   }
 
   // Modify capturing moves among listed pawn moves
@@ -531,15 +519,15 @@ export class BaroqueRules extends ChessRules {
     return false;
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
+  static GenRandInitFen(options) {
+    if (options.randomness == 0)
       // Deterministic:
       return "rnbkqbnm/pppppppp/8/8/8/8/PPPPPPPP/MNBQKBNR w 0";
 
     let pieces = { w: new Array(8), b: new Array(8) };
     // Shuffle pieces on first and last rank
     for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
+      if (c == 'b' && options.randomness == 1) {
         pieces['b'] = pieces['w'];
         break;
       }
diff --git a/client/src/variants/Benedict.js b/client/src/variants/Benedict.js
index 40d7a091..5584fb87 100644
--- a/client/src/variants/Benedict.js
+++ b/client/src/variants/Benedict.js
@@ -14,22 +14,8 @@ export class BenedictRules extends ChessRules {
     );
   }
 
-  // TODO(?): some duplicated code in 2 next functions
-  getSlideNJumpMoves([x, y], steps, oneStep) {
-    let moves = [];
-    outerLoop: for (let loop = 0; loop < steps.length; loop++) {
-      const step = steps[loop];
-      let i = x + step[0];
-      let j = y + step[1];
-      while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
-        moves.push(this.getBasicMove([x, y], [i, j]));
-        if (oneStep) continue outerLoop;
-        i += step[0];
-        j += step[1];
-      }
-      // No capture check: handled elsewhere (next method)
-    }
-    return moves;
+  canTake() {
+    return false;
   }
 
   // Find possible captures from a square
diff --git a/client/src/variants/Bicolour.js b/client/src/variants/Bicolour.js
index 795f4ba4..c426b811 100644
--- a/client/src/variants/Bicolour.js
+++ b/client/src/variants/Bicolour.js
@@ -14,8 +14,8 @@ export class BicolourRules extends ChessRules {
     );
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
+  static GenRandInitFen(options) {
+    if (options.randomness == 0)
       return "rqbnkbnr/pppppppp/8/8/8/8/PPPPPPPP/RQBNKBNR w 0 -";
 
     // Place pieces at random but the king cannot be next to a rook or queen.
@@ -23,7 +23,7 @@ export class BicolourRules extends ChessRules {
     let pieces = { w: new Array(8), b: new Array(8) };
     let flags = "";
     for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
+      if (c == 'b' && options.randomness == 1) {
         pieces['b'] = pieces['w'];
         break;
       }
diff --git a/client/src/variants/Bishopawns.js b/client/src/variants/Bishopawns.js
index feecd458..57a6051a 100644
--- a/client/src/variants/Bishopawns.js
+++ b/client/src/variants/Bishopawns.js
@@ -2,6 +2,10 @@ import { ChessRules } from "@/base_rules";
 
 export class BishopawnsRules extends ChessRules {
 
+  static get Options() {
+    return null;
+  }
+
   static get PawnSpecs() {
     return Object.assign(
       {},
diff --git a/client/src/variants/Capablanca.js b/client/src/variants/Capablanca.js
index ec1e299a..a58263cc 100644
--- a/client/src/variants/Capablanca.js
+++ b/client/src/variants/Capablanca.js
@@ -51,13 +51,13 @@ export class CapablancaRules extends ChessRules {
 
   getPotentialEmpressMoves(sq) {
     return this.getSlideNJumpMoves(sq, V.steps[V.ROOK]).concat(
-      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep")
+      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], 1)
     );
   }
 
   getPotentialPrincessMoves(sq) {
     return this.getSlideNJumpMoves(sq, V.steps[V.BISHOP]).concat(
-      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep")
+      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], 1)
     );
   }
 
@@ -72,26 +72,14 @@ export class CapablancaRules extends ChessRules {
   isAttackedByEmpress(sq, color) {
     return (
       this.isAttackedBySlideNJump(sq, color, V.EMPRESS, V.steps[V.ROOK]) ||
-      this.isAttackedBySlideNJump(
-        sq,
-        color,
-        V.EMPRESS,
-        V.steps[V.KNIGHT],
-        "oneStep"
-      )
+      this.isAttackedBySlideNJump(sq, color, V.EMPRESS, V.steps[V.KNIGHT], 1)
     );
   }
 
   isAttackedByPrincess(sq, color) {
     return (
       this.isAttackedBySlideNJump(sq, color, V.PRINCESS, V.steps[V.BISHOP]) ||
-      this.isAttackedBySlideNJump(
-        sq,
-        color,
-        V.PRINCESS,
-        V.steps[V.KNIGHT],
-        "oneStep"
-      )
+      this.isAttackedBySlideNJump(sq, color, V.PRINCESS, V.steps[V.KNIGHT], 1)
     );
   }
 
@@ -106,8 +94,8 @@ export class CapablancaRules extends ChessRules {
     return 2;
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0) {
+  static GenRandInitFen(options) {
+    if (options.randomness == 0) {
       return (
         "rnsbqkbenr/pppppppppp/91/91/91/91/PPPPPPPPPP/RNSBQKBENR w 0 ajaj -"
       );
@@ -116,7 +104,7 @@ export class CapablancaRules extends ChessRules {
     let pieces = { w: new Array(10), b: new Array(10) };
     let flags = "";
     for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
+      if (c == 'b' && options.randomness == 1) {
         pieces['b'] = pieces['w'];
         flags += flags;
         break;
diff --git a/client/src/variants/Chakart.js b/client/src/variants/Chakart.js
index ad584e3d..0042bf1a 100644
--- a/client/src/variants/Chakart.js
+++ b/client/src/variants/Chakart.js
@@ -1149,9 +1149,9 @@ export class ChakartRules extends ChessRules {
     return "*";
   }
 
-  static GenRandInitFen(randomness) {
+  static GenRandInitFen(options) {
     return (
-      SuicideRules.GenRandInitFen(randomness).slice(0, -1) +
+      SuicideRules.GenRandInitFen(options).slice(0, -1) +
       // Add Peach + Mario flags + capture counts
       "1111 000000000000"
     );
diff --git a/client/src/variants/Checkered.js b/client/src/variants/Checkered.js
index 5036a82d..aac3e024 100644
--- a/client/src/variants/Checkered.js
+++ b/client/src/variants/Checkered.js
@@ -2,6 +2,26 @@ import { ChessRules, Move, PiPo } from "@/base_rules";
 
 export class CheckeredRules extends ChessRules {
 
+  static get Options() {
+    return Object.assign(
+      {},
+      ChessRules.Options,
+      {
+        check: [
+          {
+            label: "With switch",
+            defaut: true,
+            variable: "switch"
+          }
+        ]
+      }
+    );
+  }
+
+  static AbbreviateOptions(opts) {
+    return (!opts["switch"] ? "NS" : "");
+  }
+
   static board2fen(b) {
     const checkered_codes = {
       p: "s",
@@ -41,26 +61,6 @@ export class CheckeredRules extends ChessRules {
     return (b[0] == "c" ? "Checkered/" : "") + b;
   }
 
-  static get Options() {
-    return Object.assign(
-      {},
-      ChessRules.Options,
-      {
-        check: [
-          {
-            label: "With switch",
-            defaut: true,
-            variable: "switch"
-          }
-        ]
-      }
-    );
-  }
-
-  static AbbreviateOptions(opts) {
-    return (!opts["switch"] ? "NS" : "");
-  }
-
   setOtherVariables(fen) {
     super.setOtherVariables(fen);
     // Local stack of non-capturing checkered moves:
@@ -433,12 +433,7 @@ export class CheckeredRules extends ChessRules {
 
   isAttackedByKnight(sq, colors) {
     return this.isAttackedBySlideNJump(
-      sq,
-      colors,
-      V.KNIGHT,
-      V.steps[V.KNIGHT],
-      "oneStep"
-    );
+      sq, colors, V.KNIGHT, V.steps[V.KNIGHT], "oneStep");
   }
 
   isAttackedByBishop(sq, colors) {
@@ -448,20 +443,13 @@ export class CheckeredRules extends ChessRules {
 
   isAttackedByQueen(sq, colors) {
     return this.isAttackedBySlideNJump(
-      sq,
-      colors,
-      V.QUEEN,
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP])
-    );
+      sq, colors, V.QUEEN, V.steps[V.ROOK].concat(V.steps[V.BISHOP]));
   }
 
   isAttackedByKing(sq, colors) {
     return this.isAttackedBySlideNJump(
-      sq,
-      colors,
-      V.KING,
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-      "oneStep"
+      sq, colors, V.KING,
+      V.steps[V.ROOK].concat(V.steps[V.BISHOP]), "oneStep"
     );
   }
 
diff --git a/client/src/variants/Chess960.js b/client/src/variants/Chess960.js
index 968ec1c3..8d5cbafc 100644
--- a/client/src/variants/Chess960.js
+++ b/client/src/variants/Chess960.js
@@ -15,8 +15,7 @@ export class Chess960Rules extends ChessRules {
             { label: "Asymmetric random", value: 2 }
           ]
         }
-      ],
-      check: []
+      ]
     };
   }
 
diff --git a/client/src/variants/Circular.js b/client/src/variants/Circular.js
index 47758442..333ad320 100644
--- a/client/src/variants/Circular.js
+++ b/client/src/variants/Circular.js
@@ -35,8 +35,8 @@ export class CircularRules extends ChessRules {
     this.pawnFlags = flags;
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0) {
+  static GenRandInitFen(options) {
+    if (options.randomness == 0) {
       return "8/8/pppppppp/rnbqkbnr/8/8/PPPPPPPP/RNBQKBNR " +
         "w 0 1111111111111111";
     }
@@ -44,7 +44,7 @@ export class CircularRules extends ChessRules {
     let pieces = { w: new Array(8), b: new Array(8) };
     // Shuffle pieces on first and last rank
     for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
+      if (c == 'b' && options.randomness == 1) {
         pieces['b'] = pieces['w'];
         break;
       }
@@ -92,7 +92,7 @@ export class CircularRules extends ChessRules {
       let j = y + step[1];
       while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
         moves.push(this.getBasicMove([x, y], [i, j]));
-        if (oneStep !== undefined) continue outerLoop;
+        if (oneStep) continue outerLoop;
         i = V.ComputeX(i + step[0]);
         j += step[1];
       }
diff --git a/client/src/variants/Clorange.js b/client/src/variants/Clorange.js
index d4ec1ef3..30256fa6 100644
--- a/client/src/variants/Clorange.js
+++ b/client/src/variants/Clorange.js
@@ -20,9 +20,9 @@ export class ClorangeRules extends ChessRules {
     );
   }
 
-  static GenRandInitFen(randomness) {
+  static GenRandInitFen(options) {
     // Capturing and non-capturing reserves:
-    return ChessRules.GenRandInitFen(randomness) + " 00000000000000000000";
+    return ChessRules.GenRandInitFen(options) + " 00000000000000000000";
   }
 
   getFen() {
@@ -195,22 +195,11 @@ export class ClorangeRules extends ChessRules {
     return moves;
   }
 
-  getSlideNJumpMoves([x, y], steps, oneStep) {
-    let moves = [];
-    const canTake = ChessRules.PIECES.includes(this.getPiece(x, y));
-    outerLoop: for (let step of steps) {
-      let i = x + step[0];
-      let j = y + step[1];
-      while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
-        moves.push(this.getBasicMove([x, y], [i, j]));
-        if (oneStep) continue outerLoop;
-        i += step[0];
-        j += step[1];
-      }
-      if (V.OnBoard(i, j) && canTake && this.canTake([x, y], [i, j]))
-        moves.push(this.getBasicMove([x, y], [i, j]));
-    }
-    return moves;
+  canTake([x1, y1], [x2, y2]) {
+    return (
+      this.getColor(x1, y1) !== this.getColor(x2, y2) &&
+      ChessRules.PIECES.includes(this.getPiece(x1, y1))
+    );
   }
 
   getAllValidMoves() {
diff --git a/client/src/variants/Convert.js b/client/src/variants/Convert.js
index 1180e375..c501c023 100644
--- a/client/src/variants/Convert.js
+++ b/client/src/variants/Convert.js
@@ -13,10 +13,8 @@ export class ConvertRules extends ChessRules {
     this.lastMoveEnd = [null];
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
-      return "rnbqkbnr/8/pppppppp/8/8/PPPPPPPP/8/RNBQKBNR w 0 ahah";
-    const baseFen = ChessRules.GenRandInitFen(randomness);
+  static GenRandInitFen(options) {
+    const baseFen = ChessRules.GenRandInitFen(options);
     return (
       baseFen.substr(0, 8) +
       "/8/pppppppp/8/8/PPPPPPPP/8/" +
diff --git a/client/src/variants/Copycat.js b/client/src/variants/Copycat.js
index 78299c69..c7d12a52 100644
--- a/client/src/variants/Copycat.js
+++ b/client/src/variants/Copycat.js
@@ -8,7 +8,6 @@ export class CopycatRules extends ChessRules {
     const piece = this.getPiece(x,y);
     if ([V.PAWN, V.KING].includes(piece)) return moves;
     const color = this.turn;
-    const oneStep = (piece == V.PAWN);
     let movements = {},
         steps = [];
     if (piece == V.QUEEN) steps = V.steps[V.ROOK].concat(V.steps[V.BISHOP]);
@@ -39,8 +38,9 @@ export class CopycatRules extends ChessRules {
         (piece != V.QUEEN && type != piece) ||
         (piece == V.QUEEN && type == V.KNIGHT)
       ) {
+        const nbSteps = (type == V.KNIGHT ? 1 : undefined);
         Array.prototype.push.apply(moves,
-          this.getSlideNJumpMoves([x, y], V.steps[type], type == V.KNIGHT));
+          super.getSlideNJumpMoves([x, y], V.steps[type], nbSteps));
       }
     });
     return moves;
diff --git a/client/src/variants/Coregal.js b/client/src/variants/Coregal.js
index cf83f1fc..aa023c15 100644
--- a/client/src/variants/Coregal.js
+++ b/client/src/variants/Coregal.js
@@ -78,15 +78,15 @@ export class CoregalRules extends ChessRules {
     return squares;
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
+  static GenRandInitFen(options) {
+    if (options.randomness == 0)
       // Castle flags here indicate pieces positions (if can castle)
       return "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w 0 adehadeh -";
 
     let pieces = { w: new Array(8), b: new Array(8) };
     let flags = "";
     for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
+      if (c == 'b' && options.randomness == 1) {
         pieces['b'] = pieces['w'];
         flags += flags;
         break;
@@ -186,10 +186,7 @@ export class CoregalRules extends ChessRules {
 
   getPotentialKingMoves([x, y]) {
     let moves = this.getSlideNJumpMoves(
-      [x, y],
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-      "oneStep"
-    );
+      [x, y], V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
     const c = this.getColor(x, y);
     if (this.castleFlags[c].slice(1, 3).includes(y))
       moves = moves.concat(this.getCastleMoves([x, y]));
diff --git a/client/src/variants/Crazyhouse.js b/client/src/variants/Crazyhouse.js
index 56e65412..eabdd493 100644
--- a/client/src/variants/Crazyhouse.js
+++ b/client/src/variants/Crazyhouse.js
@@ -38,8 +38,8 @@ export class CrazyhouseRules extends ChessRules {
     );
   }
 
-  static GenRandInitFen(randomness) {
-    return ChessRules.GenRandInitFen(randomness) + " 0000000000 -";
+  static GenRandInitFen(options) {
+    return ChessRules.GenRandInitFen(options) + " 0000000000 -";
   }
 
   getFen() {
@@ -237,11 +237,13 @@ export class CrazyhouseRules extends ChessRules {
     if (move.vanish.length > 0) return super.getNotation(move);
     // Rebirth:
     let piece = move.appear[0].p;
-    if (ChessRules.PIECES.includes(piece)) {
-      if (move.appear[0].p != V.PAWN) piece = move.appear[0].p.toUpperCase();
+    let prefix = "";
+    const endNotation = "@" + V.CoordsToSquare(move.end);
+    if (piece != V.PAWN) {
+      if (ChessRules.PIECES.includes(piece)) prefix = piece.toUpperCase();
+      else piece = V.PromotionMap[piece].toUpperCase();
     }
-    else piece = V.PromotionMap[piece].toUpperCase();
-    return piece + "@" + V.CoordsToSquare(move.end);
+    return prefix + endNotation;
   }
 
 };
diff --git a/client/src/variants/Cwda.js b/client/src/variants/Cwda.js
index 6e30e681..c0d36edd 100644
--- a/client/src/variants/Cwda.js
+++ b/client/src/variants/Cwda.js
@@ -1,81 +1,220 @@
-import { ChessRules, Move, PiPo } from "@/base_rules";
-import { ArrayFun } from "@/utils/array";
-import { randInt } from "@/utils/alea";
+import { ChessRules } from "@/base_rules";
 
 export class CwdaRules extends ChessRules {
 
-  static get PawnSpecs() {
-    return Object.assign(
-      {},
-      ChessRules.PawnSpecs,
-      {
-        promotions:
-          ChessRules.PawnSpecs.promotions.concat(
-          [V.C_ROOK, V.C_KNIGHT, V.C_BISHOP, V.C_QUEEN])
-      }
+  static get Options() {
+    return {
+      select: ChessRules.Options.select.concat([
+        {
+          label: "Army 1",
+          variable: "army1",
+          defaut: 'C',
+          options: [
+            { label: "Colorbound Clobberers", value: 'C' },
+            { label: "Nutty Knights", value: 'N' },
+            { label: "Remarkable Rookies", value: 'R' },
+            { label: "Fide", value: 'F' }
+          ]
+        },
+        {
+          label: "Army 2",
+          variable: "army2",
+          defaut: 'C',
+          options: [
+            { label: "Colorbound Clobberers", value: 'C' },
+            { label: "Nutty Knights", value: 'N' },
+            { label: "Remarkable Rookies", value: 'R' },
+            { label: "Fide", value: 'F' }
+          ]
+        }
+      ])
+    };
+  }
+
+  static AbbreviateOptions(opts) {
+    return opts["army1"] + opts["army2"];
+  }
+
+  static IsValidOptions(opts) {
+    // Both armies filled, avoid Fide vs Fide
+    return (
+      opts.army1 && opts.army2 &&
+      (opts.army1 != 'F' || opts.army2 != 'F')
     );
   }
 
   getPpath(b) {
-    if ([V.C_ROOK, V.C_KNIGHT, V.C_BISHOP, V.C_QUEEN].includes(b[1]))
-      return "Cwda/" + b;
-    return b;
-  }
-
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
-      return "dhaskahd/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w 0 ahah -";
-
-    // Mapping white --> black (at least at start):
-    const piecesMap = {
-      'r': 'd',
-      'n': 'h',
-      'b': 'a',
-      'q': 's',
-      'k': 'k'
+    return (ChessRules.PIECES.includes(b[1]) ? "" : "Cwda/") + b;
+  }
+
+  static get PiecesMap() {
+    return {
+      // Colorbound Clobberers
+      'C': {
+        'r': 'd',
+        'n': 'w',
+        'b': 'f',
+        'q': 'c',
+        'k': 'k'
+      },
+      // Nutty Knights
+      'N': {
+        'r': 'g',
+        'n': 'i',
+        'b': 't',
+        'q': 'l',
+        'k': 'k'
+      },
+      // Remarkable Rookies
+      'R': {
+        'r': 's',
+        'n': 'y',
+        'b': 'h',
+        'q': 'o',
+        'k': 'k'
+      }
     };
+  }
 
-    const baseFen = ChessRules.GenRandInitFen(randomness);
+  static GenRandInitFen(options) {
+    const baseFen = ChessRules.GenRandInitFen(options.randomness);
+    let blackLine = baseFen.substr(0, 8);
+    if (options.army2 != 'F') {
+      blackLine = blackLine.split('')
+        .map(p => V.PiecesMap[options.army2][p]).join('');
+    }
+    let whiteLine = baseFen.substr(35, 8);
+    if (options.army1 != 'F') {
+      whiteLine = whiteLine.split('')
+        .map(p => V.PiecesMap[options.army1][p.toLowerCase()])
+        .join('').toUpperCase();
+    }
     return (
-      baseFen.substr(0, 8).split('').map(p => piecesMap[p]).join('') +
-      baseFen.substr(8)
+      blackLine + baseFen.substring(8, 35) + whiteLine +
+      baseFen.substr(43) + " " + options.army1 + options.army2
     );
   }
 
+  setOtherVariables(fen) {
+    super.setOtherVariables(fen);
+    const armies = V.ParseFen(fen).armies;
+    this.army1 = armies.charAt(0);
+    this.army2 = armies.charAt(1);
+  }
+
+  static ParseFen(fen) {
+    return Object.assign(
+      { armies: fen.split(" ")[5] },
+      ChessRules.ParseFen(fen)
+    );
+  }
+
+  static IsGoodFen(fen) {
+    if (!ChessRules.IsGoodFen(fen)) return false;
+    const armies = V.ParseFen(fen).armies;
+    if (!armies || !armies.match(/^[CNRF]{2,2}$/)) return false;
+    return true;
+  }
+
+  getFen() {
+    return super.getFen() + " " + this.army1 + this.army2;
+  }
+
   static get C_ROOK() {
     return 'd';
   }
   static get C_KNIGHT() {
-    return 'h';
+    return 'w';
   }
   static get C_BISHOP() {
-    return 'a';
+    return 'f';
   }
   static get C_QUEEN() {
+    return 'c';
+  }
+  static get N_ROOK() {
+    return 'g';
+  }
+  static get N_KNIGHT() {
+    return 'i';
+  }
+  static get N_BISHOP() {
+    return 't';
+  }
+  static get N_QUEEN() {
+    return 'l';
+  }
+  static get R_ROOK() {
     return 's';
   }
+  static get R_KNIGHT() {
+    return 'y';
+  }
+  static get R_BISHOP() {
+    return 'h';
+  }
+  static get R_QUEEN() {
+    return 'o';
+  }
 
   static get PIECES() {
-    return (
-      ChessRules.PIECES.concat([V.C_ROOK, V.C_KNIGHT, V.C_BISHOP, V.C_QUEEN])
-    );
+    return ChessRules.PIECES.concat(
+      [V.C_ROOK, V.C_KNIGHT, V.C_BISHOP, V.C_QUEEN]).concat(
+      [V.N_ROOK, V.N_KNIGHT, V.N_BISHOP, V.N_QUEEN]).concat(
+      [V.R_ROOK, V.R_KNIGHT, V.R_BISHOP, V.R_QUEEN]);
   }
 
-  getPotentialMovesFrom([x, y]) {
-    switch (this.getPiece(x, y)) {
-      case V.C_ROOK: return this.getPotentialC_rookMoves([x, y]);
-      case V.C_KNIGHT: return this.getPotentialC_knightMoves([x, y]);
-      case V.C_BISHOP: return this.getPotentialC_bishopMoves([x, y]);
-      case V.C_QUEEN: return this.getPotentialC_queenMoves([x, y]);
-      default: return super.getPotentialMovesFrom([x, y]);
+  getPotentialMovesFrom(sq) {
+    switch (this.getPiece(sq[0], sq[1])) {
+      case V.C_ROOK: return this.getPotentialC_rookMoves(sq);
+      case V.C_KNIGHT: return this.getPotentialC_knightMoves(sq);
+      case V.C_BISHOP: return this.getPotentialC_bishopMoves(sq);
+      case V.C_QUEEN: return this.getPotentialC_queenMoves(sq);
+      case V.N_ROOK: return this.getPotentialN_rookMoves(sq);
+      case V.N_KNIGHT: return this.getPotentialN_knightMoves(sq);
+      case V.N_BISHOP: return this.getPotentialN_bishopMoves(sq);
+      case V.N_QUEEN: return this.getPotentialN_queenMoves(sq);
+      case V.R_ROOK: return this.getPotentialR_rookMoves(sq);
+      case V.R_KNIGHT: return this.getPotentialR_knightMoves(sq);
+      case V.R_BISHOP: return this.getPotentialR_bishopMoves(sq);
+      case V.R_QUEEN: return this.getPotentialR_queenMoves(sq);
+      case V.PAWN: {
+        // Can promote in anything from the two current armies
+        let promotions = [];
+        for (let army of ["army1", "army2"]) {
+          if (army == "army2" && this.army2 == this.army1) break;
+          switch (this[army]) {
+            case 'C': {
+              Array.prototype.push.apply(promotions,
+                [V.C_ROOK, V.C_KNIGHT, V.C_BISHOP, V.C_QUEEN]);
+              break;
+            }
+            case 'N': {
+              Array.prototype.push.apply(promotions,
+                [V.N_ROOK, V.N_KNIGHT, V.N_BISHOP, V.N_QUEEN]);
+              break;
+            }
+            case 'R': {
+              Array.prototype.push.apply(promotions,
+                [V.R_ROOK, V.R_KNIGHT, V.R_BISHOP, V.R_QUEEN]);
+              break;
+            }
+            case 'F': {
+              Array.prototype.push.apply(promotions,
+                [V.ROOK, V.KNIGHT, V.BISHOP, V.QUEEN]);
+              break;
+            }
+          }
+        }
+        return super.getPotentialPawnMoves(sq, promotions);
+      }
+      default: return super.getPotentialMovesFrom(sq);
     }
     return [];
   }
 
   static get steps() {
     return Object.assign(
-      {},
-      ChessRules.steps,
       {
         // Dabbabah
         'd': [
@@ -97,106 +236,301 @@ export class CwdaRules extends ChessRules {
           [1, -1],
           [-1, 1],
           [-1, -1]
+        ],
+        // Wazir
+        'w': [
+          [-1, 0],
+          [0, -1],
+          [1, 0],
+          [0, 1]
+        ],
+        // Threeleaper
+        '$3': [
+          [-3, 0],
+          [0, -3],
+          [3, 0],
+          [0, 3]
+        ],
+        // Narrow knight
+        '$n': [
+          [-2, -1],
+          [-2, 1],
+          [2, -1],
+          [2, 1]
         ]
-      }
+      },
+      ChessRules.steps,
     );
   }
 
   getPotentialC_rookMoves(sq) {
     return (
-      this.getSlideNJumpMoves(sq, V.steps[V.BISHOP]).concat(
-      this.getSlideNJumpMoves(sq, V.steps['d'], "oneStep"))
+      this.getSlideNJumpMoves(sq, V.steps.b).concat(
+      this.getSlideNJumpMoves(sq, V.steps.d, 1))
     );
   }
 
   getPotentialC_knightMoves(sq) {
     return (
-      this.getSlideNJumpMoves(sq, V.steps['a'], "oneStep").concat(
-      this.getSlideNJumpMoves(sq, V.steps[V.ROOK], "oneStep"))
+      this.getSlideNJumpMoves(sq, V.steps.a, 1).concat(
+      this.getSlideNJumpMoves(sq, V.steps.r, 1))
     );
   }
 
   getPotentialC_bishopMoves(sq) {
     return (
-      this.getSlideNJumpMoves(sq, V.steps['d'], "oneStep").concat(
-      this.getSlideNJumpMoves(sq, V.steps['a'], "oneStep")).concat(
-      this.getSlideNJumpMoves(sq, V.steps[V.BISHOP], "oneStep"))
+      this.getSlideNJumpMoves(sq, V.steps.d, 1).concat(
+      this.getSlideNJumpMoves(sq, V.steps.a, 1)).concat(
+      this.getSlideNJumpMoves(sq, V.steps.b, 1))
     );
   }
 
   getPotentialC_queenMoves(sq) {
     return (
-      this.getSlideNJumpMoves(sq, V.steps[V.BISHOP]).concat(
-        this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep"))
+      this.getSlideNJumpMoves(sq, V.steps.b).concat(
+        this.getSlideNJumpMoves(sq, V.steps.n, 1))
+    );
+  }
+
+  getPotentialN_rookMoves(sq) {
+    const c = this.turn;
+    const rookSteps = [ [0, -1], [0, 1], [c == 'w' ? -1 : 1, 0] ];
+    const backward = (c == 'w' ? 1 : -1);
+    const kingSteps = [ [backward, -1], [backward, 0], [backward, 1] ];
+    return (
+      this.getSlideNJumpMoves(sq, rookSteps).concat(
+      this.getSlideNJumpMoves(sq, kingSteps, 1))
+    );
+  }
+
+  getPotentialN_knightMoves(sq) {
+    const backward = (this.turn == 'w' ? 1 : -1);
+    const kingSteps = [
+      [0, -1], [0, 1], [backward, -1], [backward, 0], [backward, 1]
+    ];
+    return (
+      this.getSlideNJumpMoves(sq, V.steps.$n, 1).concat(
+      this.getSlideNJumpMoves(sq, kingSteps, 1))
+    );
+  }
+
+  getPotentialN_bishopMoves(sq) {
+    const backward = (this.turn == 'w' ? 1 : -1);
+    const kingSteps = [
+      [0, -1], [0, 1], [backward, -1], [backward, 0], [backward, 1]
+    ];
+    const forward = -backward;
+    const knightSteps = [
+      [2*forward, -1], [2*forward, 1], [forward, -2], [forward, 2]
+    ];
+    return (
+      this.getSlideNJumpMoves(sq, knightSteps, 1).concat(
+      this.getSlideNJumpMoves(sq, kingSteps, 1))
+    );
+  }
+
+  getPotentialN_queenMoves(sq) {
+    const backward = (this.turn == 'w' ? 1 : -1);
+    const forward = -backward;
+    const kingSteps = [
+      [forward, -1], [forward, 1],
+      [backward, -1], [backward, 0], [backward, 1]
+    ];
+    const knightSteps = [
+      [2*forward, -1], [2*forward, 1], [forward, -2], [forward, 2]
+    ];
+    const rookSteps = [ [0, -1], [0, 1], [forward, 0] ];
+    return (
+      this.getSlideNJumpMoves(sq, rookSteps).concat(
+      this.getSlideNJumpMoves(sq, kingSteps, 1)).concat(
+      this.getSlideNJumpMoves(sq, knightSteps, 1))
+    );
+  }
+
+  getPotentialR_rookMoves(sq) {
+    return this.getSlideNJumpMoves(sq, V.steps.r, 4);
+  }
+
+  getPotentialR_knightMoves(sq) {
+    return (
+      this.getSlideNJumpMoves(sq, V.steps.d, 1).concat(
+      this.getSlideNJumpMoves(sq, V.steps.w, 1))
+    );
+  }
+
+  getPotentialR_bishopMoves(sq) {
+    return (
+      this.getSlideNJumpMoves(sq, V.steps.d, 1).concat(
+      this.getSlideNJumpMoves(sq, V.steps.f, 1)).concat(
+      this.getSlideNJumpMoves(sq, V.steps.$3, 1))
+    );
+  }
+
+  getPotentialR_queenMoves(sq) {
+    return (
+      this.getSlideNJumpMoves(sq, V.steps.r).concat(
+      this.getSlideNJumpMoves(sq, V.steps.n, 1))
     );
   }
 
   getCastleMoves([x, y]) {
     const color = this.getColor(x, y);
-    const finalSquares = [
-      // Black castle long in an unusual way:
-      (color == 'w' ? [2, 3] : [1, 2]),
-      [V.size.y - 2, V.size.y - 3]
-    ];
+    let finalSquares = [ [2, 3], [V.size.y - 2, V.size.y - 3] ];
+    if (
+      (color == 'w' && this.army1 == 'C') ||
+      (color == 'b' && this.army2 == 'C')
+    ) {
+      // Colorbound castle long in an unusual way:
+      finalSquares[0] = [1, 2];
+    }
     return super.getCastleMoves([x, y], finalSquares);
   }
 
   isAttacked(sq, color) {
-    return (
-      super.isAttacked(sq, color) ||
-      this.isAttackedByC_rook(sq, color) ||
-      this.isAttackedByC_knight(sq, color) ||
-      this.isAttackedByC_bishop(sq, color) ||
-      this.isAttackedByC_queen(sq, color)
-    );
+    if (super.isAttackedByPawn(sq, color) || super.isAttackedByKing(sq, color))
+      return true;
+    for (let army of ['C', 'N', 'R', 'F']) {
+      if (
+        [this.army1, this.army2].includes(army) &&
+        (
+          this["isAttackedBy" + army + "_rook"](sq, color) ||
+          this["isAttackedBy" + army + "_knight"](sq, color) ||
+          this["isAttackedBy" + army + "_bishop"](sq, color) ||
+          this["isAttackedBy" + army + "_queen"](sq, color)
+        )
+      ) {
+        return true;
+      }
+    }
+    return false;
   }
 
   isAttackedByC_rook(sq, color) {
     return (
-      this.isAttackedBySlideNJump(sq, color, V.C_ROOK, V.steps[V.BISHOP]) ||
-      this.isAttackedBySlideNJump(
-        sq, color, V.C_ROOK, V.steps['d'], "oneStep")
+      this.isAttackedBySlideNJump(sq, color, V.C_ROOK, V.steps.b) ||
+      this.isAttackedBySlideNJump(sq, color, V.C_ROOK, V.steps.d, 1)
     );
   }
 
   isAttackedByC_knight(sq, color) {
     return (
-      this.isAttackedBySlideNJump(
-        sq, color, V.C_KNIGHT, V.steps[V.ROOK], "oneStep") ||
-      this.isAttackedBySlideNJump(
-        sq, color, V.C_KNIGHT, V.steps['a'], "oneStep")
+      this.isAttackedBySlideNJump(sq, color, V.C_KNIGHT, V.steps.r, 1) ||
+      this.isAttackedBySlideNJump(sq, color, V.C_KNIGHT, V.steps.a, 1)
     );
   }
 
   isAttackedByC_bishop(sq, color) {
     return (
-      this.isAttackedBySlideNJump(
-        sq, color, V.C_BISHOP, V.steps['d'], "oneStep") ||
-      this.isAttackedBySlideNJump(
-        sq, color, V.C_BISHOP, V.steps['a'], "oneStep") ||
-      this.isAttackedBySlideNJump(
-        sq, color, V.C_BISHOP, V.steps['f'], "oneStep")
+      this.isAttackedBySlideNJump(sq, color, V.C_BISHOP, V.steps.d, 1) ||
+      this.isAttackedBySlideNJump(sq, color, V.C_BISHOP, V.steps.a, 1) ||
+      this.isAttackedBySlideNJump(sq, color, V.C_BISHOP, V.steps.f, 1)
     );
   }
 
   isAttackedByC_queen(sq, color) {
     return (
-      this.isAttackedBySlideNJump(sq, color, V.C_QUEEN, V.steps[V.BISHOP]) ||
-      this.isAttackedBySlideNJump(
-        sq, color, V.C_QUEEN, V.steps[V.KNIGHT], "oneStep")
+      this.isAttackedBySlideNJump(sq, color, V.C_QUEEN, V.steps.b) ||
+      this.isAttackedBySlideNJump(sq, color, V.C_QUEEN, V.steps.n, 1)
+    );
+  }
+
+  isAttackedByN_rook(sq, color) {
+    const rookSteps = [ [0, -1], [0, 1], [color == 'w' ? 1 : -1, 0] ];
+    const backward = (color == 'w' ? -1 : 1);
+    const kingSteps = [ [backward, -1], [backward, 0], [backward, 1] ];
+    return (
+      this.isAttackedBySlideNJump(sq, color, V.N_ROOK, rookSteps) ||
+      this.isAttackedBySlideNJump(sq, color, V.N_ROOK, kingSteps, 1)
+    );
+  }
+
+  isAttackedByN_knight(sq, color) {
+    const backward = (color == 'w' ? -1 : 1);
+    const kingSteps = [
+      [0, -1], [0, 1], [backward, -1], [backward, 0], [backward, 1]
+    ];
+    return (
+      this.isAttackedBySlideNJump(sq, color, V.N_KNIGHT, V.steps.$n) ||
+      this.isAttackedBySlideNJump(sq, color, V.N_KNIGHT, kingSteps, 1)
+    );
+  }
+
+  isAttackedByN_bishop(sq, color) {
+    const backward = (color == 'w' ? -1 : 1);
+    const kingSteps = [
+      [0, -1], [0, 1], [backward, -1], [backward, 0], [backward, 1]
+    ];
+    const forward = -backward;
+    const knightSteps = [
+      [2*forward, -1], [2*forward, 1], [forward, -2], [forward, 2]
+    ];
+    return (
+      this.isAttackedBySlideNJump(sq, color, V.N_BISHOP, knightSteps, 1) ||
+      this.isAttackedBySlideNJump(sq, color, V.N_BISHOP, kingSteps, 1)
+    );
+  }
+
+  isAttackedByN_queen(sq, color) {
+    const backward = (color == 'w' ? -1 : 1);
+    const forward = -backward;
+    const kingSteps = [
+      [forward, -1], [forward, 1],
+      [backward, -1], [backward, 0], [backward, 1]
+    ];
+    const knightSteps = [
+      [2*forward, -1], [2*forward, 1], [forward, -2], [forward, 2]
+    ];
+    const rookSteps = [ [0, -1], [0, 1], [forward, 0] ];
+    return (
+      this.isAttackedBySlideNJump(sq, color, V.N_QUEEN, knightSteps, 1) ||
+      this.isAttackedBySlideNJump(sq, color, V.N_QUEEN, kingSteps, 1) ||
+      this.isAttackedBySlideNJump(sq, color, V.N_QUEEN, rookSteps)
+    );
+  }
+
+  isAttackedByR_rook(sq, color) {
+    return this.isAttackedBySlideNJump(sq, color, V.R_ROOK, V.steps.r, 4);
+  }
+
+  isAttackedByR_knight(sq, color) {
+    return (
+      this.isAttackedBySlideNJump(sq, color, V.R_KNIGHT, V.steps.d, 1) ||
+      this.isAttackedBySlideNJump(sq, color, V.R_KNIGHT, V.steps.w, 1)
+    );
+  }
+
+  isAttackedByR_bishop(sq, color) {
+    return (
+      this.isAttackedBySlideNJump(sq, color, V.R_BISHOP, V.steps.d, 1) ||
+      this.isAttackedBySlideNJump(sq, color, V.R_BISHOP, V.steps.f, 1) ||
+      this.isAttackedBySlideNJump(sq, color, V.R_BISHOP, V.steps.$3, 1)
+    );
+  }
+
+  isAttackedByR_queen(sq, color) {
+    return (
+      this.isAttackedBySlideNJump(sq, color, V.R_QUEEN, V.steps.r) ||
+      this.isAttackedBySlideNJump(sq, color, V.R_QUEEN, V.steps.n, 1)
     );
   }
 
   static get VALUES() {
     return Object.assign(
-      {},
-      ChessRules.VALUES,
       {
         d: 4,
-        h: 3,
-        a: 5,
-        s: 6
-      }
+        w: 3,
+        f: 5,
+        c: 7,
+        g: 4,
+        i: 3,
+        t: 4,
+        l: 7,
+        s: 4,
+        y: 3,
+        h: 4,
+        o: 8
+      },
+      ChessRules.VALUES
     );
   }
 
diff --git a/client/src/variants/Cylinder.js b/client/src/variants/Cylinder.js
index 8b68e9ce..bcb53932 100644
--- a/client/src/variants/Cylinder.js
+++ b/client/src/variants/Cylinder.js
@@ -22,7 +22,7 @@ export class CylinderRules extends ChessRules {
       let j = V.ComputeY(y + step[1]);
       while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
         moves.push(this.getBasicMove([x, y], [i, j]));
-        if (oneStep !== undefined) continue outerLoop;
+        if (oneStep) continue outerLoop;
         i += step[0];
         j = V.ComputeY(j + step[1]);
       }
diff --git a/client/src/variants/Diamond.js b/client/src/variants/Diamond.js
index 1aa9b0ef..658b7ad7 100644
--- a/client/src/variants/Diamond.js
+++ b/client/src/variants/Diamond.js
@@ -12,12 +12,12 @@ export class DiamondRules extends ChessRules {
     return false;
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
+  static GenRandInitFen(options) {
+    if (options.randomness == 0)
       return "krbp4/rqnp4/nbpp4/pppp4/4PPPP/4PPBN/4PNQR/4PBRK w 0";
     let pieces = { w: new Array(8), b: new Array(8) };
     for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
+      if (c == 'b' && options.randomness == 1) {
         pieces['b'] = pieces['w'];
         break;
       }
diff --git a/client/src/variants/Dice.js b/client/src/variants/Dice.js
index 262f273d..2e987764 100644
--- a/client/src/variants/Dice.js
+++ b/client/src/variants/Dice.js
@@ -35,8 +35,8 @@ export class DiceRules extends ChessRules {
     return (L > 0 ? this.p2play[L-1] : "-");
   }
 
-  static GenRandInitFen(randomness) {
-    return ChessRules.GenRandInitFen(randomness) + " -";
+  static GenRandInitFen(options) {
+    return ChessRules.GenRandInitFen(options) + " -";
   }
 
   canMove(piece, color, [x, y]) {
diff --git a/client/src/variants/Discoduel.js b/client/src/variants/Discoduel.js
index f5735700..635e6db0 100644
--- a/client/src/variants/Discoduel.js
+++ b/client/src/variants/Discoduel.js
@@ -2,6 +2,10 @@ import { ChessRules } from "@/base_rules";
 
 export class DiscoduelRules extends ChessRules {
 
+  static get Options() {
+    return null;
+  }
+
   static get PawnSpecs() {
     return Object.assign(
       {},
diff --git a/client/src/variants/Dobutsu.js b/client/src/variants/Dobutsu.js
index da632b83..af8c4f64 100644
--- a/client/src/variants/Dobutsu.js
+++ b/client/src/variants/Dobutsu.js
@@ -4,6 +4,10 @@ import { sample, shuffle } from "@/utils/alea";
 
 export class DobutsuRules extends ChessRules {
 
+  static get Options() {
+    return null;
+  }
+
   static get HasFlags() {
     return false;
   }
@@ -207,15 +211,15 @@ export class DobutsuRules extends ChessRules {
     const c = this.turn;
     const forward = (c == 'w' ? -1 : 1);
     const steps = V.steps[V.ROOK].concat([[forward, 1], [forward, -1]]);
-    return super.getSlideNJumpMoves(sq, steps, "oneStep");
+    return super.getSlideNJumpMoves(sq, steps, 1);
   }
 
   getPotentialElephantMoves(sq) {
-    return super.getSlideNJumpMoves(sq, V.steps[V.BISHOP], "oneStep");
+    return super.getSlideNJumpMoves(sq, V.steps[V.BISHOP], 1);
   }
 
   getPotentialGiraffeMoves(sq) {
-    return super.getSlideNJumpMoves(sq, V.steps[V.ROOK], "oneStep");
+    return super.getSlideNJumpMoves(sq, V.steps[V.ROOK], 1);
   }
 
   getAllValidMoves() {
diff --git a/client/src/variants/Doublearmy.js b/client/src/variants/Doublearmy.js
index 8a6c806f..87d262a6 100644
--- a/client/src/variants/Doublearmy.js
+++ b/client/src/variants/Doublearmy.js
@@ -19,8 +19,8 @@ export class DoublearmyRules extends ChessRules {
     return (b[1] == V.COMMONER ? "Doublearmy/" : "") + b;
   }
 
-  static GenRandInitFen(randomness) {
-    const fen = ChessRules.GenRandInitFen(randomness);
+  static GenRandInitFen(options) {
+    const fen = ChessRules.GenRandInitFen(options);
     const rows = fen.split(" ")[0].split("/");
     return (
       rows[0] + "/" +
@@ -45,10 +45,7 @@ export class DoublearmyRules extends ChessRules {
 
   getPotentialCommonerMoves(sq) {
     return this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-      "oneStep"
-    );
+      sq, V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
   }
 
   isAttacked(sq, color) {
@@ -60,19 +57,13 @@ export class DoublearmyRules extends ChessRules {
 
   isAttackedByCommoner(sq, color) {
     return this.isAttackedBySlideNJump(
-      sq,
-      color,
-      V.COMMONER,
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-      "oneStep"
-    );
+      sq, color, V.COMMONER, V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
   }
 
   static get VALUES() {
     return Object.assign(
-      {},
-      ChessRules.VALUES,
-      { c: 5 }
+      { c: 5 },
+      ChessRules.VALUES
     );
   }
 
diff --git a/client/src/variants/Eightpieces.js b/client/src/variants/Eightpieces.js
index c380610c..927530c0 100644
--- a/client/src/variants/Eightpieces.js
+++ b/client/src/variants/Eightpieces.js
@@ -167,11 +167,11 @@ export class EightpiecesRules extends ChessRules {
     }
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
+  static GenRandInitFen(options) {
+    if (options.randomness == 0)
       return "jfsqkbnr/pppppppp/8/8/8/8/PPPPPPPP/JDSQKBNR w 0 ahah - -";
 
-    const baseFen = ChessRules.GenRandInitFen(randomness);
+    const baseFen = ChessRules.GenRandInitFen(options);
     const fenParts = baseFen.split(' ');
     const posParts = fenParts[0].split('/');
 
@@ -671,10 +671,7 @@ export class EightpiecesRules extends ChessRules {
 
   getPotentialKingMoves(sq) {
     const moves = this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-      "oneStep"
-    );
+      sq, V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
     return (
       this.subTurn == 1
         ? moves.concat(this.getCastleMoves(sq))
diff --git a/client/src/variants/Emergo.js b/client/src/variants/Emergo.js
index a1a98488..13069de4 100644
--- a/client/src/variants/Emergo.js
+++ b/client/src/variants/Emergo.js
@@ -8,6 +8,10 @@ export class EmergoRules extends ChessRules {
   // Lowercase if black controls.
   // Single piece (no prisoners): A@ to L@ (+ lowercase)
 
+  static get Options() {
+    return null;
+  }
+
   static get HasFlags() {
     return false;
   }
@@ -105,7 +109,7 @@ export class EmergoRules extends ChessRules {
     return { x: 9, y: 9 };
   }
 
-  static GenRandInitFen(randomness) {
+  static GenRandInitFen() {
     return "9/9/9/9/9/9/9/9/9 w 0 12,12";
   }
 
diff --git a/client/src/variants/Empire.js b/client/src/variants/Empire.js
index c8577a72..d04e4a82 100644
--- a/client/src/variants/Empire.js
+++ b/client/src/variants/Empire.js
@@ -23,8 +23,8 @@ export class EmpireRules extends ChessRules {
     return (b[0] == 'w' ? "Empire/" : "") + b;
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
+  static GenRandInitFen(options) {
+    if (options.randomness == 0)
       return "rnbqkbnr/pppppppp/8/8/8/PPPSSPPP/8/TECDKCET w 0 ah -";
 
     // Mapping kingdom --> empire:
@@ -36,7 +36,7 @@ export class EmpireRules extends ChessRules {
       'K': 'K'
     };
 
-    const baseFen = ChessRules.GenRandInitFen(randomness);
+    const baseFen = ChessRules.GenRandInitFen(options);
     return (
       baseFen.substr(0, 24) + "PPPSSPPP/8/" +
       baseFen.substr(35, 8).split('').map(p => piecesMap[p]).join('') +
@@ -211,6 +211,7 @@ export class EmpireRules extends ChessRules {
     });
   }
 
+  // TODO: some merging to do with Orda method (and into base_rules.js)
   getSlideNJumpMoves_([x, y], steps, oneStep) {
     let moves = [];
     outerLoop: for (let step of steps) {
@@ -221,7 +222,7 @@ export class EmpireRules extends ChessRules {
         if (!step.onlyTake) moves.push(this.getBasicMove([x, y], [i, j]));
         // NOTE: (bad) HACK here, since onlyTake is true only for Eagle
         // capturing moves, which are oneStep...
-        if (!!oneStep || !!step.onlyTake) continue outerLoop;
+        if (oneStep || step.onlyTake) continue outerLoop;
         i += s[0];
         j += s[1];
       }
@@ -318,10 +319,7 @@ export class EmpireRules extends ChessRules {
     if (this.getColor(x, y) == 'b') return super.getPotentialKingMoves([x, y]);
     // Empire doesn't castle:
     return super.getSlideNJumpMoves(
-      [x, y],
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-      "oneStep"
-    );
+      [x, y], V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
   }
 
   getPotentialSoldierMoves([x, y]) {
@@ -332,7 +330,7 @@ export class EmpireRules extends ChessRules {
     if (!lastRank) steps.push([shiftX, 0]);
     if (y > 0) steps.push([0, -1]);
     if (y < 9) steps.push([0, 1]);
-    return super.getSlideNJumpMoves([x, y], steps, "oneStep");
+    return super.getSlideNJumpMoves([x, y], steps, 1);
   }
 
   isAttacked(sq, color) {
@@ -356,7 +354,7 @@ export class EmpireRules extends ChessRules {
 
   isAttackedByEagle(sq, color) {
     return super.isAttackedBySlideNJump(
-      sq, color, V.EAGLE, V.steps[V.KNIGHT], "oneStep");
+      sq, color, V.EAGLE, V.steps[V.KNIGHT], 1);
   }
 
   isAttackedByCardinal(sq, color) {
@@ -368,7 +366,7 @@ export class EmpireRules extends ChessRules {
     return (
       super.isAttackedBySlideNJump(
         sq, color, V.DUKE,
-        V.steps[V.ROOK].concat(V.steps[V.BISHOP]), "oneStep"
+        V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1
       )
     );
   }
@@ -376,7 +374,7 @@ export class EmpireRules extends ChessRules {
   isAttackedBySoldier([x, y], color) {
     const shiftX = (color == 'w' ? 1 : -1); //shift from king
     return super.isAttackedBySlideNJump(
-      [x, y], color, V.SOLDIER, [[shiftX, 0], [0, 1], [0, -1]], "oneStep");
+      [x, y], color, V.SOLDIER, [[shiftX, 0], [0, 1], [0, -1]], 1);
   }
 
   updateCastleFlags(move, piece) {
diff --git a/client/src/variants/Fanorona.js b/client/src/variants/Fanorona.js
index 4593e6bb..e1e653a3 100644
--- a/client/src/variants/Fanorona.js
+++ b/client/src/variants/Fanorona.js
@@ -3,6 +3,10 @@ import { randInt } from "@/utils/alea";
 
 export class FanoronaRules extends ChessRules {
 
+  static get Options() {
+    return null;
+  }
+
   static get HasFlags() {
     return false;
   }
diff --git a/client/src/variants/Football.js b/client/src/variants/Football.js
index d63cfee3..7829c2d6 100644
--- a/client/src/variants/Football.js
+++ b/client/src/variants/Football.js
@@ -104,13 +104,13 @@ export class FootballRules extends ChessRules {
     }
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
+  static GenRandInitFen(options) {
+    if (options.randomness == 0)
       return "rnbq1knbr/9/9/9/4a4/9/9/9/RNBQ1KNBR w 0";
 
     let pieces = { w: new Array(8), b: new Array(8) };
     for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
+      if (c == 'b' && options.randomness == 1) {
         pieces['b'] = pieces['w'];
         break;
       }
@@ -314,22 +314,8 @@ export class FootballRules extends ChessRules {
     return moves;
   }
 
-  // No captures:
-  getSlideNJumpMoves([x, y], steps, oneStep) {
-    let moves = [];
-    outerLoop: for (let step of steps) {
-      let i = x + step[0];
-      let j = y + step[1];
-      let stepCount = 1;
-      while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
-        moves.push(this.getBasicMove([x, y], [i, j]));
-        if (!!oneStep) continue outerLoop;
-        i += step[0];
-        j += step[1];
-        stepCount++;
-      }
-    }
-    return moves;
+  canTake() {
+    return false;
   }
 
   // Extra arg "computer" to avoid trimming all redundant pass moves:
diff --git a/client/src/variants/Fugue.js b/client/src/variants/Fugue.js
index c29324ac..2c83fb2c 100644
--- a/client/src/variants/Fugue.js
+++ b/client/src/variants/Fugue.js
@@ -122,7 +122,11 @@ export class FugueRules extends ChessRules {
   }
 
   canTake([x1, y1], [x2, y2]) {
-    return !this.isProtected([x2, y2]) && super.canTake([x1, y1], [x2, y2]);
+    return (
+      [V.QUEEN, V.KING].includes(this.getPiece(x1, y1)) &&
+      !this.isProtected([x2, y2]) &&
+      this.getColor(x1, y1) != this.getColor(x2, y2)
+    );
   }
 
   getPotentialMovesFrom([x, y]) {
@@ -143,30 +147,6 @@ export class FugueRules extends ChessRules {
     }
   }
 
-  getSlideNJumpMoves([x, y], steps, oneStep) {
-    const piece = this.getPiece(x, y);
-    let moves = [];
-    outerLoop: for (let step of steps) {
-      let i = x + step[0];
-      let j = y + step[1];
-      while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
-        moves.push(this.getBasicMove([x, y], [i, j]));
-        if (oneStep !== undefined) continue outerLoop;
-        i += step[0];
-        j += step[1];
-      }
-      // Only queen and king can take on occupied square:
-      if (
-        [V.KING, V.QUEEN].includes(piece) &&
-        V.OnBoard(i, j) &&
-        this.canTake([x, y], [i, j])
-      ) {
-        moves.push(this.getBasicMove([x, y], [i, j]));
-      }
-    }
-    return moves;
-  }
-
   // "Cannon/grasshopper pawn"
   getPotentialPawnMoves([x, y]) {
     const c = this.turn;
@@ -228,7 +208,7 @@ export class FugueRules extends ChessRules {
 
   getPotentialKingMoves(sq) {
     const steps = V.steps[V.ROOK].concat(V.steps[V.BISHOP]);
-    return this.getSlideNJumpMoves(sq, steps, "oneStep");
+    return this.getSlideNJumpMoves(sq, steps, 1);
   }
 
   // NOTE: not really captures, but let's keep the name
@@ -512,8 +492,8 @@ export class FugueRules extends ChessRules {
     }
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0) {
+  static GenRandInitFen(options) {
+    if (options.randomness == 0) {
       return (
         "wlqksaui/pppppppp/8/8/8/8/PPPPPPPP/IUASKQLW w 0"
       );
@@ -522,7 +502,7 @@ export class FugueRules extends ChessRules {
     let pieces = { w: new Array(8), b: new Array(8) };
     // Shuffle pieces on first and last rank
     for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
+      if (c == 'b' && options.randomness == 1) {
         pieces['b'] = pieces['w'];
         break;
       }
diff --git a/client/src/variants/Fullcavalry.js b/client/src/variants/Fullcavalry.js
index c211aa8f..07951f6b 100644
--- a/client/src/variants/Fullcavalry.js
+++ b/client/src/variants/Fullcavalry.js
@@ -88,12 +88,12 @@ export class FullcavalryRules extends ChessRules {
     );
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
+  static GenRandInitFen(options) {
+    if (options.randomness == 0)
       // Deterministic:
       return "enbqkbnm/pppppppp/8/8/8/8/PPPPPPPP/ENBQKBNM w 0 ahah -";
 
-    const baseFen = ChessRules.GenRandInitFen(randomness);
+    const baseFen = ChessRules.GenRandInitFen(options);
     // Replace rooks by lancers with expected orientation:
     const firstBlackRook = baseFen.indexOf('r'),
           lastBlackRook = baseFen.lastIndexOf('r'),
diff --git a/client/src/variants/Fusion.js b/client/src/variants/Fusion.js
index 2eb8b2da..2179aae2 100644
--- a/client/src/variants/Fusion.js
+++ b/client/src/variants/Fusion.js
@@ -185,7 +185,7 @@ export class FusionRules extends ChessRules {
             ]
           })
         );
-        if (!!oneStep) continue outerLoop;
+        if (oneStep) continue outerLoop;
         i += step[0];
         j += step[1];
       }
@@ -326,32 +326,29 @@ export class FusionRules extends ChessRules {
   isAttackedByBN(sq, color) {
     return (
       this.isAttackedBySlideNJump(sq, color, V.BN, V.steps[V.BISHOP]) ||
-      this.isAttackedBySlideNJump(
-        sq, color, V.BN, V.steps[V.KNIGHT], "oneStep")
+      this.isAttackedBySlideNJump(sq, color, V.BN, V.steps[V.KNIGHT], 1)
     );
   }
 
   isAttackedByRN(sq, color) {
     return (
       this.isAttackedBySlideNJump(sq, color, V.RN, V.steps[V.ROOK]) ||
-      this.isAttackedBySlideNJump(
-        sq, color, V.RN, V.steps[V.KNIGHT], "oneStep")
+      this.isAttackedBySlideNJump(sq, color, V.RN, V.steps[V.KNIGHT], 1)
     );
   }
 
   isAttackedByKN(sq, color) {
     const steps = V.steps[V.ROOK].concat(V.steps[V.BISHOP]);
     return (
-      this.isAttackedBySlideNJump(sq, color, V.KN, steps, "oneStep") ||
-      this.isAttackedBySlideNJump(
-        sq, color, V.KN, V.steps[V.KNIGHT], "oneStep")
+      this.isAttackedBySlideNJump(sq, color, V.KN, steps, 1) ||
+      this.isAttackedBySlideNJump(sq, color, V.KN, V.steps[V.KNIGHT], 1)
     );
   }
 
   isAttackedByKB(sq, color) {
     const steps = V.steps[V.ROOK].concat(V.steps[V.BISHOP]);
     return (
-      this.isAttackedBySlideNJump(sq, color, V.KB, steps, "oneStep") ||
+      this.isAttackedBySlideNJump(sq, color, V.KB, steps, 1) ||
       this.isAttackedBySlideNJump(sq, color, V.KB, V.steps[V.BISHOP])
     );
   }
@@ -359,7 +356,7 @@ export class FusionRules extends ChessRules {
   isAttackedByKR(sq, color) {
     const steps = V.steps[V.ROOK].concat(V.steps[V.BISHOP]);
     return (
-      this.isAttackedBySlideNJump(sq, color, V.KR, steps, "oneStep") ||
+      this.isAttackedBySlideNJump(sq, color, V.KR, steps, 1) ||
       this.isAttackedBySlideNJump(sq, color, V.KR, V.steps[V.ROOK])
     );
   }
diff --git a/client/src/variants/Gomoku.js b/client/src/variants/Gomoku.js
index 51d0bed5..621f6e6f 100644
--- a/client/src/variants/Gomoku.js
+++ b/client/src/variants/Gomoku.js
@@ -3,6 +3,10 @@ import { randInt } from "@/utils/alea";
 
 export class GomokuRules extends ChessRules {
 
+  static get Options() {
+    return null;
+  }
+
   static get Monochrome() {
     return true;
   }
diff --git a/client/src/variants/Grand.js b/client/src/variants/Grand.js
index 43cad103..7be8886c 100644
--- a/client/src/variants/Grand.js
+++ b/client/src/variants/Grand.js
@@ -121,13 +121,13 @@ export class GrandRules extends ChessRules {
 
   getPotentialMarshallMoves(sq) {
     return this.getSlideNJumpMoves(sq, V.steps[V.ROOK]).concat(
-      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep")
+      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], 1)
     );
   }
 
   getPotentialCardinalMoves(sq) {
     return this.getSlideNJumpMoves(sq, V.steps[V.BISHOP]).concat(
-      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep")
+      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], 1)
     );
   }
 
@@ -142,26 +142,14 @@ export class GrandRules extends ChessRules {
   isAttackedByMarshall(sq, color) {
     return (
       this.isAttackedBySlideNJump(sq, color, V.MARSHALL, V.steps[V.ROOK]) ||
-      this.isAttackedBySlideNJump(
-        sq,
-        color,
-        V.MARSHALL,
-        V.steps[V.KNIGHT],
-        "oneStep"
-      )
+      this.isAttackedBySlideNJump(sq, color, V.MARSHALL, V.steps[V.KNIGHT], 1)
     );
   }
 
   isAttackedByCardinal(sq, color) {
     return (
       this.isAttackedBySlideNJump(sq, color, V.CARDINAL, V.steps[V.BISHOP]) ||
-      this.isAttackedBySlideNJump(
-        sq,
-        color,
-        V.CARDINAL,
-        V.steps[V.KNIGHT],
-        "oneStep"
-      )
+      this.isAttackedBySlideNJump(sq, color, V.CARDINAL, V.steps[V.KNIGHT], 1)
     );
   }
 
@@ -176,8 +164,8 @@ export class GrandRules extends ChessRules {
     return 2;
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0) {
+  static GenRandInitFen(options) {
+    if (options.randomness == 0) {
       return (
         "r8r/1nbqkmcbn1/pppppppppp/91/91/91/91/PPPPPPPPPP/1NBQKMCBN1/R8R " +
         "w 0 -"
@@ -187,7 +175,7 @@ export class GrandRules extends ChessRules {
     let pieces = { w: new Array(8), b: new Array(8) };
     // Shuffle pieces on second and before-last rank
     for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
+      if (c == 'b' && options.randomness == 1) {
         pieces['b'] = pieces['w'];
         break;
       }
diff --git a/client/src/variants/Grasshopper.js b/client/src/variants/Grasshopper.js
index 90411d14..fcc6bb10 100644
--- a/client/src/variants/Grasshopper.js
+++ b/client/src/variants/Grasshopper.js
@@ -101,8 +101,8 @@ export class GrasshopperRules extends ChessRules {
     return 2;
   }
 
-  static GenRandInitFen(randomness) {
-    return ChessRules.GenRandInitFen(randomness)
+  static GenRandInitFen(options) {
+    return ChessRules.GenRandInitFen(options)
       .slice(0, -2)
       .replace(
         "/pppppppp/8/8/8/8/PPPPPPPP/",
diff --git a/client/src/variants/Hamilton.js b/client/src/variants/Hamilton.js
index 856725c1..8738b289 100644
--- a/client/src/variants/Hamilton.js
+++ b/client/src/variants/Hamilton.js
@@ -3,6 +3,10 @@ import { randInt } from "@/utils/alea";
 
 export class HamiltonRules extends ChessRules {
 
+  static get Options() {
+    return null;
+  }
+
   static get HasFlags() {
     return false;
   }
diff --git a/client/src/variants/Hidden.js b/client/src/variants/Hidden.js
index 280062c3..24b8dd04 100644
--- a/client/src/variants/Hidden.js
+++ b/client/src/variants/Hidden.js
@@ -4,6 +4,11 @@ import { randInt } from "@/utils/alea";
 
 export class HiddenRules extends ChessRules {
 
+  static get Options() {
+    // TODO: later, option "free placement"
+    return null;
+  }
+
   static get HasFlags() {
     return false;
   }
diff --git a/client/src/variants/Hiddenqueen.js b/client/src/variants/Hiddenqueen.js
index cbe7f929..1ce85bea 100644
--- a/client/src/variants/Hiddenqueen.js
+++ b/client/src/variants/Hiddenqueen.js
@@ -152,8 +152,8 @@ export class HiddenqueenRules extends ChessRules {
     return this.filterValid(this.getPotentialMovesFrom(sq));
   }
 
-  static GenRandInitFen(randomness) {
-    let fen = ChessRules.GenRandInitFen(randomness);
+  static GenRandInitFen(options) {
+    let fen = ChessRules.GenRandInitFen(options);
     // Place hidden queens at random (always):
     let hiddenQueenPos = randInt(8);
     let pawnRank = "PPPPPPPP".split("");
diff --git a/client/src/variants/Hoppelpoppel.js b/client/src/variants/Hoppelpoppel.js
index 59c20bb8..59574f87 100644
--- a/client/src/variants/Hoppelpoppel.js
+++ b/client/src/variants/Hoppelpoppel.js
@@ -2,6 +2,7 @@ import { ChessRules } from "@/base_rules";
 
 export class HoppelpoppelRules extends ChessRules {
 
+  // TODO: merge with base_rules.js (see also Orda, Empire)
   getSlideNJumpMoves_([x, y], steps, oneStep, options) {
     options = options || {};
     let moves = [];
@@ -10,7 +11,7 @@ export class HoppelpoppelRules extends ChessRules {
       let j = y + step[1];
       while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
         if (!options.onlyTake) moves.push(this.getBasicMove([x, y], [i, j]));
-        if (!!oneStep) continue outerLoop;
+        if (oneStep) continue outerLoop;
         i += step[0];
         j += step[1];
       }
@@ -44,21 +45,12 @@ export class HoppelpoppelRules extends ChessRules {
 
   isAttackedByKnight([x, y], color) {
     return super.isAttackedBySlideNJump(
-      [x, y],
-      color,
-      V.KNIGHT,
-      V.steps[V.BISHOP]
-    );
+      [x, y], color, V.KNIGHT, V.steps[V.BISHOP]);
   }
 
   isAttackedByBishop([x, y], color) {
     return super.isAttackedBySlideNJump(
-      [x, y],
-      color,
-      V.BISHOP,
-      V.steps[V.KNIGHT],
-      "oneStep"
-    );
+      [x, y], color, V.BISHOP, V.steps[V.KNIGHT], 1);
   }
 
 };
diff --git a/client/src/variants/Horde.js b/client/src/variants/Horde.js
index 33157c94..a54b5092 100644
--- a/client/src/variants/Horde.js
+++ b/client/src/variants/Horde.js
@@ -2,6 +2,18 @@ import { ChessRules } from "@/base_rules";
 
 export class HordeRules extends ChessRules {
 
+  static get Options() {
+    return {
+      check: [
+        {
+          label: "Random",
+          defaut: false,
+          variable: "random"
+        }
+      ]
+    };
+  }
+
   static get HasFlags() {
     return false;
   }
@@ -36,9 +48,9 @@ export class HordeRules extends ChessRules {
     return true;
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 2) randomness--;
-    const fen = ChessRules.GenRandInitFen(randomness);
+  static GenRandInitFen(options) {
+    const fen =
+      ChessRules.GenRandInitFen({ randomness: (options.random ? 1 : 0) });
     return (
       // 20 first chars are 3 rows + 3 slashes
       fen.substr(0, 20)
diff --git a/client/src/variants/Hypnotic.js b/client/src/variants/Hypnotic.js
index a429c7c4..3b678433 100644
--- a/client/src/variants/Hypnotic.js
+++ b/client/src/variants/Hypnotic.js
@@ -23,8 +23,8 @@ export class HypnoticRules extends ChessRules {
     );
   }
 
-  static GenRandInitFen(randomness) {
-    return ChessRules.GenRandInitFen(randomness) + " -";
+  static GenRandInitFen(options) {
+    return ChessRules.GenRandInitFen(options) + " -";
   }
 
   setOtherVariables(fen) {
@@ -69,7 +69,7 @@ export class HypnoticRules extends ChessRules {
       this.getPiece(x, y) == V.KING
         // No castling with enemy king (...yes, should eat it but...)
         ? super.getSlideNJumpMoves(
-          [x, y], V.steps[V.ROOK].concat(V.steps[V.BISHOP]), "oneStep")
+          [x, y], V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1)
         : super.getPotentialMovesFrom([x, y]);
     return moves;
   }
diff --git a/client/src/variants/Iceage.js b/client/src/variants/Iceage.js
index 01f82d85..a9c9fbaf 100644
--- a/client/src/variants/Iceage.js
+++ b/client/src/variants/Iceage.js
@@ -47,8 +47,8 @@ export class IceageRules extends ChessRules {
     return true;
   }
 
-  static GenRandInitFen(randomness) {
-    return ChessRules.GenRandInitFen(randomness).replace(/8/g, "cccccccc");
+  static GenRandInitFen(options) {
+    return ChessRules.GenRandInitFen(options).replace(/8/g, "cccccccc");
   }
 
   play(move) {
diff --git a/client/src/variants/Interweave.js b/client/src/variants/Interweave.js
index 1a9cd94c..3277c742 100644
--- a/client/src/variants/Interweave.js
+++ b/client/src/variants/Interweave.js
@@ -8,13 +8,13 @@ export class InterweaveRules extends ChessRules {
     return false;
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
+  static GenRandInitFen(options) {
+    if (options.randomness == 0)
       return "rbnkknbr/pppppppp/8/8/8/8/PPPPPPPP/RBNKKNBR w 0 - 000000";
 
     let pieces = { w: new Array(8), b: new Array(8) };
     for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
+      if (c == 'b' && options.randomness == 1) {
         pieces['b'] = pieces['w'];
         break;
       }
diff --git a/client/src/variants/Janggi.js b/client/src/variants/Janggi.js
index aecc8fe2..8ede111a 100644
--- a/client/src/variants/Janggi.js
+++ b/client/src/variants/Janggi.js
@@ -3,6 +3,10 @@ import { randInt } from "@/utils/alea";
 
 export class JanggiRules extends ChessRules {
 
+  static get Options() {
+    return null;
+  }
+
   static get Monochrome() {
     return true;
   }
@@ -193,7 +197,7 @@ export class JanggiRules extends ChessRules {
       if (y == 3) steps.push([shiftX, 1]);
       else if (y == 5) steps.push([shiftX, -1]);
     }
-    return super.getSlideNJumpMoves([x, y], steps, "oneStep");
+    return super.getSlideNJumpMoves([x, y], steps, 1);
   }
 
   knightStepsFromRookStep(step) {
@@ -211,7 +215,7 @@ export class JanggiRules extends ChessRules {
           this.knightStepsFromRookStep(rookStep));
       }
     }
-    return super.getSlideNJumpMoves([x, y], steps, "oneStep");
+    return super.getSlideNJumpMoves([x, y], steps, 1);
   }
 
   elephantStepsFromRookStep(step) {
@@ -234,7 +238,7 @@ export class JanggiRules extends ChessRules {
         }
       }
     }
-    return super.getSlideNJumpMoves([x, y], steps, "oneStep");
+    return super.getSlideNJumpMoves([x, y], steps, 1);
   }
 
   palacePeopleMoves([x, y]) {
@@ -278,7 +282,7 @@ export class JanggiRules extends ChessRules {
       // At the middle: all directions available
       Array.prototype.push.apply(steps, ChessRules.steps[V.BISHOP]);
     }
-    return super.getSlideNJumpMoves([x, y], steps, "oneStep");
+    return super.getSlideNJumpMoves([x, y], steps, 1);
   }
 
   getPotentialAdvisorMoves(sq) {
@@ -310,9 +314,7 @@ export class JanggiRules extends ChessRules {
       // In the middle of a palace: 4 one-diagonal-step to check
       Array.prototype.push.apply(
         moves,
-        super.getSlideNJumpMoves([x, y],
-                                 ChessRules.steps[V.BISHOP],
-                                 "oneStep")
+        super.getSlideNJumpMoves([x, y], ChessRules.steps[V.BISHOP], 1)
       );
     }
     return moves;
@@ -391,7 +393,7 @@ export class JanggiRules extends ChessRules {
   isAttackedByPawn([x, y], color) {
     const shiftX = (color == 'w' ? 1 : -1); //shift from king
     if (super.isAttackedBySlideNJump(
-      [x, y], color, V.PAWN, [[shiftX, 0], [0, 1], [0, -1]], "oneStep")
+      [x, y], color, V.PAWN, [[shiftX, 0], [0, 1], [0, -1]], 1)
     ) {
       return true;
     }
@@ -428,7 +430,7 @@ export class JanggiRules extends ChessRules {
       }
     }
     return (
-      super.isAttackedBySlideNJump([x, y], color, V.KNIGHT, steps, "oneStep")
+      super.isAttackedBySlideNJump([x, y], color, V.KNIGHT, steps, 1)
     );
   }
 
@@ -450,7 +452,7 @@ export class JanggiRules extends ChessRules {
       }
     }
     return (
-      super.isAttackedBySlideNJump([x, y], color, V.ELEPHANT, steps, "oneStep")
+      super.isAttackedBySlideNJump([x, y], color, V.ELEPHANT, steps, 1)
     );
   }
 
diff --git a/client/src/variants/Joker.js b/client/src/variants/Joker.js
index fd302bbb..bc3a7f1b 100644
--- a/client/src/variants/Joker.js
+++ b/client/src/variants/Joker.js
@@ -11,8 +11,8 @@ export class JokerRules extends ChessRules {
     );
   }
 
-  static GenRandInitFen(randomness) {
-    const antikingFen = Antiking2Rules.GenRandInitFen(randomness);
+  static GenRandInitFen(options) {
+    const antikingFen = Antiking2Rules.GenRandInitFen(options);
     return antikingFen.replace('a', 'J').replace('A', 'j');
   }
 
@@ -48,7 +48,7 @@ export class JokerRules extends ChessRules {
 
   getPotentialJokerMoves([x, y]) {
     const moving =
-      super.getSlideNJumpMoves([x, y], V.steps[V.KNIGHT], "oneStep")
+      super.getSlideNJumpMoves([x, y], V.steps[V.KNIGHT], 1)
       .concat(super.getSlideNJumpMoves([x, y],
         V.steps[V.ROOK].concat(V.steps[V.BISHOP])));
     let swapping = [];
diff --git a/client/src/variants/Knightmate1.js b/client/src/variants/Knightmate1.js
index 80e7005b..7946d6a3 100644
--- a/client/src/variants/Knightmate1.js
+++ b/client/src/variants/Knightmate1.js
@@ -14,8 +14,8 @@ export class Knightmate1Rules extends ChessRules {
     return ([V.KING, V.COMMONER].includes(b[1]) ? "Knightmate/" : "") + b;
   }
 
-  static GenRandInitFen(randomness) {
-    return ChessRules.GenRandInitFen(randomness)
+  static GenRandInitFen(options) {
+    return ChessRules.GenRandInitFen(options)
       .replace(/n/g, 'c').replace(/N/g, 'C');
   }
 
@@ -30,10 +30,7 @@ export class Knightmate1Rules extends ChessRules {
 
   getPotentialCommonerMoves(sq) {
     return this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-      "oneStep"
-    );
+      sq, V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
   }
 
   getPotentialKingMoves(sq) {
@@ -53,22 +50,12 @@ export class Knightmate1Rules extends ChessRules {
 
   isAttackedByKing(sq, color) {
     return this.isAttackedBySlideNJump(
-      sq,
-      color,
-      V.KING,
-      V.steps[V.KNIGHT],
-      "oneStep"
-    );
+      sq, color, V.KING, V.steps[V.KNIGHT], 1);
   }
 
   isAttackedByCommoner(sq, color) {
     return this.isAttackedBySlideNJump(
-      sq,
-      color,
-      V.COMMONER,
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-      "oneStep"
-    );
+      sq, color, V.COMMONER, V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
   }
 
   static get VALUES() {
diff --git a/client/src/variants/Knightmate2.js b/client/src/variants/Knightmate2.js
index 3630b5c4..bbdd12d9 100644
--- a/client/src/variants/Knightmate2.js
+++ b/client/src/variants/Knightmate2.js
@@ -43,9 +43,9 @@ export class Knightmate2Rules extends ChessRules {
 
   scanKings() {}
 
-  static GenRandInitFen(randomness) {
+  static GenRandInitFen(options) {
     return (
-      ChessRules.GenRandInitFen(randomness)
+      ChessRules.GenRandInitFen(options)
       .replace(/k/g, 'c').replace(/K/g, 'C')
       .replace(/n/g, 'k').replace(/N/g, 'K')
     );
@@ -62,10 +62,7 @@ export class Knightmate2Rules extends ChessRules {
 
   getPotentialCommonerMoves(sq) {
     return this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-      "oneStep"
-    );
+      sq, V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
   }
 
   getPotentialKingMoves(sq) {
@@ -85,22 +82,12 @@ export class Knightmate2Rules extends ChessRules {
 
   isAttackedByKing(sq, color) {
     return this.isAttackedBySlideNJump(
-      sq,
-      color,
-      V.KING,
-      V.steps[V.KNIGHT],
-      "oneStep"
-    );
+      sq, color, V.KING, V.steps[V.KNIGHT], 1);
   }
 
   isAttackedByCommoner(sq, color) {
     return this.isAttackedBySlideNJump(
-      sq,
-      color,
-      V.COMMONER,
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-      "oneStep"
-    );
+      sq, color, V.COMMONER, V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
   }
 
   postPlay() {}
diff --git a/client/src/variants/Knightpawns.js b/client/src/variants/Knightpawns.js
index c8c1ceaa..bf3e7733 100644
--- a/client/src/variants/Knightpawns.js
+++ b/client/src/variants/Knightpawns.js
@@ -2,6 +2,10 @@ import { ChessRules } from "@/base_rules";
 
 export class KnightpawnsRules extends ChessRules {
 
+  static get Options() {
+    return null;
+  }
+
   static get PawnSpecs() {
     return Object.assign(
       {},
diff --git a/client/src/variants/Konane.js b/client/src/variants/Konane.js
index 80311817..7931347b 100644
--- a/client/src/variants/Konane.js
+++ b/client/src/variants/Konane.js
@@ -3,6 +3,10 @@ import { randInt } from "@/utils/alea";
 
 export class KonaneRules extends ChessRules {
 
+  static get Options() {
+    return null;
+  }
+
   static get HasFlags() {
     return false;
   }
diff --git a/client/src/variants/Koopa.js b/client/src/variants/Koopa.js
index a624eebb..38b3e885 100644
--- a/client/src/variants/Koopa.js
+++ b/client/src/variants/Koopa.js
@@ -216,9 +216,7 @@ export class KoopaRules extends ChessRules {
   getPotentialKingMoves(sq) {
     return (
       this.getSlideNJumpMoves(
-        sq,
-        V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-        "oneStep"
+        sq, V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1
       ).concat(super.getCastleMoves(sq, null, true, ['r']))
     );
   }
diff --git a/client/src/variants/Madrasi.js b/client/src/variants/Madrasi.js
index f0db5107..e16d78f5 100644
--- a/client/src/variants/Madrasi.js
+++ b/client/src/variants/Madrasi.js
@@ -25,8 +25,8 @@ export class MadrasiRules extends ChessRules {
         steps = V.steps[V.ROOK].concat(V.steps[V.BISHOP]);
         break;
     }
-    return super.isAttackedBySlideNJump(
-      sq, oppCol, piece, steps, [V.KING, V.PAWN, V.KNIGHT].includes(piece))
+    const nbSteps = [V.KING, V.PAWN, V.KNIGHT].includes(piece) ? 1 : null;
+    return super.isAttackedBySlideNJump(sq, oppCol, piece, steps, nbSteps);
   }
 
   getPotentialMovesFrom([x, y]) {
diff --git a/client/src/variants/Maharajah.js b/client/src/variants/Maharajah.js
index a49828b2..65523e7c 100644
--- a/client/src/variants/Maharajah.js
+++ b/client/src/variants/Maharajah.js
@@ -2,6 +2,18 @@ import { ChessRules } from "@/base_rules";
 
 export class MaharajahRules extends ChessRules {
 
+  static get Options() {
+    return {
+      check: [
+        {
+          label: "Random",
+          defaut: false,
+          variable: "random"
+        }
+      ]
+    };
+  }
+
   static get HasEnpassant() {
     return false;
   }
@@ -84,9 +96,10 @@ export class MaharajahRules extends ChessRules {
     }
   }
 
-  static GenRandInitFen(randomness) {
-    const sFen = ChessRules.GenRandInitFen(Math.max(randomness, 1));
-    return "3mm3/8/" + sFen.substring(18, 50);
+  static GenRandInitFen(options) {
+    const baseFen = ChessRules.GenRandInitFen(
+      { randomness: (options.random ? 1 : 0) });
+    return "3mm3/8/" + baseFen.substring(18, 50);
   }
 
   getFlagsFen() {
@@ -108,7 +121,7 @@ export class MaharajahRules extends ChessRules {
     let moves = super.getPotentialQueenMoves(sq);
     moves = moves.concat(super.getPotentialKnightMoves(sq));
     const otherJumpMoves =
-      super.getSlideNJumpMoves(sq, V.M_EXTRA_STEPS, "oneStep")
+      super.getSlideNJumpMoves(sq, V.M_EXTRA_STEPS, 1)
       .filter(m =>
         moves.every(mv => mv.end.x != m.end.x || mv.end.y != m.end.y));
     return moves.concat(otherJumpMoves);
diff --git a/client/src/variants/Makruk.js b/client/src/variants/Makruk.js
index 75fb1da2..b721273b 100644
--- a/client/src/variants/Makruk.js
+++ b/client/src/variants/Makruk.js
@@ -36,13 +36,13 @@ export class MakrukRules extends ChessRules {
     return 'f';
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
+  static GenRandInitFen(options) {
+    if (options.randomness == 0)
       return "rnbqkbnr/8/pppppppp/8/8/PPPPPPPP/8/RNBKQBNR w 0";
 
     let pieces = { w: new Array(8), b: new Array(8) };
     for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
+      if (c == 'b' && options.randomness == 1) {
         pieces['b'] = pieces['w'];
         break;
       }
@@ -95,18 +95,11 @@ export class MakrukRules extends ChessRules {
   getPotentialBishopMoves(sq) {
     const forward = (this.turn == 'w' ? -1 : 1);
     return this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.BISHOP].concat([ [forward, 0] ]),
-      "oneStep"
-    );
+      sq, V.steps[V.BISHOP].concat([ [forward, 0] ]), 1);
   }
 
   getPotentialQueenMoves(sq) {
-    return this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.BISHOP],
-      "oneStep"
-    );
+    return this.getSlideNJumpMoves(sq, V.steps[V.BISHOP], 1);
   }
 
   isAttacked(sq, color) {
@@ -118,32 +111,17 @@ export class MakrukRules extends ChessRules {
   isAttackedByBishop(sq, color) {
     const forward = (color == 'w' ? 1 : -1);
     return this.isAttackedBySlideNJump(
-      sq,
-      color,
-      V.BISHOP,
-      V.steps[V.BISHOP].concat([ [forward, 0] ]),
-      "oneStep"
-    );
+      sq, color, V.BISHOP, V.steps[V.BISHOP].concat([ [forward, 0] ]), 1);
   }
 
   isAttackedByQueen(sq, color) {
     return this.isAttackedBySlideNJump(
-      sq,
-      color,
-      V.QUEEN,
-      V.steps[V.BISHOP],
-      "oneStep"
-    );
+      sq, color, V.QUEEN, V.steps[V.BISHOP], 1);
   }
 
   isAttackedByPromoted(sq, color) {
     return super.isAttackedBySlideNJump(
-      sq,
-      color,
-      V.PROMOTED,
-      V.steps[V.BISHOP],
-      "oneStep"
-    );
+      sq, color, V.PROMOTED, V.steps[V.BISHOP], 1);
   }
 
   static get VALUES() {
diff --git a/client/src/variants/Maxima.js b/client/src/variants/Maxima.js
index 05df0bd9..df781b9e 100644
--- a/client/src/variants/Maxima.js
+++ b/client/src/variants/Maxima.js
@@ -4,6 +4,10 @@ import { shuffle } from "@/utils/alea";
 
 export class MaximaRules extends ChessRules {
 
+  static get Options() {
+    return null;
+  }
+
   static get HasFlags() {
     return false;
   }
@@ -192,7 +196,7 @@ export class MaximaRules extends ChessRules {
       if (piece == V.KING) j = j % V.size.y;
       while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
         moves.push(this.getBasicMove(initSquare, [i, j]));
-        if (!!oneStep) continue outerLoop;
+        if (oneStep) continue outerLoop;
         i += step[0];
         j += step[1];
       }
@@ -450,14 +454,8 @@ export class MaximaRules extends ChessRules {
   }
 
   getPotentialGuardMoves(sq) {
-    return (
-      this.getSlideNJumpMoves(
-        sq,
-        V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-        "oneStep",
-        null
-      )
-    );
+    return this.getSlideNJumpMoves(
+      sq, V.steps[V.ROOK].concat(V.steps[V.BISHOP]), "oneStep");
   }
 
   getNextMageSteps(step) {
@@ -679,15 +677,8 @@ export class MaximaRules extends ChessRules {
   }
 
   isAttackedByGuard(sq, color) {
-    return (
-      super.isAttackedBySlideNJump(
-        sq,
-        color,
-        V.GUARD,
-        V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-        "oneStep"
-      )
-    );
+    return super.isAttackedBySlideNJump(
+      sq, color, V.GUARD, V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
   }
 
   getNextMageCheck(step) {
diff --git a/client/src/variants/Mesmer.js b/client/src/variants/Mesmer.js
index ec40b482..c522e733 100644
--- a/client/src/variants/Mesmer.js
+++ b/client/src/variants/Mesmer.js
@@ -36,8 +36,8 @@ export class MesmerRules extends ChessRules {
     );
   }
 
-  static GenRandInitFen(randomness) {
-    const antikingFen = Antiking2Rules.GenRandInitFen(randomness);
+  static GenRandInitFen(options) {
+    const antikingFen = Antiking2Rules.GenRandInitFen(options);
     return antikingFen.replace('a', 'M').replace('A', 'm') + " -";
   }
 
@@ -113,7 +113,7 @@ export class MesmerRules extends ChessRules {
       piece == V.KING
         // No castling with enemy king (...yes, should eat it but...)
         ? super.getSlideNJumpMoves(
-          [x, y], V.steps[V.ROOK].concat(V.steps[V.BISHOP]), "oneStep")
+          [x, y], V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1)
         : super.getPotentialMovesFrom([x, y]);
     return moves;
   }
diff --git a/client/src/variants/Minixiangqi.js b/client/src/variants/Minixiangqi.js
index fc1d164e..d8f6ebba 100644
--- a/client/src/variants/Minixiangqi.js
+++ b/client/src/variants/Minixiangqi.js
@@ -39,7 +39,7 @@ export class MinixiangqiRules extends XiangqiRules {
     if (!lastRank) steps.push([shiftX, 0]);
     if (y > 0) steps.push([0, -1]);
     if (y < 9) steps.push([0, 1]);
-    return super.getSlideNJumpMoves([x, y], steps, "oneStep");
+    return super.getSlideNJumpMoves([x, y], steps, 1);
   }
 
   insidePalace(x, y, c) {
diff --git a/client/src/variants/Monocolor.js b/client/src/variants/Monocolor.js
index 1e263699..1478f482 100644
--- a/client/src/variants/Monocolor.js
+++ b/client/src/variants/Monocolor.js
@@ -156,9 +156,9 @@ export class MonocolorRules extends ChessRules {
     return "1/2";
   }
 
-  static GenRandInitFen(randomness) {
+  static GenRandInitFen(options) {
     // Remove the en-passant + castle part of the FEN
-    let fen = ChessRules.GenRandInitFen(randomness).slice(0, -6);
+    let fen = ChessRules.GenRandInitFen(options).slice(0, -6);
     // Replace kings with queens
     fen = fen.replace("k", "q").replace("K", "Q");
     // Move pawns up:
diff --git a/client/src/variants/Monster.js b/client/src/variants/Monster.js
index cb29adae..bbba3193 100644
--- a/client/src/variants/Monster.js
+++ b/client/src/variants/Monster.js
@@ -3,21 +3,53 @@ import { randInt } from "@/utils/alea";
 
 export class MonsterRules extends ChessRules {
 
+  static get Options() {
+    return {
+      check: [
+        {
+          label: "Random",
+          defaut: false,
+          variable: "random"
+        }
+      ],
+      select: [
+        {
+          label: "Number of pawns",
+          variable: "pawnsCount",
+          defaut: 4,
+          options: [
+            { label: "Two", value: 2 },
+            { label: "Four", value: 4 },
+            { label: "Six", value: 6 }
+          ]
+        }
+      ]
+    };
+  }
+
+  static AbbreviateOptions(opts) {
+    return opts["pawnsCount"];
+  }
+
   static IsGoodFlags(flags) {
     // Only black can castle
     return !!flags.match(/^[a-z]{2,2}$/);
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 2) randomness--;
-    const fen = ChessRules.GenRandInitFen(randomness);
+  static GenRandInitFen(options) {
+    const baseFen = ChessRules.GenRandInitFen(
+      { randomness: (options.random ? 1 : 0) });
+    let pawnsLine = "";
+    switch (options.pawnsCount) {
+      case 2: pawnsLine = "3PP3"; break;
+      case 4: pawnsLine = "2PPPP2"; break;
+      case 6: pawnsLine = "1PPPPPP1"; break;
+    }
     return (
       // 26 first chars are 6 rows + 6 slashes
-      fen.substr(0, 26)
+      baseFen.substr(0, 26) + pawnsLine + "/4K3 w 0 " +
       // En passant available, and "half-castle"
-      .concat("1PPPPPP1/4K3 w 0 ")
-      .concat(fen.substr(-6, 2))
-      .concat(" -")
+      baseFen.substr(-6, 2) + " -"
     );
   }
 
@@ -40,10 +72,7 @@ export class MonsterRules extends ChessRules {
     if (this.getColor(x, y) == 'b') return super.getPotentialKingMoves([x, y]);
     // White doesn't castle:
     return this.getSlideNJumpMoves(
-      [x, y],
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-      "oneStep"
-    );
+      [x, y], V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
   }
 
   isAttacked() {
diff --git a/client/src/variants/Musketeer.js b/client/src/variants/Musketeer.js
index 14ba9192..e10457fc 100644
--- a/client/src/variants/Musketeer.js
+++ b/client/src/variants/Musketeer.js
@@ -323,31 +323,6 @@ export class MusketeerRules extends ChessRules {
     return moves;
   }
 
-  getSlideNJumpMoves([x, y], steps, nbSteps) {
-    let moves = [];
-    outerLoop: for (let step of steps) {
-      let i = x + step[0];
-      let j = y + step[1];
-      let stepCounter = 0;
-      while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
-        moves.push(this.getBasicMove([x, y], [i, j]));
-        stepCounter++;
-        if (
-          !!nbSteps &&
-          // Next condition to remain compatible with super method
-          (stepCounter >= nbSteps || isNaN(parseInt(nbSteps, 10)))
-        ) {
-          continue outerLoop;
-        }
-        i += step[0];
-        j += step[1];
-      }
-      if (V.OnBoard(i, j) && this.canTake([x, y], [i, j]))
-        moves.push(this.getBasicMove([x, y], [i, j]));
-    }
-    return moves;
-  }
-
   // All types of leaps used here:
   static get Leap2Ortho() {
     return [ [-2, 0], [0, -2], [2, 0], [0, 2] ];
@@ -385,13 +360,13 @@ export class MusketeerRules extends ChessRules {
     const steps =
       V.steps[V.ROOK].concat(V.steps[V.BISHOP])
       .concat(V.Leap2Ortho).concat(V.HorizontalKnight);
-    return super.getSlideNJumpMoves(sq, steps, "oneStep");
+    return super.getSlideNJumpMoves(sq, steps, 1);
   }
 
   getPotentialUnicornMoves(sq) {
     return (
       super.getPotentialKnightMoves(sq)
-      .concat(super.getSlideNJumpMoves(sq, V.CamelSteps, "oneStep"))
+      .concat(super.getSlideNJumpMoves(sq, V.CamelSteps, 1))
     );
   }
 
@@ -400,20 +375,20 @@ export class MusketeerRules extends ChessRules {
       V.steps[V.ROOK].concat(V.steps[V.BISHOP])
       .concat(V.Leap2Ortho)
       .concat(V.Leap2Diago);
-    return super.getSlideNJumpMoves(sq, steps, "oneStep");
+    return super.getSlideNJumpMoves(sq, steps, 1);
   }
 
   getPotentialHawkMoves(sq) {
     const steps =
       V.Leap2Ortho.concat(V.Leap2Diago)
       .concat(V.Leap3Ortho).concat(V.Leap3Diago);
-    return super.getSlideNJumpMoves(sq, steps, "oneStep");
+    return super.getSlideNJumpMoves(sq, steps, 1);
   }
 
   getPotentialFortressMoves(sq) {
     const steps = V.Leap2Ortho.concat(V.VerticalKnight)
     return (
-      super.getSlideNJumpMoves(sq, steps, "oneStep")
+      super.getSlideNJumpMoves(sq, steps, 1)
       .concat(this.getSlideNJumpMoves(sq, V.steps[V.BISHOP], 3))
     );
   }
@@ -421,7 +396,7 @@ export class MusketeerRules extends ChessRules {
   getPotentialSpiderMoves(sq) {
     const steps = V.Leap2Ortho.concat(V.steps[V.KNIGHT])
     return (
-      super.getSlideNJumpMoves(sq, steps, "oneStep")
+      super.getSlideNJumpMoves(sq, steps, 1)
       .concat(this.getSlideNJumpMoves(sq, V.steps[V.BISHOP], 2))
     );
   }
@@ -496,37 +471,10 @@ export class MusketeerRules extends ChessRules {
     return false;
   }
 
-  // Modify because of the limiyted steps options of some of the pieces here
-  isAttackedBySlideNJump([x, y], color, piece, steps, nbSteps) {
-    if (!!nbSteps && isNaN(parseInt(nbSteps, 10))) nbSteps = 1;
-    for (let step of steps) {
-      let rx = x + step[0],
-          ry = y + step[1];
-      let stepCounter = 1;
-      while (
-        V.OnBoard(rx, ry) && this.board[rx][ry] == V.EMPTY &&
-        (!nbSteps || stepCounter < nbSteps)
-      ) {
-        rx += step[0];
-        ry += step[1];
-        stepCounter++;
-      }
-      if (
-        V.OnBoard(rx, ry) &&
-        this.board[rx][ry] != V.EMPTY &&
-        this.getPiece(rx, ry) == piece &&
-        this.getColor(rx, ry) == color
-      ) {
-        return true;
-      }
-    }
-    return false;
-  }
-
   isAttackedByLeopard(sq, color) {
     return (
       super.isAttackedBySlideNJump(
-        sq, color, V.LEOPARD, V.steps[V.KNIGHT], "oneStep") ||
+        sq, color, V.LEOPARD, V.steps[V.KNIGHT], 1) ||
       this.isAttackedBySlideNJump(sq, color, V.LEOPARD, V.steps[V.BISHOP], 2)
     );
   }
@@ -535,13 +483,13 @@ export class MusketeerRules extends ChessRules {
     const steps =
       V.steps[V.ROOK].concat(V.steps[V.BISHOP])
       .concat(V.Leap2Ortho).concat(V.HorizontalKnight);
-    return super.isAttackedBySlideNJump(sq, color, V.CANNON, steps, "oneStep");
+    return super.isAttackedBySlideNJump(sq, color, V.CANNON, steps, 1);
   }
 
   isAttackedByUnicorn(sq, color) {
     const steps = V.steps[V.KNIGHT].concat(V.CamelSteps)
     return (
-      super.isAttackedBySlideNJump(sq, color, V.UNICORN, steps, "oneStep")
+      super.isAttackedBySlideNJump(sq, color, V.UNICORN, steps, 1)
     );
   }
 
@@ -551,7 +499,7 @@ export class MusketeerRules extends ChessRules {
       .concat(V.Leap2Ortho)
       .concat(V.Leap2Diago);
     return (
-      super.isAttackedBySlideNJump(sq, color, V.ELEPHANT, steps, "oneStep")
+      super.isAttackedBySlideNJump(sq, color, V.ELEPHANT, steps, 1)
     );
   }
 
@@ -559,13 +507,13 @@ export class MusketeerRules extends ChessRules {
     const steps =
       V.Leap2Ortho.concat(V.Leap2Diago)
       .concat(V.Leap3Ortho).concat(V.Leap3Diago);
-    return super.isAttackedBySlideNJump(sq, color, V.HAWK, steps, "oneStep");
+    return super.isAttackedBySlideNJump(sq, color, V.HAWK, steps, 1);
   }
 
   isAttackedByFortress(sq, color) {
     const steps = V.Leap2Ortho.concat(V.VerticalKnight)
     return (
-      super.isAttackedBySlideNJump(sq, color, V.FORTRESS, steps, "oneStep") ||
+      super.isAttackedBySlideNJump(sq, color, V.FORTRESS, steps, 1) ||
       this.isAttackedBySlideNJump(sq, color, V.FORTRESS, V.steps[V.BISHOP], 3)
     );
   }
@@ -573,7 +521,7 @@ export class MusketeerRules extends ChessRules {
   isAttackedBySpider(sq, color) {
     const steps = V.Leap2Ortho.concat(V.steps[V.KNIGHT])
     return (
-      super.isAttackedBySlideNJump(sq, color, V.SPIDER, steps, "oneStep") ||
+      super.isAttackedBySlideNJump(sq, color, V.SPIDER, steps, 1) ||
       this.isAttackedBySlideNJump(sq, color, V.SPIDER, V.steps[V.BISHOP], 2)
     );
   }
diff --git a/client/src/variants/Newzealand.js b/client/src/variants/Newzealand.js
index eb7d6251..3d78cbad 100644
--- a/client/src/variants/Newzealand.js
+++ b/client/src/variants/Newzealand.js
@@ -3,6 +3,7 @@ import { ChessRules } from "@/base_rules";
 // NOTE: a lot copy-pasted from Hoppelpoppel
 export class NewzealandRules extends ChessRules {
 
+  // TODO: merge with base_rules.js
   getSlideNJumpMoves_([x, y], steps, oneStep, options) {
     options = options || {};
     let moves = [];
@@ -11,7 +12,7 @@ export class NewzealandRules extends ChessRules {
       let j = y + step[1];
       while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
         if (!options.onlyTake) moves.push(this.getBasicMove([x, y], [i, j]));
-        if (!!oneStep) continue outerLoop;
+        if (oneStep) continue outerLoop;
         i += step[0];
         j += step[1];
       }
@@ -45,21 +46,12 @@ export class NewzealandRules extends ChessRules {
 
   isAttackedByKnight([x, y], color) {
     return super.isAttackedBySlideNJump(
-      [x, y],
-      color,
-      V.KNIGHT,
-      V.steps[V.ROOK]
-    );
+      [x, y], color, V.KNIGHT, V.steps[V.ROOK]);
   }
 
   isAttackedByRook([x, y], color) {
     return super.isAttackedBySlideNJump(
-      [x, y],
-      color,
-      V.ROOK,
-      V.steps[V.KNIGHT],
-      "oneStep"
-    );
+      [x, y], color, V.ROOK, V.steps[V.KNIGHT], 1);
   }
 
 };
diff --git a/client/src/variants/Omega.js b/client/src/variants/Omega.js
index a688a2ea..29b58e53 100644
--- a/client/src/variants/Omega.js
+++ b/client/src/variants/Omega.js
@@ -140,8 +140,8 @@ export class OmegaRules extends ChessRules {
     );
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0) {
+  static GenRandInitFen(options) {
+    if (options.randomness == 0) {
       return (
         "wxxxxxxxxxxw/xcrnbqkbnrcx/xppppppppppx/x91x/x91x/x91x/" +
         "x91x/x91x/x91x/xPPPPPPPPPPx/xCRNBQKBNRCx/WxxxxxxxxxxW " +
@@ -153,7 +153,7 @@ export class OmegaRules extends ChessRules {
     let flags = "";
     // Shuffle pieces on first (and last rank if randomness == 2)
     for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
+      if (c == 'b' && options.randomness == 1) {
         pieces['b'] = pieces['w'];
         flags += flags;
         break;
@@ -320,11 +320,11 @@ export class OmegaRules extends ChessRules {
   }
 
   getPotentialChampionMoves(sq) {
-    return this.getSlideNJumpMoves(sq, V.steps[V.CHAMPION], "oneStep");
+    return this.getSlideNJumpMoves(sq, V.steps[V.CHAMPION], 1);
   }
 
   getPotentialWizardMoves(sq) {
-    return this.getSlideNJumpMoves(sq, V.steps[V.WIZARD], "oneStep");
+    return this.getSlideNJumpMoves(sq, V.steps[V.WIZARD], 1);
   }
 
   getCastleMoves([x, y]) {
@@ -346,14 +346,14 @@ export class OmegaRules extends ChessRules {
   isAttackedByWizard(sq, color) {
     return (
       this.isAttackedBySlideNJump(
-        sq, color, V.WIZARD, V.steps[V.WIZARD], "oneStep")
+        sq, color, V.WIZARD, V.steps[V.WIZARD], 1)
     );
   }
 
   isAttackedByChampion(sq, color) {
     return (
       this.isAttackedBySlideNJump(
-        sq, color, V.CHAMPION, V.steps[V.CHAMPION], "oneStep")
+        sq, color, V.CHAMPION, V.steps[V.CHAMPION], 1)
     );
   }
 
diff --git a/client/src/variants/Orda.js b/client/src/variants/Orda.js
index 1fd5c1d3..4bca5496 100644
--- a/client/src/variants/Orda.js
+++ b/client/src/variants/Orda.js
@@ -24,8 +24,8 @@ export class OrdaRules extends ChessRules {
     return b;
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
+  static GenRandInitFen(options) {
+    if (options.randomness == 0)
       return "lhaykahl/8/pppppppp/8/8/8/PPPPPPPP/RNBQKBNR w 0 ah -";
 
     // Mapping kingdom --> horde:
@@ -37,7 +37,7 @@ export class OrdaRules extends ChessRules {
       'k': 'k'
     };
 
-    const baseFen = ChessRules.GenRandInitFen(randomness);
+    const baseFen = ChessRules.GenRandInitFen(options);
     return (
       baseFen.substr(0, 8).split('').map(p => piecesMap[p]).join('') +
       // Skip 3 first rows + black castle flags
@@ -89,6 +89,7 @@ export class OrdaRules extends ChessRules {
     return [];
   }
 
+  // TODO: merge this extension into base_rules.js
   getSlideNJumpMoves([x, y], steps, oneStep, options) {
     options = options || {};
     let moves = [];
@@ -97,7 +98,7 @@ export class OrdaRules extends ChessRules {
       let j = y + step[1];
       while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
         if (!options.onlyTake) moves.push(this.getBasicMove([x, y], [i, j]));
-        if (!!oneStep) continue outerLoop;
+        if (oneStep) continue outerLoop;
         i += step[0];
         j += step[1];
       }
@@ -109,60 +110,36 @@ export class OrdaRules extends ChessRules {
 
   getPotentialLancerMoves(sq) {
     const onlyMoves = this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.KNIGHT],
-      "oneStep",
-      { onlyMove: true }
-    );
+      sq, V.steps[V.KNIGHT], "oneStep", { onlyMove: true });
     const onlyTakes = this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.ROOK],
-      null,
-      { onlyTake: true }
-    );
+      sq, V.steps[V.ROOK], null, { onlyTake: true });
     return onlyMoves.concat(onlyTakes);
   }
 
   getPotentialArcherMoves(sq) {
     const onlyMoves = this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.KNIGHT],
-      "oneStep",
-      { onlyMove: true }
-    );
+      sq, V.steps[V.KNIGHT], "oneStep", { onlyMove: true });
     const onlyTakes = this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.BISHOP],
-      null,
-      { onlyTake: true }
-    );
+      sq, V.steps[V.BISHOP], null, { onlyTake: true });
     return onlyMoves.concat(onlyTakes);
   }
 
   getPotentialKheshigMoves(sq) {
-    return super.getSlideNJumpMoves(
-      sq,
-      V.steps[V.KNIGHT].concat(V.steps[V.ROOK]).concat(V.steps[V.BISHOP]),
-      "oneStep"
-    );
+    const steps =
+      V.steps[V.KNIGHT].concat(V.steps[V.ROOK]).concat(V.steps[V.BISHOP]);
+    return super.getSlideNJumpMoves(sq, steps, 1);
   }
 
   getPotentialYurtMoves(sq) {
     return super.getSlideNJumpMoves(
-      sq,
-      V.steps[V.BISHOP].concat([ [1, 0] ]),
-      "oneStep"
-    );
+      sq, V.steps[V.BISHOP].concat([ [1, 0] ]), 1);
   }
 
   getPotentialKingMoves([x, y]) {
     if (this.getColor(x, y) == 'w') return super.getPotentialKingMoves([x, y]);
     // Horde doesn't castle:
     return super.getSlideNJumpMoves(
-      [x, y],
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-      "oneStep"
-    );
+      [x, y], V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
   }
 
   isAttacked(sq, color) {
@@ -193,23 +170,14 @@ export class OrdaRules extends ChessRules {
   }
 
   isAttackedByKheshig(sq, color) {
-    return super.isAttackedBySlideNJump(
-      sq,
-      color,
-      V.KHESHIG,
-      V.steps[V.KNIGHT].concat(V.steps[V.ROOK]).concat(V.steps[V.BISHOP]),
-      "oneStep"
-    );
+    const steps =
+      V.steps[V.KNIGHT].concat(V.steps[V.ROOK]).concat(V.steps[V.BISHOP]);
+    return super.isAttackedBySlideNJump(sq, color, V.KHESHIG, steps, 1);
   }
 
   isAttackedByYurt(sq, color) {
     return super.isAttackedBySlideNJump(
-      sq,
-      color,
-      V.YURT,
-      V.steps[V.BISHOP].concat([ [1, 0] ]),
-      "oneStep"
-    );
+      sq, color, V.YURT, V.steps[V.BISHOP].concat([ [1, 0] ]), 1);
   }
 
   updateCastleFlags(move, piece) {
diff --git a/client/src/variants/Ordamirror.js b/client/src/variants/Ordamirror.js
index 8176b957..21aebaaf 100644
--- a/client/src/variants/Ordamirror.js
+++ b/client/src/variants/Ordamirror.js
@@ -25,14 +25,14 @@ export class OrdamirrorRules extends OrdaRules {
     return "Orda/" + b;
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
+  static GenRandInitFen(options) {
+    if (options.randomness == 0)
       return "lhafkahl/8/pppppppp/8/8/PPPPPPPP/8/LHAFKAHL w 0 ah -";
 
     let pieces = { w: new Array(8), b: new Array(8) };
     // Shuffle pieces on first (and last rank if randomness == 2)
     for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
+      if (c == 'b' && options.randomness == 1) {
         pieces['b'] = pieces['w'];
         break;
       }
@@ -106,17 +106,9 @@ export class OrdamirrorRules extends OrdaRules {
 
   getPotentialFalconMoves(sq) {
     const onlyMoves = this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-      null,
-      { onlyMove: true }
-    );
+      sq, V.steps[V.ROOK].concat(V.steps[V.BISHOP]), null, { onlyMove: true });
     const onlyTakes = this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.KNIGHT],
-      "oneStep",
-      { onlyTake: true }
-    );
+      sq, V.steps[V.KNIGHT], "oneStep", { onlyTake: true });
     return onlyMoves.concat(onlyTakes);
   }
 
@@ -133,7 +125,7 @@ export class OrdamirrorRules extends OrdaRules {
 
   isAttackedByFalcon(sq, color) {
     return this.isAttackedBySlideNJump(
-      sq, color, V.FALCON, V.steps[V.KNIGHT], "oneStep");
+      sq, color, V.FALCON, V.steps[V.KNIGHT], 1);
   }
 
   static get VALUES() {
diff --git a/client/src/variants/Otage.js b/client/src/variants/Otage.js
index 79157157..caf55c9c 100644
--- a/client/src/variants/Otage.js
+++ b/client/src/variants/Otage.js
@@ -197,9 +197,9 @@ export class OtageRules extends ChessRules {
     this.pawnFlags = flags[1];
   }
 
-  static GenRandInitFen(randomness) {
+  static GenRandInitFen(options) {
     // Add 16 pawns flags:
-    return ChessRules.GenRandInitFen(randomness)
+    return ChessRules.GenRandInitFen(options)
       .slice(0, -2) + "1111111111111111 -";
   }
 
@@ -390,10 +390,7 @@ export class OtageRules extends ChessRules {
         break;
       case V.KING:
         baseMoves = this.getSlideNJumpMoves(
-          [x, y],
-          V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-          "oneStep"
-        );
+          [x, y], V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
         if (!noCastle && this.castleFlags[this.turn].some(v => v < V.size.y))
           baseMoves = baseMoves.concat(this.getCastleMoves([x, y]));
         break;
diff --git a/client/src/variants/Pacifist1.js b/client/src/variants/Pacifist1.js
index 37d0521f..e595b0da 100644
--- a/client/src/variants/Pacifist1.js
+++ b/client/src/variants/Pacifist1.js
@@ -154,21 +154,9 @@ export class Pacifist1Rules extends ChessRules {
     return moves;
   }
 
-  getSlideNJumpMoves([x, y], steps, oneStep) {
-    let moves = [];
-    outerLoop: for (let loop = 0; loop < steps.length; loop++) {
-      const step = steps[loop];
-      let i = x + step[0];
-      let j = y + step[1];
-      while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
-        moves.push(this.getBasicMove([x, y], [i, j]));
-        if (oneStep) continue outerLoop;
-        i += step[0];
-        j += step[1];
-      }
-      // No captures
-    }
-    return moves;
+  canTake() {
+    // No captures
+    return false;
   }
 
   underCheck(color) {
diff --git a/client/src/variants/Pacosako.js b/client/src/variants/Pacosako.js
index 4745f631..0462d2db 100644
--- a/client/src/variants/Pacosako.js
+++ b/client/src/variants/Pacosako.js
@@ -199,9 +199,9 @@ export class PacosakoRules extends ChessRules {
     );
   }
 
-  static GenRandInitFen(randomness) {
+  static GenRandInitFen(options) {
     // Add 16 pawns flags + empty umove:
-    return ChessRules.GenRandInitFen(randomness)
+    return ChessRules.GenRandInitFen(options)
       .slice(0, -2) + "1111111111111111 - -";
   }
 
diff --git a/client/src/variants/Pandemonium1.js b/client/src/variants/Pandemonium1.js
index 579ee9ce..aef9c06a 100644
--- a/client/src/variants/Pandemonium1.js
+++ b/client/src/variants/Pandemonium1.js
@@ -25,8 +25,8 @@ export class Pandemonium1Rules extends Pandemonium2Rules {
     return true;
   }
 
-  static GenRandInitFen(randomness) {
-    const baseFen = Pandemonium2Rules.GenRandInitFen(randomness)
+  static GenRandInitFen(options) {
+    const baseFen = Pandemonium2Rules.GenRandInitFen(options)
     return baseFen.substr(0, 22) + "91/91/" + baseFen.substr(22);
   }
 
diff --git a/client/src/variants/Pandemonium2.js b/client/src/variants/Pandemonium2.js
index 7951608a..4a980832 100644
--- a/client/src/variants/Pandemonium2.js
+++ b/client/src/variants/Pandemonium2.js
@@ -139,8 +139,8 @@ export class Pandemonium2Rules extends ChessRules {
     return counts.join("");
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0) {
+  static GenRandInitFen(options) {
+    if (options.randomness == 0) {
       return (
         "rnbqkmcbnr/pppppppppp/91/91/91/91/PPPPPPPPPP/RNBQKMCBNR " +
         "w 0 ajaj - 00000000000000"
@@ -150,7 +150,7 @@ export class Pandemonium2Rules extends ChessRules {
     let pieces = { w: new Array(10), b: new Array(10) };
     let flags = "";
     for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
+      if (c == 'b' && options.randomness == 1) {
         pieces['b'] = pieces['w'];
         flags += flags;
         break;
@@ -379,39 +379,36 @@ export class Pandemonium2Rules extends ChessRules {
 
   getPotentialMarshalMoves(sq) {
     return this.getSlideNJumpMoves(sq, V.steps[V.ROOK]).concat(
-      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep")
+      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], 1)
     );
   }
 
   getPotentialCardinalMoves(sq) {
     return this.getSlideNJumpMoves(sq, V.steps[V.BISHOP]).concat(
-      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep")
+      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], 1)
     );
   }
 
   getPotentialScepterMoves(sq) {
     const steps =
       V.steps[V.KNIGHT].concat(V.steps[V.BISHOP]).concat(V.steps[V.ROOK]);
-    return this.getSlideNJumpMoves(sq, steps, "oneStep");
+    return this.getSlideNJumpMoves(sq, steps, 1);
   }
 
   getPotentialHorseMoves(sq) {
     return this.getSlideNJumpMoves(sq, V.steps[V.BISHOP]).concat(
-      this.getSlideNJumpMoves(sq, V.steps[V.ROOK], "oneStep"));
+      this.getSlideNJumpMoves(sq, V.steps[V.ROOK], 1));
   }
 
   getPotentialDragonMoves(sq) {
     return this.getSlideNJumpMoves(sq, V.steps[V.ROOK]).concat(
-      this.getSlideNJumpMoves(sq, V.steps[V.BISHOP], "oneStep"));
+      this.getSlideNJumpMoves(sq, V.steps[V.BISHOP], 1));
   }
 
   getPotentialKingMoves(sq) {
     // Initialize with normal moves
     let moves = this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-      "oneStep"
-    );
+      sq, V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
     const c = this.turn;
     if (
       this.castleFlags[c][0] < V.size.y ||
@@ -469,7 +466,7 @@ export class Pandemonium2Rules extends ChessRules {
     const steps =
       V.steps[V.KNIGHT].concat(V.steps[V.ROOK]).concat(V.steps[V.BISHOP]);
     return (
-      super.isAttackedBySlideNJump(sq, color, V.SCEPTER, steps, "oneStep")
+      super.isAttackedBySlideNJump(sq, color, V.SCEPTER, steps, 1)
     );
   }
 
@@ -477,7 +474,7 @@ export class Pandemonium2Rules extends ChessRules {
     return (
       super.isAttackedBySlideNJump(sq, color, V.HORSE, V.steps[V.BISHOP]) ||
       super.isAttackedBySlideNJump(
-        sq, color, V.HORSE, V.steps[V.ROOK], "oneStep")
+        sq, color, V.HORSE, V.steps[V.ROOK], 1)
     );
   }
 
@@ -485,7 +482,7 @@ export class Pandemonium2Rules extends ChessRules {
     return (
       super.isAttackedBySlideNJump(sq, color, V.DRAGON, V.steps[V.ROOK]) ||
       super.isAttackedBySlideNJump(
-        sq, color, V.DRAGON, V.steps[V.BISHOP], "oneStep")
+        sq, color, V.DRAGON, V.steps[V.BISHOP], 1)
     );
   }
 
@@ -493,12 +490,7 @@ export class Pandemonium2Rules extends ChessRules {
     return (
       super.isAttackedBySlideNJump(sq, color, V.MARSHAL, V.steps[V.ROOK]) ||
       super.isAttackedBySlideNJump(
-        sq,
-        color,
-        V.MARSHAL,
-        V.steps[V.KNIGHT],
-        "oneStep"
-      )
+        sq, color, V.MARSHAL, V.steps[V.KNIGHT], 1)
     );
   }
 
@@ -506,12 +498,7 @@ export class Pandemonium2Rules extends ChessRules {
     return (
       super.isAttackedBySlideNJump(sq, color, V.CARDINAL, V.steps[V.BISHOP]) ||
       super.isAttackedBySlideNJump(
-        sq,
-        color,
-        V.CARDINAL,
-        V.steps[V.KNIGHT],
-        "oneStep"
-      )
+        sq, color, V.CARDINAL, V.steps[V.KNIGHT], 1)
     );
   }
 
diff --git a/client/src/variants/Parachute.js b/client/src/variants/Parachute.js
index 631301c9..35ca6fbc 100644
--- a/client/src/variants/Parachute.js
+++ b/client/src/variants/Parachute.js
@@ -2,6 +2,11 @@ import { ChessRules, PiPo, Move } from "@/base_rules";
 
 export class ParachuteRules extends ChessRules {
 
+  static get Options() {
+    // TODO: later, allow variant, placing piece giving check maybe...
+    return null;
+  }
+
   static get HasFlags() {
     return false;
   }
diff --git a/client/src/variants/Pawnmassacre.js b/client/src/variants/Pawnmassacre.js
index 1fe61cbe..c08b585b 100644
--- a/client/src/variants/Pawnmassacre.js
+++ b/client/src/variants/Pawnmassacre.js
@@ -10,9 +10,9 @@ export class PawnmassacreRules extends ChessRules {
     return true;
   }
 
-  static GenRandInitFen(randomness) {
+  static GenRandInitFen(options) {
     const bFen =
-      ChessRules.GenRandInitFen(randomness)
+      ChessRules.GenRandInitFen(options)
       // Remove castle flags
       .slice(0, -6).concat("-");
     const splitIdx = bFen.indexOf(' ');
diff --git a/client/src/variants/Pawns.js b/client/src/variants/Pawns.js
index b3e84ea9..fdecf0a4 100644
--- a/client/src/variants/Pawns.js
+++ b/client/src/variants/Pawns.js
@@ -2,6 +2,10 @@ import { ChessRules } from "@/base_rules";
 
 export class PawnsRules extends ChessRules {
 
+  static get Options() {
+    return null;
+  }
+
   static get PawnSpecs() {
     return Object.assign(
       {},
diff --git a/client/src/variants/Pawnsking.js b/client/src/variants/Pawnsking.js
index bce2fe75..27fc90fe 100644
--- a/client/src/variants/Pawnsking.js
+++ b/client/src/variants/Pawnsking.js
@@ -2,6 +2,10 @@ import { ChessRules } from "@/base_rules";
 
 export class PawnskingRules extends ChessRules {
 
+  static get Options() {
+    return null;
+  }
+
   static get PawnSpecs() {
     return Object.assign(
       {},
diff --git a/client/src/variants/Perfect.js b/client/src/variants/Perfect.js
index 0c5e6e11..65334e2a 100644
--- a/client/src/variants/Perfect.js
+++ b/client/src/variants/Perfect.js
@@ -58,19 +58,19 @@ export class PerfectRules extends ChessRules {
 
   getPotentialAmazonMoves(sq) {
     return super.getPotentialQueenMoves(sq).concat(
-      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep")
+      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], 1)
     );
   }
 
   getPotentialEmpressMoves(sq) {
     return this.getSlideNJumpMoves(sq, V.steps[V.ROOK]).concat(
-      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep")
+      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], 1)
     );
   }
 
   getPotentialPrincessMoves(sq) {
     return this.getSlideNJumpMoves(sq, V.steps[V.BISHOP]).concat(
-      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep")
+      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], 1)
     );
   }
 
@@ -87,39 +87,21 @@ export class PerfectRules extends ChessRules {
     return (
       this.isAttackedBySlideNJump(sq, color, V.AMAZON, V.steps[V.BISHOP]) ||
       this.isAttackedBySlideNJump(sq, color, V.AMAZON, V.steps[V.ROOK]) ||
-      this.isAttackedBySlideNJump(
-        sq,
-        color,
-        V.AMAZON,
-        V.steps[V.KNIGHT],
-        "oneStep"
-      )
+      this.isAttackedBySlideNJump(sq, color, V.AMAZON, V.steps[V.KNIGHT], 1)
     );
   }
 
   isAttackedByEmpress(sq, color) {
     return (
       this.isAttackedBySlideNJump(sq, color, V.EMPRESS, V.steps[V.ROOK]) ||
-      this.isAttackedBySlideNJump(
-        sq,
-        color,
-        V.EMPRESS,
-        V.steps[V.KNIGHT],
-        "oneStep"
-      )
+      this.isAttackedBySlideNJump(sq, color, V.EMPRESS, V.steps[V.KNIGHT], 1)
     );
   }
 
   isAttackedByPrincess(sq, color) {
     return (
       this.isAttackedBySlideNJump(sq, color, V.PRINCESS, V.steps[V.BISHOP]) ||
-      this.isAttackedBySlideNJump(
-        sq,
-        color,
-        V.PRINCESS,
-        V.steps[V.KNIGHT],
-        "oneStep"
-      )
+      this.isAttackedBySlideNJump(sq, color, V.PRINCESS, V.steps[V.KNIGHT], 1)
     );
   }
 
@@ -134,11 +116,11 @@ export class PerfectRules extends ChessRules {
     return 2;
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
+  static GenRandInitFen(options) {
+    if (options.randomness == 0)
       return "esqakbnr/pppppppp/8/8/8/8/PPPPPPPP/ESQAKBNR w 0 ahah -";
 
-    const baseFen = ChessRules.GenRandInitFen(randomness);
+    const baseFen = ChessRules.GenRandInitFen(options);
     const fenParts = baseFen.split(' ');
     const posParts = fenParts[0].split('/');
 
diff --git a/client/src/variants/Pocketknight.js b/client/src/variants/Pocketknight.js
index 41dbb725..ad17f937 100644
--- a/client/src/variants/Pocketknight.js
+++ b/client/src/variants/Pocketknight.js
@@ -33,10 +33,9 @@ export class PocketknightRules extends ChessRules {
     this.subTurn = 1;
   }
 
-  static GenRandInitFen(randomness) {
+  static GenRandInitFen(options) {
     // Add 2 knight flags
-    return ChessRules.GenRandInitFen(randomness)
-      .slice(0, -2) + "11 -";
+    return ChessRules.GenRandInitFen(options).slice(0, -2) + "11 -";
   }
 
   getFlagsFen() {
diff --git a/client/src/variants/Queenpawns.js b/client/src/variants/Queenpawns.js
index 0ea2e45f..1b02dcfc 100644
--- a/client/src/variants/Queenpawns.js
+++ b/client/src/variants/Queenpawns.js
@@ -2,6 +2,10 @@ import { ChessRules } from "@/base_rules";
 
 export class QueenpawnsRules extends ChessRules {
 
+  static get Options() {
+    return null;
+  }
+
   static get PawnSpecs() {
     return Object.assign(
       {},
diff --git a/client/src/variants/Racingkings.js b/client/src/variants/Racingkings.js
index e898a554..745843b9 100644
--- a/client/src/variants/Racingkings.js
+++ b/client/src/variants/Racingkings.js
@@ -2,6 +2,10 @@ import { ChessRules } from "@/base_rules";
 
 export class RacingkingsRules extends ChessRules {
 
+  static get Options() {
+    return null;
+  }
+
   static get HasFlags() {
     return false;
   }
diff --git a/client/src/variants/Recycle.js b/client/src/variants/Recycle.js
index 4afae21c..de0ff501 100644
--- a/client/src/variants/Recycle.js
+++ b/client/src/variants/Recycle.js
@@ -28,8 +28,8 @@ export class RecycleRules extends ChessRules {
     );
   }
 
-  static GenRandInitFen(randomness) {
-    return ChessRules.GenRandInitFen(randomness) + " 0000000000";
+  static GenRandInitFen(options) {
+    return ChessRules.GenRandInitFen(options) + " 0000000000";
   }
 
   getFen() {
diff --git a/client/src/variants/Refusal1.js b/client/src/variants/Refusal1.js
index 4f50d754..319d4ad2 100644
--- a/client/src/variants/Refusal1.js
+++ b/client/src/variants/Refusal1.js
@@ -29,8 +29,8 @@ export class Refusal1Rules extends ChessRules {
   // NOTE: with this variant's special rule,
   // some extra repetitions could be detected... TODO (...)
 
-  static GenRandInitFen(randomness) {
-    return ChessRules.GenRandInitFen(randomness).slice(0, -6)  + "- null";
+  static GenRandInitFen(options) {
+    return ChessRules.GenRandInitFen(options).slice(0, -6)  + "- null";
   }
 
   setOtherVariables(fen) {
diff --git a/client/src/variants/Relayup.js b/client/src/variants/Relayup.js
index 446c9273..029eeb55 100644
--- a/client/src/variants/Relayup.js
+++ b/client/src/variants/Relayup.js
@@ -46,7 +46,7 @@ export class RelayupRules extends ChessRules {
       else steps = V.steps[V.ROOK].concat(V.steps[V.BISHOP]);
       const extraMoves =
         super.getSlideNJumpMoves(
-          sq, steps, oneStep || [V.KNIGHT, V.KING].includes(pg))
+          sq, steps, (oneStep || [V.KNIGHT, V.KING].includes(pg) ? 1 : null))
         .filter(m => {
           return (
             (piece != V.PAWN || m.end.x != lastRank) &&
diff --git a/client/src/variants/Rococo.js b/client/src/variants/Rococo.js
index 6af29c05..3101a7c3 100644
--- a/client/src/variants/Rococo.js
+++ b/client/src/variants/Rococo.js
@@ -205,23 +205,11 @@ export class RococoRules extends ChessRules {
     // NOTE: not removing "dist" field; shouldn't matter much...
   }
 
-  getSlideNJumpMoves([x, y], steps, oneStep) {
-    const piece = this.getPiece(x, y);
-    let moves = [];
-    outerLoop: for (let step of steps) {
-      let i = x + step[0];
-      let j = y + step[1];
-      while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
-        moves.push(this.getBasicMove([x, y], [i, j]));
-        if (oneStep !== undefined) continue outerLoop;
-        i += step[0];
-        j += step[1];
-      }
-      // Only king can take on occupied square:
-      if (piece == V.KING && V.OnBoard(i, j) && this.canTake([x, y], [i, j]))
-        moves.push(this.getBasicMove([x, y], [i, j]));
-    }
-    return moves;
+  canTake([x1, y1], [x2, y2]) {
+    return (
+      this.getPiece(x1, y1) == V.KING &&
+      this.getColor(x1, y1) != this.getColor(x2, y2)
+    );
   }
 
   // "Cannon/grasshopper pawn"
@@ -632,8 +620,8 @@ export class RococoRules extends ChessRules {
     return false;
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0) {
+  static GenRandInitFen(options) {
+    if (options.randomness == 0) {
       return (
         "91/1rqnbknqm1/1pppppppp1/91/91/91/91/1PPPPPPPP1/1MQNBKNQR1/91 w 0 -"
       );
@@ -642,7 +630,7 @@ export class RococoRules extends ChessRules {
     let pieces = { w: new Array(8), b: new Array(8) };
     // Shuffle pieces on first and last rank
     for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
+      if (c == 'b' && options.randomness == 1) {
         pieces['b'] = pieces['w'];
         break;
       }
diff --git a/client/src/variants/Rollerball.js b/client/src/variants/Rollerball.js
index 36373b29..c39339ef 100644
--- a/client/src/variants/Rollerball.js
+++ b/client/src/variants/Rollerball.js
@@ -2,6 +2,10 @@ import { ChessRules } from "@/base_rules";
 
 export class RollerballRules extends ChessRules {
 
+  static get Options() {
+    return null;
+  }
+
   static get HasEnpassant() {
     return false;
   }
@@ -121,14 +125,14 @@ export class RollerballRules extends ChessRules {
       const forward = (y <= 1 ? -1 : 1);
       return (
         super.getSlideNJumpMoves(
-          [x, y], [[forward, -1], [forward, 0], [forward, 1]], "oneStep")
+          [x, y], [[forward, -1], [forward, 0], [forward, 1]], 1)
       );
     }
     if (inMiddleY) {
       const forward = (x <= 1 ? 1 : -1);
       let moves =
         super.getSlideNJumpMoves(
-          [x, y], [[-1, forward], [0, forward], [1, forward]], "oneStep");
+          [x, y], [[-1, forward], [0, forward], [1, forward]], 1);
       // Promotions may happen:
       let extraMoves = [];
       moves.forEach(m => {
@@ -154,13 +158,13 @@ export class RollerballRules extends ChessRules {
       const forward = (toRight ? 1 : -1);
       return (
         super.getSlideNJumpMoves(
-          [x, y], [[-1, forward], [0, forward], [1, forward]], "oneStep")
+          [x, y], [[-1, forward], [0, forward], [1, forward]], 1)
       );
     }
     const forward = (toUp ? -1 : 1);
     return (
       super.getSlideNJumpMoves(
-        [x, y], [[forward, -1], [forward, 0], [forward, 1]], "oneStep")
+        [x, y], [[forward, -1], [forward, 0], [forward, 1]], 1)
     );
   }
 
@@ -176,7 +180,7 @@ export class RollerballRules extends ChessRules {
     if (y >= 5) multiStep.push([1, 0]);
     else oneStep.push([1, 0]);
     const c = this.turn;
-    let moves = super.getSlideNJumpMoves([x, y], oneStep, "oneStep");
+    let moves = super.getSlideNJumpMoves([x, y], oneStep, 1);
     for (let step of multiStep) {
       let [i, j] = [x + step[0], y + step[1]];
       while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
@@ -248,7 +252,7 @@ export class RollerballRules extends ChessRules {
       if (!multiStep[str]) oneStep.push(V.DictBishopSteps[str]);
     });
     const c = this.turn;
-    let moves = super.getSlideNJumpMoves([x, y], oneStep, "oneStep");
+    let moves = super.getSlideNJumpMoves([x, y], oneStep, 1);
     for (let step of Object.values(multiStep)) {
       let [i, j] = [x + step[0], y + step[1]];
       while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
@@ -345,7 +349,7 @@ export class RollerballRules extends ChessRules {
           ? [ [forward, -1], [forward, 0], [forward, 1] ]
           : [ [-1, forward], [0, forward], [1, forward] ];
       return (
-        super.isAttackedBySlideNJump([x, y], color, V.PAWN, steps, "oneStep")
+        super.isAttackedBySlideNJump([x, y], color, V.PAWN, steps, 1)
       );
     }
     // In a corner: can be attacked by one square only
@@ -359,7 +363,7 @@ export class RollerballRules extends ChessRules {
       else step = [-1, 0];
     }
     return (
-      super.isAttackedBySlideNJump([x, y], color, V.PAWN, [step], "oneStep")
+      super.isAttackedBySlideNJump([x, y], color, V.PAWN, [step], 1)
     );
   }
 
@@ -376,7 +380,7 @@ export class RollerballRules extends ChessRules {
     if (y >= 5) multiStep.push([-1, 0]);
     else oneStep.push([-1, 0]);
     if (
-      super.isAttackedBySlideNJump([x, y], color, V.ROOK, oneStep, "oneStep")
+      super.isAttackedBySlideNJump([x, y], color, V.ROOK, oneStep, 1)
     ) {
       return true;
     }
@@ -444,7 +448,7 @@ export class RollerballRules extends ChessRules {
       if (!multiStep[str]) oneStep.push(V.DictBishopSteps[str]);
     });
     if (
-      super.isAttackedBySlideNJump([x, y], color, V.BISHOP, oneStep, "oneStep")
+      super.isAttackedBySlideNJump([x, y], color, V.BISHOP, oneStep, 1)
     ) {
       return true;
     }
diff --git a/client/src/variants/Rookpawns.js b/client/src/variants/Rookpawns.js
index 1daae907..3ffa6fc6 100644
--- a/client/src/variants/Rookpawns.js
+++ b/client/src/variants/Rookpawns.js
@@ -2,6 +2,10 @@ import { ChessRules } from "@/base_rules";
 
 export class RookpawnsRules extends ChessRules {
 
+  static get Options() {
+    return null;
+  }
+
   static get PawnSpecs() {
     return Object.assign(
       {},
diff --git a/client/src/variants/Royalrace.js b/client/src/variants/Royalrace.js
index 5d5992c8..3be0c149 100644
--- a/client/src/variants/Royalrace.js
+++ b/client/src/variants/Royalrace.js
@@ -24,14 +24,14 @@ export class RoyalraceRules extends ChessRules {
     return (b[1] == V.KNIGHT ? "Enpassant/" : "") + b;
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
+  static GenRandInitFen(options) {
+    if (options.randomness == 0)
       return "92/92/92/92/92/92/92/92/92/qrbnp1PNBRQ/krbnp1PNBRK w 0";
 
     let pieces = { w: new Array(10), b: new Array(10) };
     // Shuffle pieces on first and second rank
     for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
+      if (c == 'b' && options.randomness == 1) {
         pieces['b'] = JSON.parse(JSON.stringify(pieces['w'])).reverse();
         pieces['b'] =
           pieces['b'].splice(5,10).reverse().concat(
@@ -109,6 +109,7 @@ export class RoyalraceRules extends ChessRules {
     );
   }
 
+  // TODO: simplify this when base function is more general.
   getPotentialPawnMoves([x, y]) {
     // Normal moves (as a rook)
     let moves =
@@ -153,30 +154,13 @@ export class RoyalraceRules extends ChessRules {
 
   isAttackedByPawn([x, y], color) {
     // Pawns can capture forward and backward:
-    for (let pawnShift of [-1, 1]) {
-      if (0 < x + pawnShift && x + pawnShift < V.size.x) {
-        for (let i of [-1, 1]) {
-          if (
-            y + i >= 0 &&
-            y + i < V.size.y &&
-            this.getPiece(x + pawnShift, y + i) == V.PAWN &&
-            this.getColor(x + pawnShift, y + i) == color
-          ) {
-            return true;
-          }
-        }
-      }
-    }
-    return false;
+    return this.isAttackedBySlideNJump(
+      sq, color, V.PAWN, V.steps[V.BISHOP], 1);
   }
 
   isAttackedByKnight(sq, color) {
     return this.isAttackedBySlideNJump(
-      sq,
-      color,
-      V.KNIGHT,
-      V.steps[V.KNIGHT]
-    );
+      sq, color, V.KNIGHT, V.steps[V.KNIGHT]);
   }
 
   getCurrentScore() {
diff --git a/client/src/variants/Rugby.js b/client/src/variants/Rugby.js
index d802ca1a..64c99426 100644
--- a/client/src/variants/Rugby.js
+++ b/client/src/variants/Rugby.js
@@ -3,6 +3,10 @@ import { ArrayFun } from "@/utils/array";
 
 export class RugbyRules extends ChessRules {
 
+  static get Options() {
+    return null;
+  }
+
   static get HasFlags() {
     return false;
   }
@@ -29,7 +33,7 @@ export class RugbyRules extends ChessRules {
       this.turn == 'w'
         ? [ [-1,-1], [-1,1], [0,1], [0,-1], [1,-1], [1,0], [1,1] ]
         : [ [1,-1], [1,1], [0,1], [0,-1], [-1,-1], [-1,0], [-1,1] ];
-    let addMoves = this.getSlideNJumpMoves(sq, steps, "oneStep");
+    let addMoves = this.getSlideNJumpMoves(sq, steps, 1);
     return moves.concat(addMoves.filter(m => m.vanish.length == 1));
   }
 
diff --git a/client/src/variants/Schess.js b/client/src/variants/Schess.js
index d8e1b1c5..5f585719 100644
--- a/client/src/variants/Schess.js
+++ b/client/src/variants/Schess.js
@@ -78,9 +78,9 @@ export class SchessRules extends ChessRules {
     );
   }
 
-  static GenRandInitFen(randomness) {
+  static GenRandInitFen(options) {
     return (
-      ChessRules.GenRandInitFen(randomness).slice(0, -2) +
+      ChessRules.GenRandInitFen(options).slice(0, -2) +
       // Add pieceFlags + pocket
       "1111111111111111 - 1111"
     );
@@ -221,13 +221,13 @@ export class SchessRules extends ChessRules {
 
   getPotentialHawkMoves(sq) {
     return this.getSlideNJumpMoves(sq, V.steps[V.BISHOP]).concat(
-      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep")
+      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], 1)
     );
   }
 
   getPotentialElephantMoves(sq) {
     return this.getSlideNJumpMoves(sq, V.steps[V.ROOK]).concat(
-      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep")
+      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], 1)
     );
   }
 
@@ -242,26 +242,14 @@ export class SchessRules extends ChessRules {
   isAttackedByHawk(sq, color) {
     return (
       this.isAttackedBySlideNJump(sq, color, V.HAWK, V.steps[V.BISHOP]) ||
-      this.isAttackedBySlideNJump(
-        sq,
-        color,
-        V.HAWK,
-        V.steps[V.KNIGHT],
-        "oneStep"
-      )
+      this.isAttackedBySlideNJump(sq, color, V.HAWK, V.steps[V.KNIGHT], 1)
     );
   }
 
   isAttackedByElephant(sq, color) {
     return (
       this.isAttackedBySlideNJump(sq, color, V.ELEPHANT, V.steps[V.ROOK]) ||
-      this.isAttackedBySlideNJump(
-        sq,
-        color,
-        V.ELEPHANT,
-        V.steps[V.KNIGHT],
-        "oneStep"
-      )
+      this.isAttackedBySlideNJump(sq, color, V.ELEPHANT, V.steps[V.KNIGHT], 1)
     );
   }
 
@@ -330,9 +318,11 @@ export class SchessRules extends ChessRules {
 
   static get VALUES() {
     return Object.assign(
-      {},
-      ChessRules.VALUES,
-      { 'h': 5, 'e': 7 }
+      {
+        'h': 5,
+        'e': 7
+      },
+      ChessRules.VALUES
     );
   }
 
diff --git a/client/src/variants/Screen.js b/client/src/variants/Screen.js
index 8785560b..75da9600 100644
--- a/client/src/variants/Screen.js
+++ b/client/src/variants/Screen.js
@@ -4,6 +4,10 @@ import { ArrayFun } from "@/utils/array";
 
 export class ScreenRules extends ChessRules {
 
+  static get Options() {
+    return null;
+  }
+
   static get HasFlags() {
     return false;
   }
diff --git a/client/src/variants/Shako.js b/client/src/variants/Shako.js
index c3db2794..2701f1e2 100644
--- a/client/src/variants/Shako.js
+++ b/client/src/variants/Shako.js
@@ -68,7 +68,7 @@ export class ShakoRules extends ChessRules {
   }
 
   getPotentialElephantMoves([x, y]) {
-    return this.getSlideNJumpMoves([x, y], V.steps[V.ELEPHANT], "oneStep");
+    return this.getSlideNJumpMoves([x, y], V.steps[V.ELEPHANT], 1);
   }
 
   getPotentialCannonMoves([x, y]) {
@@ -115,7 +115,7 @@ export class ShakoRules extends ChessRules {
   isAttackedByElephant(sq, color) {
     return (
       this.isAttackedBySlideNJump(
-        sq, color, V.ELEPHANT, V.steps[V.ELEPHANT], "oneStep"
+        sq, color, V.ELEPHANT, V.steps[V.ELEPHANT], 1
       )
     );
   }
@@ -185,8 +185,8 @@ export class ShakoRules extends ChessRules {
     return 2;
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0) {
+  static GenRandInitFen(options) {
+    if (options.randomness == 0) {
       return (
         "c8c/ernbqkbnre/pppppppppp/91/91/91/91/PPPPPPPPPP/ERNBQKBNRE/C8C " +
         "w 0 bibi -"
@@ -197,7 +197,7 @@ export class ShakoRules extends ChessRules {
     let flags = "";
     // Shuffle pieces on second (and before-last rank if randomness == 2)
     for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
+      if (c == 'b' && options.randomness == 1) {
         pieces['b'] = pieces['w'];
         flags += flags;
         break;
diff --git a/client/src/variants/Shatranj.js b/client/src/variants/Shatranj.js
index 0569f713..568e2d96 100644
--- a/client/src/variants/Shatranj.js
+++ b/client/src/variants/Shatranj.js
@@ -43,57 +43,40 @@ export class ShatranjRules extends ChessRules {
     ];
   }
 
-  static GenRandInitFen(randomness) {
+  static GenRandInitFen(options) {
     // Remove castle flags and en-passant indication
-    return ChessRules.GenRandInitFen(randomness).slice(0, -7);
+    return ChessRules.GenRandInitFen(options).slice(0, -7);
   }
 
   getPotentialBishopMoves(sq) {
-    let moves = this.getSlideNJumpMoves(sq, V.ElephantSteps, "oneStep");
+    let moves = this.getSlideNJumpMoves(sq, V.ElephantSteps, 1);
     // Complete with "repositioning moves": like a queen, without capture
-    let repositioningMoves = this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.BISHOP],
-      "oneStep"
-    ).filter(m => m.vanish.length == 1);
+    let repositioningMoves =
+      this.getSlideNJumpMoves(sq, V.steps[V.BISHOP], 1)
+      .filter(m => m.vanish.length == 1);
     return moves.concat(repositioningMoves);
   }
 
   getPotentialQueenMoves(sq) {
     // Diagonal capturing moves
-    let captures = this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.BISHOP],
-      "oneStep"
-    ).filter(m => m.vanish.length == 2);
+    let captures =
+      this.getSlideNJumpMoves(sq, V.steps[V.BISHOP], 1)
+      .filter(m => m.vanish.length == 2);
     return captures.concat(
       // Orthogonal non-capturing moves
-      this.getSlideNJumpMoves(
-        sq,
-        V.steps[V.ROOK],
-        "oneStep"
-      ).filter(m => m.vanish.length == 1)
+      this.getSlideNJumpMoves(sq, V.steps[V.ROOK], 1)
+      .filter(m => m.vanish.length == 1)
     );
   }
 
   isAttackedByBishop(sq, color) {
     return this.isAttackedBySlideNJump(
-      sq,
-      color,
-      V.BISHOP,
-      V.ElephantSteps,
-      "oneStep"
-    );
+      sq, color, V.BISHOP, V.ElephantSteps, 1);
   }
 
   isAttackedByQueen(sq, color) {
     return this.isAttackedBySlideNJump(
-      sq,
-      color,
-      V.QUEEN,
-      V.steps[V.BISHOP],
-      "oneStep"
-    );
+      sq, color, V.QUEEN, V.steps[V.BISHOP], 1);
   }
 
   getCurrentScore() {
diff --git a/client/src/variants/Shinobi.js b/client/src/variants/Shinobi.js
index 995d2b91..e993188b 100644
--- a/client/src/variants/Shinobi.js
+++ b/client/src/variants/Shinobi.js
@@ -208,37 +208,34 @@ export class ShinobiRules extends ChessRules {
     if (this.getColor(x, y) == 'b') return super.getPotentialKingMoves([x, y]);
     // Clan doesn't castle:
     return super.getSlideNJumpMoves(
-      [x, y],
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-      "oneStep"
-    );
+      [x, y], V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
   }
 
   getPotentialCaptainMoves(sq) {
     const steps = V.steps[V.ROOK].concat(V.steps[V.BISHOP]);
-    return super.getSlideNJumpMoves(sq, steps, "oneStep");
+    return super.getSlideNJumpMoves(sq, steps, 1);
   }
 
   getPotentialNinjaMoves(sq) {
     return (
       super.getSlideNJumpMoves(sq, V.steps[V.BISHOP])
-      .concat(super.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep"))
+      .concat(super.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], 1))
     );
   }
 
   getPotentialDragonMoves(sq) {
     return (
       super.getSlideNJumpMoves(sq, V.steps[V.ROOK])
-      .concat(super.getSlideNJumpMoves(sq, V.steps[V.BISHOP], "oneStep"))
+      .concat(super.getSlideNJumpMoves(sq, V.steps[V.BISHOP], 1))
     );
   }
 
   getPotentialMonkMoves(sq) {
-    return super.getSlideNJumpMoves(sq, V.steps[V.BISHOP], "oneStep");
+    return super.getSlideNJumpMoves(sq, V.steps[V.BISHOP], 1);
   }
 
   getPotentialHorseMoves(sq) {
-    return super.getSlideNJumpMoves(sq, [ [-2, 1], [-2, -1] ], "oneStep");
+    return super.getSlideNJumpMoves(sq, [ [-2, 1], [-2, -1] ], 1);
   }
 
   getPotentialLanceMoves(sq) {
@@ -267,7 +264,7 @@ export class ShinobiRules extends ChessRules {
   isAttackedByCaptain(sq, color) {
     const steps = V.steps[V.BISHOP].concat(V.steps[V.ROOK]);
     return (
-      super.isAttackedBySlideNJump(sq, color, V.CAPTAIN, steps, "oneStep")
+      super.isAttackedBySlideNJump(sq, color, V.CAPTAIN, steps, 1)
     );
   }
 
@@ -275,7 +272,7 @@ export class ShinobiRules extends ChessRules {
     return (
       super.isAttackedBySlideNJump(sq, color, V.NINJA, V.steps[V.BISHOP]) ||
       super.isAttackedBySlideNJump(
-        sq, color, V.NINJA, V.steps[V.KNIGHT], "oneStep")
+        sq, color, V.NINJA, V.steps[V.KNIGHT], 1)
     );
   }
 
@@ -283,21 +280,21 @@ export class ShinobiRules extends ChessRules {
     return (
       super.isAttackedBySlideNJump(sq, color, V.DRAGON, V.steps[V.ROOK]) ||
       super.isAttackedBySlideNJump(
-        sq, color, V.DRAGON, V.steps[V.BISHOP], "oneStep")
+        sq, color, V.DRAGON, V.steps[V.BISHOP], 1)
     );
   }
 
   isAttackedByMonk(sq, color) {
     return (
       super.isAttackedBySlideNJump(
-        sq, color, V.MONK, V.steps[V.BISHOP], "oneStep")
+        sq, color, V.MONK, V.steps[V.BISHOP], 1)
     );
   }
 
   isAttackedByHorse(sq, color) {
     return (
       super.isAttackedBySlideNJump(
-        sq, color, V.HORSE, [ [2, 1], [2, -1] ], "oneStep")
+        sq, color, V.HORSE, [ [2, 1], [2, -1] ], 1)
     );
   }
 
diff --git a/client/src/variants/Shogi.js b/client/src/variants/Shogi.js
index bca37627..1526aabd 100644
--- a/client/src/variants/Shogi.js
+++ b/client/src/variants/Shogi.js
@@ -113,8 +113,8 @@ export class ShogiRules extends ChessRules {
     );
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0) {
+  static GenRandInitFen(options) {
+    if (options.randomness == 0) {
       return (
         "lnsgkgsnl/1r5b1/ppppppppp/9/9/9/PPPPPPPPP/1B5R1/LNSGKGSNL " +
         "w 0 00000000000000"
@@ -125,7 +125,7 @@ export class ShogiRules extends ChessRules {
     let pieces1 = { w: new Array(4), b: new Array(4) };
     let positions2 = { w: new Array(2), b: new Array(2) };
     for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
+      if (c == 'b' && options.randomness == 1) {
         pieces1['b'] = JSON.parse(JSON.stringify(pieces1['w'])).reverse();
         positions2['b'] =
           JSON.parse(JSON.stringify(positions2['w'])).reverse()
@@ -426,7 +426,7 @@ export class ShogiRules extends ChessRules {
     const forward = (this.turn == 'w' ? -1 : 1);
     return this.getSlideNJumpMoves(
       sq,
-      [[forward, 0]],
+      [ [forward, 0] ],
       {
         promote: V.P_LANCE,
         force: true
@@ -492,35 +492,19 @@ export class ShogiRules extends ChessRules {
 
   isAttackedBySilver([x, y], color) {
     const shift = (color == 'w' ? 1 : -1);
-    for (let step of V.steps[V.BISHOP].concat([[shift, 0]])) {
-      const [i, j] = [x + step[0], y + step[1]];
-      if (
-        V.OnBoard(i, j) &&
-        this.board[i][j] != V.EMPTY &&
-        this.getColor(i, j) == color &&
-        this.getPiece(i, j) == V.SILVER_G
-      ) {
-        return true;
-      }
-    }
-    return false;
+    return this.isAttackedBySlideNJump(
+      sq, color, V.SILVER, V.steps[V.BISHOP].concat([ [shift, 0] ]), 1);
   }
 
   isAttackedByPawn([x, y], color) {
     const shift = (color == 'w' ? 1 : -1);
-    const [i, j] = [x + shift, y];
-    return (
-      V.OnBoard(i, j) &&
-      this.board[i][j] != V.EMPTY &&
-      this.getColor(i, j) == color &&
-      this.getPiece(i, j) == V.PAWN
-    );
+    return this.isAttackedBySlideNJump(sq, color, V.PAWN, [ [shift, 0] ], 1);
   }
 
   isAttackedByKnight(sq, color) {
     const forward = (color == 'w' ? 2 : -2);
     return this.isAttackedBySlideNJump(
-      sq, color, V.KNIGHT, [[forward, 1], [forward, -1]], "oneStep");
+      sq, color, V.KNIGHT, [ [forward, 1], [forward, -1] ], 1);
   }
 
   isAttackedByLance(sq, color) {
@@ -531,16 +515,14 @@ export class ShogiRules extends ChessRules {
   isAttackedByDragon(sq, color) {
     return (
       this.isAttackedBySlideNJump(sq, color, V.P_ROOK, V.steps[V.ROOK]) ||
-      this.isAttackedBySlideNJump(
-        sq, color, V.P_ROOK, V.steps[V.BISHOP], "oneStep")
+      this.isAttackedBySlideNJump(sq, color, V.P_ROOK, V.steps[V.BISHOP], 1)
     );
   }
 
   isAttackedByHorse(sq, color) {
     return (
       this.isAttackedBySlideNJump(sq, color, V.P_BISHOP, V.steps[V.BISHOP]) ||
-      this.isAttackedBySlideNJump(
-        sq, color, V.P_BISHOP, V.steps[V.ROOK], "oneStep")
+      this.isAttackedBySlideNJump(sq, color, V.P_BISHOP, V.steps[V.ROOK], 1)
     );
   }
 
diff --git a/client/src/variants/Shogun.js b/client/src/variants/Shogun.js
index 1a20d329..c45dff23 100644
--- a/client/src/variants/Shogun.js
+++ b/client/src/variants/Shogun.js
@@ -51,8 +51,8 @@ export class ShogunRules extends ChessRules {
     );
   }
 
-  static GenRandInitFen(randomness) {
-    return ChessRules.GenRandInitFen(randomness) + " 0000000000";
+  static GenRandInitFen(options) {
+    return ChessRules.GenRandInitFen(options) + " 0000000000";
   }
 
   getFen() {
@@ -257,31 +257,31 @@ export class ShogunRules extends ChessRules {
   }
 
   getPotentialDuchessMoves(sq) {
-    return super.getSlideNJumpMoves(sq, V.steps[V.BISHOP], "oneStep");
+    return super.getSlideNJumpMoves(sq, V.steps[V.BISHOP], 1);
   }
 
   getPotentialCaptainMoves(sq) {
     const steps = V.steps[V.ROOK].concat(V.steps[V.BISHOP]);
-    return super.getSlideNJumpMoves(sq, steps, "oneStep");
+    return super.getSlideNJumpMoves(sq, steps, 1);
   }
 
   getPotentialMortarMoves(sq) {
     return (
       super.getSlideNJumpMoves(sq, V.steps[V.ROOK])
-      .concat(super.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep"))
+      .concat(super.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], 1))
     );
   }
 
   getPotentialGeneralMoves(sq) {
     const steps =
       V.steps[V.BISHOP].concat(V.steps[V.ROOK]).concat(V.steps[V.KNIGHT]);
-    return super.getSlideNJumpMoves(sq, steps, "oneStep");
+    return super.getSlideNJumpMoves(sq, steps, 1);
   }
 
   getPotentialArchbishopMoves(sq) {
     return (
       super.getSlideNJumpMoves(sq, V.steps[V.BISHOP])
-      .concat(super.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep"))
+      .concat(super.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], 1))
     );
   }
 
@@ -299,14 +299,14 @@ export class ShogunRules extends ChessRules {
   isAttackedByDuchess(sq, color) {
     return (
       super.isAttackedBySlideNJump(
-        sq, color, V.DUCHESS, V.steps[V.BISHOP], "oneStep")
+        sq, color, V.DUCHESS, V.steps[V.BISHOP], 1)
     );
   }
 
   isAttackedByCaptain(sq, color) {
     const steps = V.steps[V.BISHOP].concat(V.steps[V.ROOK]);
     return (
-      super.isAttackedBySlideNJump(sq, color, V.DUCHESS, steps, "oneStep")
+      super.isAttackedBySlideNJump(sq, color, V.DUCHESS, steps, 1)
     );
   }
 
@@ -314,7 +314,7 @@ export class ShogunRules extends ChessRules {
     return (
       super.isAttackedBySlideNJump(sq, color, V.MORTAR, V.steps[V.ROOK]) ||
       super.isAttackedBySlideNJump(
-        sq, color, V.MORTAR, V.steps[V.KNIGHT], "oneStep")
+        sq, color, V.MORTAR, V.steps[V.KNIGHT], 1)
     );
   }
 
@@ -322,7 +322,7 @@ export class ShogunRules extends ChessRules {
     const steps =
       V.steps[V.BISHOP].concat(V.steps[V.ROOK]).concat(V.steps[V.KNIGHT]);
     return (
-      super.isAttackedBySlideNJump(sq, color, V.GENERAL, steps, "oneStep")
+      super.isAttackedBySlideNJump(sq, color, V.GENERAL, steps, 1)
     );
   }
 
@@ -331,7 +331,7 @@ export class ShogunRules extends ChessRules {
       super.isAttackedBySlideNJump(sq, color, V.ARCHBISHOP, V.steps[V.BISHOP])
       ||
       super.isAttackedBySlideNJump(
-        sq, color, V.ARCHBISHOP, V.steps[V.KNIGHT], "oneStep")
+        sq, color, V.ARCHBISHOP, V.steps[V.KNIGHT], 1)
     );
   }
 
diff --git a/client/src/variants/Sittuyin.js b/client/src/variants/Sittuyin.js
index 5efd8cda..a18c2f0b 100644
--- a/client/src/variants/Sittuyin.js
+++ b/client/src/variants/Sittuyin.js
@@ -3,6 +3,10 @@ import { randInt } from "@/utils/alea";
 
 export class SittuyinRules extends ChessRules {
 
+  static get Options() {
+    return null;
+  }
+
   static get HasFlags() {
     return false;
   }
@@ -260,18 +264,11 @@ export class SittuyinRules extends ChessRules {
   getPotentialBishopMoves(sq) {
     const forward = (this.turn == 'w' ? -1 : 1);
     return this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.BISHOP].concat([ [forward, 0] ]),
-      "oneStep"
-    );
+      sq, V.steps[V.BISHOP].concat([ [forward, 0] ]), 1);
   }
 
   getPotentialQueenMoves(sq) {
-    return this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.BISHOP],
-      "oneStep"
-    );
+    return this.getSlideNJumpMoves(sq, V.steps[V.BISHOP], 1);
   }
 
   getAllValidMoves() {
@@ -289,22 +286,12 @@ export class SittuyinRules extends ChessRules {
   isAttackedByBishop(sq, color) {
     const forward = (this.turn == 'w' ? 1 : -1);
     return this.isAttackedBySlideNJump(
-      sq,
-      color,
-      V.BISHOP,
-      V.steps[V.BISHOP].concat([ [forward, 0] ]),
-      "oneStep"
-    );
+      sq, color, V.BISHOP, V.steps[V.BISHOP].concat([ [forward, 0] ]), 1);
   }
 
   isAttackedByQueen(sq, color) {
     return this.isAttackedBySlideNJump(
-      sq,
-      color,
-      V.QUEEN,
-      V.steps[V.BISHOP],
-      "oneStep"
-    );
+      sq, color, V.QUEEN, V.steps[V.BISHOP], 1);
   }
 
   underCheck(color) {
diff --git a/client/src/variants/Spartan.js b/client/src/variants/Spartan.js
index 2400e040..20919eaf 100644
--- a/client/src/variants/Spartan.js
+++ b/client/src/variants/Spartan.js
@@ -16,8 +16,8 @@ export class SpartanRules extends ChessRules {
     return b;
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
+  static GenRandInitFen(options) {
+    if (options.randomness == 0)
       return "lgkcckwl/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w 0 ah";
 
     // Mapping white --> black (first knight --> general; TODO):
@@ -30,7 +30,7 @@ export class SpartanRules extends ChessRules {
       'g': 'g'
     };
 
-    const baseFen = ChessRules.GenRandInitFen(randomness).replace('n', 'g');
+    const baseFen = ChessRules.GenRandInitFen(options).replace('n', 'g');
     return (
       baseFen.substr(0, 8).split('').map(p => piecesMap[p]).join('') +
       baseFen.substr(8)
@@ -154,7 +154,7 @@ export class SpartanRules extends ChessRules {
   getPotentialSpartanKingMoves(sq) {
     // No castle:
     const steps = V.steps[V.ROOK].concat(V.steps[V.BISHOP]);
-    return super.getSlideNJumpMoves(sq, steps, "oneStep");
+    return super.getSlideNJumpMoves(sq, steps, 1);
   }
 
   getPotentialHopliteMoves([x, y]) {
@@ -212,26 +212,26 @@ export class SpartanRules extends ChessRules {
     const steps = V.steps[V.BISHOP].concat(V.steps['a']);
     Array.prototype.push.apply(
       moves,
-      super.getSlideNJumpMoves([x, y], steps, "oneStep")
+      super.getSlideNJumpMoves([x, y], steps, 1)
     );
     return moves;
   }
 
   getPotentialCaptainMoves([x, y]) {
     const steps = V.steps[V.ROOK].concat(V.steps['d']);
-    return super.getSlideNJumpMoves([x, y], steps, "oneStep")
+    return super.getSlideNJumpMoves([x, y], steps, 1)
   }
 
   getPotentialGeneralMoves([x, y]) {
     return (
-      super.getSlideNJumpMoves([x, y], V.steps[V.BISHOP], "oneStep")
+      super.getSlideNJumpMoves([x, y], V.steps[V.BISHOP], 1)
       .concat(super.getSlideNJumpMoves([x, y], V.steps[V.ROOK]))
     );
   }
 
   getPotentialWarlordMoves([x, y]) {
     return (
-      super.getSlideNJumpMoves([x, y], V.steps[V.KNIGHT], "oneStep")
+      super.getSlideNJumpMoves([x, y], V.steps[V.KNIGHT], 1)
       .concat(super.getSlideNJumpMoves([x, y], V.steps[V.BISHOP]))
     );
   }
@@ -249,25 +249,25 @@ export class SpartanRules extends ChessRules {
   }
 
   isAttackedByHoplite(sq) {
-    return super.isAttackedBySlideNJump(sq, 'b', V.PAWN, [[-1,0]], "oneStep");
+    return super.isAttackedBySlideNJump(sq, 'b', V.PAWN, [[-1,0]], 1);
   }
 
   isAttackedByLieutenant(sq) {
     const steps = V.steps[V.BISHOP].concat(V.steps['a']);
     return (
-      super.isAttackedBySlideNJump(sq, 'b', V.LIEUTENANT, steps, "oneStep")
+      super.isAttackedBySlideNJump(sq, 'b', V.LIEUTENANT, steps, 1)
     );
   }
 
   isAttackedByCaptain(sq) {
     const steps = V.steps[V.ROOK].concat(V.steps['d']);
-    return super.isAttackedBySlideNJump(sq, 'b', V.CAPTAIN, steps, "oneStep");
+    return super.isAttackedBySlideNJump(sq, 'b', V.CAPTAIN, steps, 1);
   }
 
   isAttackedByGeneral(sq) {
     return (
       super.isAttackedBySlideNJump(
-        sq, 'b', V.GENERAL, V.steps[V.BISHOP], "oneStep") ||
+        sq, 'b', V.GENERAL, V.steps[V.BISHOP], 1) ||
       super.isAttackedBySlideNJump(sq, 'b', V.GENERAL, V.steps[V.ROOK])
     );
   }
@@ -275,7 +275,7 @@ export class SpartanRules extends ChessRules {
   isAttackedByWarlord(sq) {
     return (
       super.isAttackedBySlideNJump(
-        sq, 'b', V.WARLORD, V.steps[V.KNIGHT], "oneStep") ||
+        sq, 'b', V.WARLORD, V.steps[V.KNIGHT], 1) ||
       super.isAttackedBySlideNJump(sq, 'b', V.WARLORD, V.steps[V.BISHOP])
     );
   }
diff --git a/client/src/variants/Squatter2.js b/client/src/variants/Squatter2.js
index 15caaf5b..54c54c4e 100644
--- a/client/src/variants/Squatter2.js
+++ b/client/src/variants/Squatter2.js
@@ -81,8 +81,8 @@ export class Squatter2Rules extends ChessRules {
     return "1/2";
   }
 
-  static GenRandInitFen(randomness) {
-    return SuicideRules.GenRandInitFen(randomness);
+  static GenRandInitFen(options) {
+    return SuicideRules.GenRandInitFen(options);
   }
 
 };
diff --git a/client/src/variants/Stealthbomb1.js b/client/src/variants/Stealthbomb1.js
index dce7f5a9..a82d1700 100644
--- a/client/src/variants/Stealthbomb1.js
+++ b/client/src/variants/Stealthbomb1.js
@@ -16,8 +16,7 @@ export class Stealthbomb1Rules extends ChessRules {
       t: "q",
       u: "r",
       c: "b",
-      o: "n",
-      l: "k"
+      o: "n"
     };
   }
   static get BOMB_CODE() {
@@ -26,8 +25,7 @@ export class Stealthbomb1Rules extends ChessRules {
       q: "t",
       r: "u",
       b: "c",
-      n: "o",
-      k: "l"
+      n: "o"
     };
   }
 
@@ -77,7 +75,7 @@ export class Stealthbomb1Rules extends ChessRules {
     );
   }
 
-  // Initiate the game by choosing a square for the bomb:
+  // Initiate the game by choosing a piece holding the bomb:
   doClick(square) {
     const c = this.turn;
     if (
@@ -91,6 +89,7 @@ export class Stealthbomb1Rules extends ChessRules {
     }
     const [x, y] = square;
     const piece = super.getPiece(x, y);
+    if (piece == V.KING) return null; //no bomb on king!
     return new Move({
       appear: [ new PiPo({ x: x, y: y, c: c, p: V.BOMB_CODE[piece] }) ],
       vanish: [ new PiPo({ x: x, y: y, c: c, p: piece }) ],
diff --git a/client/src/variants/Stealthbomb2.js b/client/src/variants/Stealthbomb2.js
index 613a5c28..648ee299 100644
--- a/client/src/variants/Stealthbomb2.js
+++ b/client/src/variants/Stealthbomb2.js
@@ -3,7 +3,7 @@ import { Stealthbomb1Rules } from "@/variants/Stealthbomb1";
 
 export class Stealthbomb2Rules extends Stealthbomb1Rules {
 
-  // Initiate the game by choosing a square for the bomb:
+  // Initiate the game by choosing a pawn holding the bomb:
   doClick(square) {
     const c = this.turn;
     if (
diff --git a/client/src/variants/Suction.js b/client/src/variants/Suction.js
index 2bf3ecf7..77aef39a 100644
--- a/client/src/variants/Suction.js
+++ b/client/src/variants/Suction.js
@@ -149,9 +149,9 @@ export class SuctionRules extends ChessRules {
     });
   }
 
-  static GenRandInitFen(randomness) {
+  static GenRandInitFen(options) {
     // Add empty cmove:
-    return SuicideRules.GenRandInitFen(randomness) + " -";
+    return SuicideRules.GenRandInitFen(options) + " -";
   }
 
   getCmoveFen() {
diff --git a/client/src/variants/Suicide.js b/client/src/variants/Suicide.js
index 13aaa6bb..3b3c03cd 100644
--- a/client/src/variants/Suicide.js
+++ b/client/src/variants/Suicide.js
@@ -135,13 +135,13 @@ export class SuicideRules extends ChessRules {
     return -super.evalPosition();
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
+  static GenRandInitFen(options) {
+    if (options.randomness == 0)
       return "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w 0 -";
 
     let pieces = { w: new Array(8), b: new Array(8) };
     for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
+      if (c == 'b' && options.randomness == 1) {
         pieces['b'] = pieces['w'];
         break;
       }
diff --git a/client/src/variants/Swap.js b/client/src/variants/Swap.js
index 167adeae..3f4cde40 100644
--- a/client/src/variants/Swap.js
+++ b/client/src/variants/Swap.js
@@ -146,9 +146,9 @@ export class SwapRules extends ChessRules {
     });
   }
 
-  static GenRandInitFen(randomness) {
+  static GenRandInitFen(options) {
     // Add empty smove:
-    return ChessRules.GenRandInitFen(randomness) + " -";
+    return ChessRules.GenRandInitFen(options) + " -";
   }
 
   getSmoveFen() {
diff --git a/client/src/variants/Synchrone1.js b/client/src/variants/Synchrone1.js
index 7410d278..2aa5b45f 100644
--- a/client/src/variants/Synchrone1.js
+++ b/client/src/variants/Synchrone1.js
@@ -53,8 +53,8 @@ export class Synchrone1Rules extends ChessRules {
     );
   }
 
-  static GenRandInitFen(randomness) {
-    return ChessRules.GenRandInitFen(randomness).slice(0, -1) + "-,- -";
+  static GenRandInitFen(options) {
+    return ChessRules.GenRandInitFen(options).slice(0, -1) + "-,- -";
   }
 
   getFen() {
diff --git a/client/src/variants/Synchrone2.js b/client/src/variants/Synchrone2.js
index dc038ecb..17b0be32 100644
--- a/client/src/variants/Synchrone2.js
+++ b/client/src/variants/Synchrone2.js
@@ -47,8 +47,8 @@ export class Synchrone2Rules extends Synchrone1Rules {
     );
   }
 
-  static GenRandInitFen(randomness) {
-    const res = ChessRules.GenRandInitFen(randomness);
+  static GenRandInitFen(options) {
+    const res = ChessRules.GenRandInitFen(options);
     // Add initFen field:
     return res.slice(0, -1) + res.split(' ')[0] + " -";
   }
diff --git a/client/src/variants/Synochess.js b/client/src/variants/Synochess.js
index f5ee12ad..74eecace 100644
--- a/client/src/variants/Synochess.js
+++ b/client/src/variants/Synochess.js
@@ -2,6 +2,18 @@ import { ChessRules, Move, PiPo } from "@/base_rules";
 
 export class SynochessRules extends ChessRules {
 
+  static get Options() {
+    return {
+      check: [
+        {
+          label: "Random",
+          defaut: false,
+          variable: "random"
+        }
+      ]
+    };
+  }
+
   static get LoseOnRepetition() {
     return true;
   }
@@ -28,8 +40,8 @@ export class SynochessRules extends ChessRules {
     );
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
+  static GenRandInitFen(options) {
+    if (!options.random)
       return "rneakenr/8/1c4c1/1ss2ss1/8/8/PPPPPPPP/RNBQKBNR w 0 ah - 2";
 
     // Mapping kingdom --> dynasty:
@@ -42,7 +54,7 @@ export class SynochessRules extends ChessRules {
     };
 
     // Always symmetric (randomness = 1), because open files.
-    const baseFen = ChessRules.GenRandInitFen(1);
+    const baseFen = ChessRules.GenRandInitFen({ randomness: 1 });
     return (
       baseFen.substr(0, 8).split("").map(p => piecesMap[p]).join("") +
       "/8/1c4c1/1ss2ss1/" + baseFen.substr(22, 28) + " - 2"
@@ -305,17 +317,14 @@ export class SynochessRules extends ChessRules {
 
   getPotentialAdvisorMoves(sq) {
     return super.getSlideNJumpMoves(
-      sq, V.steps[V.ROOK].concat(V.steps[V.BISHOP]), "oneStep");
+      sq, V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
   }
 
   getPotentialKingMoves([x, y]) {
     if (this.getColor(x, y) == 'w') return super.getPotentialKingMoves([x, y]);
     // Dynasty doesn't castle:
     return super.getSlideNJumpMoves(
-      [x, y],
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-      "oneStep"
-    );
+      [x, y], V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
   }
 
   getPotentialSoldierMoves([x, y]) {
@@ -326,11 +335,11 @@ export class SynochessRules extends ChessRules {
     if (!lastRank) steps.push([shiftX, 0]);
     if (y > 0) steps.push([0, -1]);
     if (y < 9) steps.push([0, 1]);
-    return super.getSlideNJumpMoves([x, y], steps, "oneStep");
+    return super.getSlideNJumpMoves([x, y], steps, 1);
   }
 
   getPotentialElephantMoves([x, y]) {
-    return this.getSlideNJumpMoves([x, y], V.steps[V.ELEPHANT], "oneStep");
+    return this.getSlideNJumpMoves([x, y], V.steps[V.ELEPHANT], 1);
   }
 
   // NOTE: (mostly) duplicated from Shako (TODO?)
@@ -417,26 +426,19 @@ export class SynochessRules extends ChessRules {
   }
 
   isAttackedByAdvisor(sq, color) {
-    return (
-      super.isAttackedBySlideNJump(
-        sq, color, V.ADVISOR,
-        V.steps[V.ROOK].concat(V.steps[V.BISHOP]), "oneStep"
-      )
-    );
+    return super.isAttackedBySlideNJump(
+      sq, color, V.ADVISOR, V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1);
   }
 
   isAttackedByElephant(sq, color) {
-    return (
-      this.isAttackedBySlideNJump(
-        sq, color, V.ELEPHANT, V.steps[V.ELEPHANT], "oneStep"
-      )
-    );
+    return this.isAttackedBySlideNJump(
+      sq, color, V.ELEPHANT, V.steps[V.ELEPHANT], 1);
   }
 
   isAttackedBySoldier([x, y], color) {
     const shiftX = (color == 'w' ? 1 : -1); //shift from king
     return super.isAttackedBySlideNJump(
-      [x, y], color, V.SOLDIER, [[shiftX, 0], [0, 1], [0, -1]], "oneStep");
+      [x, y], color, V.SOLDIER, [[shiftX, 0], [0, 1], [0, -1]], 1);
   }
 
   getAllValidMoves() {
diff --git a/client/src/variants/Tencubed.js b/client/src/variants/Tencubed.js
index af48977e..11270b21 100644
--- a/client/src/variants/Tencubed.js
+++ b/client/src/variants/Tencubed.js
@@ -60,8 +60,6 @@ export class TencubedRules extends ChessRules {
 
   static get steps() {
     return Object.assign(
-      {},
-      ChessRules.steps,
       {
         w: [
           [-3, -1],
@@ -91,12 +89,13 @@ export class TencubedRules extends ChessRules {
           [2, 0],
           [0, 2]
         ]
-      }
+      },
+      ChessRules.steps,
     );
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0) {
+  static GenRandInitFen(options) {
+    if (options.randomness == 0) {
       return (
         "2cwamwc2/1rnbqkbnr1/pppppppppp/91/91/" +
         "91/91/PPPPPPPPPP/1RNBQKBNR1/2CWAMWC2/ " +
@@ -104,7 +103,7 @@ export class TencubedRules extends ChessRules {
       );
     }
 
-    const baseFen = V.ParseFen(ChessRules.GenRandInitFen(randomness));
+    const baseFen = V.ParseFen(ChessRules.GenRandInitFen(options));
     const positionParts = baseFen.position.split("/");
     const bFen = (
       "1" + positionParts[0] +
@@ -164,22 +163,22 @@ export class TencubedRules extends ChessRules {
 
   getPotentialMarshallMoves(sq) {
     return this.getSlideNJumpMoves(sq, V.steps[V.ROOK]).concat(
-      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep")
+      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], 1)
     );
   }
 
   getPotentialArchbishopMoves(sq) {
     return this.getSlideNJumpMoves(sq, V.steps[V.BISHOP]).concat(
-      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep")
+      this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], 1)
     );
   }
 
   getPotentialChampionMoves(sq) {
-    return this.getSlideNJumpMoves(sq, V.steps[V.CHAMPION], "oneStep");
+    return this.getSlideNJumpMoves(sq, V.steps[V.CHAMPION], 1);
   }
 
   getPotentialWizardMoves(sq) {
-    return this.getSlideNJumpMoves(sq, V.steps[V.WIZARD], "oneStep");
+    return this.getSlideNJumpMoves(sq, V.steps[V.WIZARD], 1);
   }
 
   isAttacked(sq, color) {
@@ -195,41 +194,28 @@ export class TencubedRules extends ChessRules {
   isAttackedByMarshall(sq, color) {
     return (
       this.isAttackedBySlideNJump(sq, color, V.MARSHALL, V.steps[V.ROOK]) ||
-      this.isAttackedBySlideNJump(
-        sq,
-        color,
-        V.MARSHALL,
-        V.steps[V.KNIGHT],
-        "oneStep"
-      )
+      this.isAttackedBySlideNJump(sq, color, V.MARSHALL, V.steps[V.KNIGHT], 1)
     );
   }
 
   isAttackedByArchbishop(sq, color) {
     return (
-      this.isAttackedBySlideNJump(sq, color, V.ARCHBISHOP, V.steps[V.BISHOP]) ||
       this.isAttackedBySlideNJump(
-        sq,
-        color,
-        V.ARCHBISHOP,
-        V.steps[V.KNIGHT],
-        "oneStep"
-      )
+        sq, color, V.ARCHBISHOP, V.steps[V.BISHOP])
+      ||
+      this.isAttackedBySlideNJump(
+        sq, color, V.ARCHBISHOP, V.steps[V.KNIGHT], 1)
     );
   }
 
   isAttackedByWizard(sq, color) {
-    return (
-      this.isAttackedBySlideNJump(
-        sq, color, V.WIZARD, V.steps[V.WIZARD], "oneStep")
-    );
+    return this.isAttackedBySlideNJump(
+      sq, color, V.WIZARD, V.steps[V.WIZARD], 1);
   }
 
   isAttackedByChampion(sq, color) {
-    return (
-      this.isAttackedBySlideNJump(
-        sq, color, V.CHAMPION, V.steps[V.CHAMPION], "oneStep")
-    );
+    return this.isAttackedBySlideNJump(
+      sq, color, V.CHAMPION, V.steps[V.CHAMPION], 1);
   }
 
   static get SEARCH_DEPTH() {
@@ -238,9 +224,13 @@ export class TencubedRules extends ChessRules {
 
   static get VALUES() {
     return Object.assign(
-      {},
-      ChessRules.VALUES,
-      { c: 4, w: 3, a: 6, m: 8 }
+      {
+        c: 4,
+        w: 3,
+        a: 6,
+        m: 8
+      },
+      ChessRules.VALUES
     );
   }
 
diff --git a/client/src/variants/Threechecks.js b/client/src/variants/Threechecks.js
index c297d0a4..038d2238 100644
--- a/client/src/variants/Threechecks.js
+++ b/client/src/variants/Threechecks.js
@@ -48,9 +48,9 @@ export class ThreechecksRules extends ChessRules {
     return super.getCurrentScore();
   }
 
-  static GenRandInitFen(randomness) {
+  static GenRandInitFen(options) {
     // Add check flags (at 0)
-    return ChessRules.GenRandInitFen(randomness).slice(0, -2) + "00";
+    return ChessRules.GenRandInitFen(options).slice(0, -2) + "00";
   }
 
   getFlagsFen() {
diff --git a/client/src/variants/Titan.js b/client/src/variants/Titan.js
index 4d71b857..425e08d8 100644
--- a/client/src/variants/Titan.js
+++ b/client/src/variants/Titan.js
@@ -154,6 +154,8 @@ export class TitanRules extends ChessRules {
     const [x, y] = [square[0], square[1]];
     if ((color == 'w' && x != 7) || (color == 'b' && x != 0)) return null;
     const selectedPiece = this.board[x][y][1];
+    // Prevent re-augmenting a chosen piece:
+    if (!ChessRules.PIECES.includes(selectedPiece)) return null;
     return new Move({
       appear: [
         new PiPo({
diff --git a/client/src/variants/Twokings.js b/client/src/variants/Twokings.js
index 6606da58..b5f2b059 100644
--- a/client/src/variants/Twokings.js
+++ b/client/src/variants/Twokings.js
@@ -55,8 +55,8 @@ export class TwokingsRules extends CoregalRules {
     return squares;
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
+  static GenRandInitFen(options) {
+    if (options.randomness == 0)
       return "rnqkkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNQKKBNR w 0 adehadeh -";
 
     const replaceBishop = (fen, first, ch1, ch2) => {
@@ -84,7 +84,7 @@ export class TwokingsRules extends CoregalRules {
     };
 
     const fen =
-      CoregalRules.GenRandInitFen(randomness)
+      CoregalRules.GenRandInitFen(options)
       .replace("q", "k").replace("Q", "K");
     // Now replace a bishop by the queen,
     // so that bishops are of different colors:
diff --git a/client/src/variants/Upsidedown.js b/client/src/variants/Upsidedown.js
index 43f38257..3149daea 100644
--- a/client/src/variants/Upsidedown.js
+++ b/client/src/variants/Upsidedown.js
@@ -12,13 +12,13 @@ export class UpsidedownRules extends ChessRules {
     return false;
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
+  static GenRandInitFen(options) {
+    if (options.randomness == 0)
       return "RNBQKBNR/PPPPPPPP/8/8/8/8/pppppppp/rnbqkbnr w 0";
 
     let pieces = { w: new Array(8), b: new Array(8) };
     for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
+      if (c == 'b' && options.randomness == 1) {
         pieces['b'] = pieces['w'];
         break;
       }
diff --git a/client/src/variants/Vchess.js b/client/src/variants/Vchess.js
index c12435c5..fc433729 100644
--- a/client/src/variants/Vchess.js
+++ b/client/src/variants/Vchess.js
@@ -12,12 +12,7 @@ export class VchessRules extends ChessRules {
 
   isAttackedByPawn(sq, color) {
     return this.isAttackedBySlideNJump(
-      sq,
-      color,
-      V.PAWN,
-      V.steps[V.BISHOP],
-      "oneStep"
-    );
+      sq, color, V.PAWN, V.steps[V.BISHOP], 1);
   }
 
   getNotation(move) {
diff --git a/client/src/variants/Wildebeest.js b/client/src/variants/Wildebeest.js
index 93353f9e..647a234a 100644
--- a/client/src/variants/Wildebeest.js
+++ b/client/src/variants/Wildebeest.js
@@ -181,15 +181,12 @@ export class WildebeestRules extends ChessRules {
   }
 
   getPotentialCamelMoves(sq) {
-    return this.getSlideNJumpMoves(sq, V.steps[V.CAMEL], "oneStep");
+    return this.getSlideNJumpMoves(sq, V.steps[V.CAMEL], 1);
   }
 
   getPotentialWildebeestMoves(sq) {
     return this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.KNIGHT].concat(V.steps[V.CAMEL]),
-      "oneStep"
-    );
+      sq, V.steps[V.KNIGHT].concat(V.steps[V.CAMEL]), 1);
   }
 
   getPPpath(m) {
@@ -276,22 +273,12 @@ export class WildebeestRules extends ChessRules {
 
   isAttackedByCamel(sq, color) {
     return this.isAttackedBySlideNJump(
-      sq,
-      color,
-      V.CAMEL,
-      V.steps[V.CAMEL],
-      "oneStep"
-    );
+      sq, color, V.CAMEL, V.steps[V.CAMEL], 1);
   }
 
   isAttackedByWildebeest(sq, color) {
     return this.isAttackedBySlideNJump(
-      sq,
-      color,
-      V.WILDEBEEST,
-      V.steps[V.KNIGHT].concat(V.steps[V.CAMEL]),
-      "oneStep"
-    );
+      sq, color, V.WILDEBEEST, V.steps[V.KNIGHT].concat(V.steps[V.CAMEL]), 1);
   }
 
   getCurrentScore() {
@@ -311,8 +298,8 @@ export class WildebeestRules extends ChessRules {
     return 2;
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0) {
+  static GenRandInitFen(options) {
+    if (options.randomness == 0) {
       return (
         "rnccwkqbbnr/ppppppppppp/92/92/92/92/92/92/PPPPPPPPPPP/RNBBQKWCCNR " +
         "w 0 akak -"
@@ -322,7 +309,7 @@ export class WildebeestRules extends ChessRules {
     let pieces = { w: new Array(11), b: new Array(11) };
     let flags = "";
     for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
+      if (c == 'b' && options.randomness == 1) {
         pieces['b'] = pieces['w'];
         flags += flags;
         break;
diff --git a/client/src/variants/Wormhole1.js b/client/src/variants/Wormhole1.js
index 11901119..5d838b46 100644
--- a/client/src/variants/Wormhole1.js
+++ b/client/src/variants/Wormhole1.js
@@ -73,8 +73,8 @@ export class Wormhole1Rules extends Wormhole2Rules {
     };
   }
 
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
+  static GenRandInitFen(options) {
+    if (options.randomness == 0)
       return "cnwmkwnc/pppppppp/8/8/8/8/PPPPPPPP/CNWMKWNC w 0";
 
     // Mapping new --> standard:
@@ -86,7 +86,7 @@ export class Wormhole1Rules extends Wormhole2Rules {
       'k': 'k'
     };
 
-    const baseFen = ChessRules.GenRandInitFen(randomness);
+    const baseFen = ChessRules.GenRandInitFen(options);
     return (
       baseFen.substr(0, 8).split('').map(p => piecesMap[p]).join('') +
       baseFen.substr(8, 27) +
diff --git a/client/src/variants/Xiangqi.js b/client/src/variants/Xiangqi.js
index 6215ea9b..4fef5653 100644
--- a/client/src/variants/Xiangqi.js
+++ b/client/src/variants/Xiangqi.js
@@ -2,6 +2,10 @@ import { ChessRules } from "@/base_rules";
 
 export class XiangqiRules extends ChessRules {
 
+  static get Options() {
+    return null;
+  }
+
   // NOTE (TODO?) scanKings() could be more efficient (in Jangqi too)
 
   static get Monochrome() {
@@ -154,7 +158,7 @@ export class XiangqiRules extends ChessRules {
       if (y > 0) steps.push([0, -1]);
       if (y < 9) steps.push([0, 1]);
     }
-    return super.getSlideNJumpMoves([x, y], steps, "oneStep");
+    return super.getSlideNJumpMoves([x, y], steps, 1);
   }
 
   knightStepsFromRookStep(step) {
@@ -172,7 +176,7 @@ export class XiangqiRules extends ChessRules {
           this.knightStepsFromRookStep(rookStep));
       }
     }
-    return super.getSlideNJumpMoves([x, y], steps, "oneStep");
+    return super.getSlideNJumpMoves([x, y], steps, 1);
   }
 
   getPotentialElephantMoves([x, y]) {
@@ -188,7 +192,7 @@ export class XiangqiRules extends ChessRules {
           // "out of board" checks delayed to next method
       }
     }
-    return super.getSlideNJumpMoves([x, y], steps, "oneStep");
+    return super.getSlideNJumpMoves([x, y], steps, 1);
   }
 
   getPotentialAdvisorMoves([x, y]) {
@@ -212,11 +216,11 @@ export class XiangqiRules extends ChessRules {
         if (y == 3) step = [-direction, 1];
         else step = [-direction, -1];
       }
-      return super.getSlideNJumpMoves([x, y], [step], "oneStep");
+      return super.getSlideNJumpMoves([x, y], [step], 1);
     }
     // In the middle of the palace:
     return (
-      super.getSlideNJumpMoves([x, y], ChessRules.steps[V.BISHOP], "oneStep")
+      super.getSlideNJumpMoves([x, y], ChessRules.steps[V.BISHOP], 1)
     );
   }
 
@@ -234,11 +238,11 @@ export class XiangqiRules extends ChessRules {
       if (x > (c == 'w' ? V.size.x - 3 : 0)) steps.push([-1, 0]);
       if (y > 3) steps.push([0, -1]);
       if (y < 5) steps.push([0, 1]);
-      return super.getSlideNJumpMoves([x, y], steps, "oneStep");
+      return super.getSlideNJumpMoves([x, y], steps, 1);
     }
     // In the middle of the palace:
     return (
-      super.getSlideNJumpMoves([x, y], ChessRules.steps[V.ROOK], "oneStep")
+      super.getSlideNJumpMoves([x, y], ChessRules.steps[V.ROOK], 1)
     );
   }
 
@@ -283,7 +287,7 @@ export class XiangqiRules extends ChessRules {
     // The pawn necessarily crossed the river (attack on king)
     const shiftX = (color == 'w' ? 1 : -1); //shift from king
     return super.isAttackedBySlideNJump(
-      [x, y], color, V.PAWN, [[shiftX, 0], [0, 1], [0, -1]], "oneStep");
+      [x, y], color, V.PAWN, [[shiftX, 0], [0, 1], [0, -1]], 1);
   }
 
   knightStepsFromBishopStep(step) {
@@ -303,7 +307,7 @@ export class XiangqiRules extends ChessRules {
       }
     }
     return (
-      super.isAttackedBySlideNJump([x, y], color, V.KNIGHT, steps, "oneStep")
+      super.isAttackedBySlideNJump([x, y], color, V.KNIGHT, steps, 1)
     );
   }
 
diff --git a/client/src/variants/Yote.js b/client/src/variants/Yote.js
index 4e53fe91..6863026e 100644
--- a/client/src/variants/Yote.js
+++ b/client/src/variants/Yote.js
@@ -3,6 +3,10 @@ import { randInt } from "@/utils/alea";
 
 export class YoteRules extends ChessRules {
 
+  static get Options() {
+    return null;
+  }
+
   static get HasFlags() {
     return false;
   }
@@ -72,7 +76,7 @@ export class YoteRules extends ChessRules {
     );
   }
 
-  static GenRandInitFen(randomness) {
+  static GenRandInitFen() {
     return "6/6/6/6/6 w 0 12,12 -,-";
   }
 
diff --git a/client/src/variants/Zen.js b/client/src/variants/Zen.js
index 7edbe40a..bfbc7e29 100644
--- a/client/src/variants/Zen.js
+++ b/client/src/variants/Zen.js
@@ -27,24 +27,6 @@ export class ZenRules extends ChessRules {
     return undefined;
   }
 
-  // TODO(?): some duplicated code in 2 next functions
-  getSlideNJumpMoves([x, y], steps, oneStep) {
-    let moves = [];
-    outerLoop: for (let loop = 0; loop < steps.length; loop++) {
-      const step = steps[loop];
-      let i = x + step[0];
-      let j = y + step[1];
-      while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
-        moves.push(this.getBasicMove([x, y], [i, j]));
-        if (oneStep) continue outerLoop;
-        i += step[0];
-        j += step[1];
-      }
-      // No capture check: handled elsewhere (next method)
-    }
-    return moves;
-  }
-
   // follow steps from x,y until something is met.
   // if met piece is opponent and same movement (asA): eat it!
   findCaptures_aux([x, y], asA) {
@@ -110,7 +92,7 @@ export class ZenRules extends ChessRules {
     return moves;
   }
 
-  canTake(sq1, sq2) {
+  canTake() {
     return false; //captures handled separately
   }
 
diff --git a/client/src/views/Game.vue b/client/src/views/Game.vue
index a2afb09d..bbc6484a 100644
--- a/client/src/views/Game.vue
+++ b/client/src/views/Game.vue
@@ -333,6 +333,29 @@ export default {
         )
       );
     },
+    requestLastate: function(sid) {
+      // TODO: maybe also find opponent SID ?
+      //const oppSid =
+      //  this.game.players.find(p => p.sid != this.st.user.sid).sid;
+      this.send("asklastate", { target: sid });
+      let counter = 1;
+      this.askLastate = setInterval(
+        () => {
+          // Ask at most 3 times:
+          // if no reply after that there should be a network issue.
+          if (
+            counter < 3 &&
+            !this.gotLastate &&
+            !!this.people[sid]
+          ) {
+            this.send("asklastate", { target: sid });
+            counter++;
+          }
+          else clearInterval(this.askLastate);
+        },
+        1500
+      );
+    },
     atCreation: function() {
       document.addEventListener('visibilitychange', this.visibilityChange);
       window.addEventListener('focus', this.onFocus);
@@ -395,6 +418,8 @@ export default {
               "message", this.socketMessageListener);
             this.conn = new WebSocket(this.connexionString);
             this.conn.addEventListener("message", this.socketMessageListener);
+            const oppSid = this.getOppsid();
+            if (!!oppSid) this.requestLaststate(oppSid); //in case of
           }
         },
         1000
@@ -672,24 +697,7 @@ export default {
             this.game.type == "live" &&
             this.game.players.some(p => p.sid == user.sid)
           ) {
-            this.send("asklastate", { target: user.sid });
-            let counter = 1;
-            this.askLastate = setInterval(
-              () => {
-                // Ask at most 3 times:
-                // if no reply after that there should be a network issue.
-                if (
-                  counter < 3 &&
-                  !this.gotLastate &&
-                  !!this.people[user.sid]
-                ) {
-                  this.send("asklastate", { target: user.sid });
-                  counter++;
-                }
-                else clearInterval(this.askLastate);
-              },
-              1500
-            );
+            this.requestLaststate(user.sid);
           }
           break;
         }
diff --git a/client/src/views/Hall.vue b/client/src/views/Hall.vue
index 05ee05b5..224d5d21 100644
--- a/client/src/views/Hall.vue
+++ b/client/src/views/Hall.vue
@@ -52,8 +52,8 @@ main
             )
               | {{ v.display }}
         // Variant-specific options (often at least randomness)
-        fieldset(v-if="!!newchallenge.V")
-          div(v-for="select of newchallenge.V.Options.select")
+        fieldset(v-if="!!newchallenge.V && newchallenge.V.Options")
+          div(v-for="select of newchallenge.V.Options.select || []")
             label(:for="select.variable + '_opt'") {{ st.tr[select.label] }} *
             select(:id="select.variable + '_opt'")
               option(
@@ -62,7 +62,7 @@ main
                 :selected="o.value == select.defaut"
               )
                 | {{ st.tr[o.label] }}
-          div(v-for="check of newchallenge.V.Options.check")
+          div(v-for="check of newchallenge.V.Options.check || []")
             label(:for="check.variable + '_opt'") {{ st.tr[check.label] }} *
             input(
               :id="check.variable + '_opt'"
@@ -300,10 +300,6 @@ export default {
     }
   },
   created: function() {
-    // TODO: remove this patch soon:
-    this.presetChalls.forEach(pc => {
-      if (!pc.options) pc.options = { randomness: pc.randomness };
-    });
     document.addEventListener('visibilitychange', this.visibilityChange);
     window.addEventListener('focus', this.onFocus);
     window.addEventListener('blur', this.onBlur);
@@ -479,16 +475,12 @@ export default {
       this.conn = null;
     },
     getRandomnessClass: function(pc) {
-      if (
-        // TODO: one extra test here
-        !Number.isInteger(pc.options.randomness) &&
-        !parseInt(pc.options.randomness, 10)
-      ) {
+      const opts = pc.options;
+      if (opts.randomness === undefined && opts.random === undefined)
         return {};
-      }
-      return {
-        ["random-" + pc.options.randomness]: true
-      };
+      if (opts.randomness !== undefined)
+        return { ["random-" + opts.randomness]: true };
+      return { ["random-" + (opts.random ? 2 : 0)]: true };
     },
     anonymousCount: function() {
       let count = 0;
@@ -1090,30 +1082,29 @@ export default {
           error = this.st.tr["Wrong color"];
         }
       }
-      if (!!error) {
-        alert(error);
-        return;
-      }
-      window.V = this.newchallenge.V;
-      error = checkChallenge(this.newchallenge);
       if (error) {
         alert(error);
         return;
       }
-      // NOTE: "from" information is not required here
-      let chall = Object.assign({}, this.newchallenge);
-      chall.options = {};
+      window.V = this.newchallenge.V;
+      let chall = Object.assign({ options: {} }, this.newchallenge);
       // Get/set options variables (if any) / TODO: v-model?!
-      for (const check of this.newchallenge.V.Options.check) {
+      for (const check of this.newchallenge.V.Options.check || []) {
         const elt = document.getElementById(check.variable + "_opt");
         if (elt.checked) chall.options[check.variable] = true;
       }
-      for (const select of this.newchallenge.V.Options.select) {
+      for (const select of this.newchallenge.V.Options.select || []) {
         const elt = document.getElementById(select.variable + "_opt");
-        chall.options[select.variable] = elt.value;
+        chall.options[select.variable] = parseInt(elt.value, 10) || elt.value;
+      }
+      error = checkChallenge(chall);
+      if (error) {
+        alert(this.st.tr[error]);
+        return;
       }
       chall.options.abridged = V.AbbreviateOptions(chall.options);
       // Add only if not already issued (not counting FEN):
+      // NOTE: "from" information is not required here
       if (this.challenges.some(c =>
         (
           c.from.sid == this.st.user.sid ||
diff --git a/client/src/views/Rules.vue b/client/src/views/Rules.vue
index fc3a0cd9..d668ebae 100644
--- a/client/src/views/Rules.vue
+++ b/client/src/views/Rules.vue
@@ -8,9 +8,9 @@ main
     .card
       label.modal-close(for="modalOptions")
       h3 {{ st.tr["Options"] }}
-      fieldset(v-if="!!V")
-        div(v-for="select of V.Options.select")
-          label(:for="select.variable + '_opt'") {{ st.tr[select.label] }} *
+      fieldset(v-if="!!V && V.Options")
+        div(v-for="select of V.Options.select || []")
+          label(:for="select.variable + '_opt'") {{ st.tr[select.label] }}
           select(:id="select.variable + '_opt'")
             option(
               v-for="o of select.options"
@@ -18,8 +18,8 @@ main
               :selected="o.value == select.defaut"
             )
               | {{ st.tr[o.label] }}
-        div(v-for="check of V.Options.check")
-          label(:for="check.variable + '_opt'") {{ st.tr[check.label] }} *
+        div(v-for="check of V.Options.check || []")
+          label(:for="check.variable + '_opt'") {{ st.tr[check.label] }}
           input(
             :id="check.variable + '_opt'"
             type="checkbox"
@@ -150,13 +150,17 @@ export default {
     setOptions: function() {
       let options = {};
       // Get/set options variables / TODO: v-model?!
-      for (const check of this.V.Options.check) {
+      for (const check of this.V.Options.check || []) {
         const elt = document.getElementById(check.variable + "_opt");
         if (elt.checked) options[check.variable] = true;
       }
-      for (const select of this.V.Options.select) {
+      for (const select of this.V.Options.select || []) {
         const elt = document.getElementById(select.variable + "_opt");
-        options[select.variable] = elt.value;
+        options[select.variable] = parseInt(elt.value, 10) || elt.value;
+      }
+      if (!V.IsValidOptions(options)) {
+        alert(this.st.tr["Invalid options"]);
+        return;
       }
       document.getElementById("modalOptions").checked = false;
       if (this.whatNext == "analyze") this.gotoAnalyze(options);
@@ -186,12 +190,12 @@ export default {
             CompgameStorage.remove(game.vname);
             game = null;
           }
-          if (!!game || Object.keys(V.Options).length == 0) next(game);
+          if (!!game || !V.Options) next(game);
           else askOptions();
         });
       }
       else {
-        if (Object.keys(V.Options).length == 0) next();
+        if (!V.Options) next();
         else askOptions();
       }
     },
@@ -206,7 +210,7 @@ export default {
         CompgameStorage.remove(this.gameInfo.vname);
     },
     gotoAnalyze: function(options) {
-      if (!options && Object.keys(V.Options).length > 0) {
+      if (!options && V.Options) {
         this.whatNext = "analyze";
         doClick("modalOptions");
       }
diff --git a/client/src/views/Variants.vue b/client/src/views/Variants.vue
index f60e5f1d..8de335e6 100644
--- a/client/src/views/Variants.vue
+++ b/client/src/views/Variants.vue
@@ -16,7 +16,7 @@ main
         h3 {{ st.tr["vt" + g] }}
         p {{ st.tr["vg" + g] }}
         ul
-          li(v-for="v of variantGroup.get(g)")
+          li(v-for="v of sortVariants(variantGroup.get(g))")
             a(:href="getLink(v)") {{ v.display }}
             | &nbsp&ndash;&nbsp;
             | {{ st.tr[v.description] }}
@@ -59,6 +59,9 @@ export default {
     }
   },
   methods: {
+    sortVariants: function(group) {
+      return group.sort( (v1, v2) => v1.name.localeCompare(v2.name) );
+    },
     // oninput listener, required for smartphones:
     setCurPrefix: function(e) {
       this.curPrefix = e.target.value;