From: Benjamin Auder <benjamin.auder@somewhere>
Date: Tue, 24 Mar 2020 00:37:00 +0000 (+0100)
Subject: Better Ball rules. Buggish but almost OK Synchrone variant
X-Git-Url: https://git.auder.net/%7B%7B%20asset%28%27mixstore/css/img/pieces/current/mini-custom.min.css?a=commitdiff_plain;h=d54f6261c9e30f4eabb402ad301dd5c5e40fb656;p=vchess.git

Better Ball rules. Buggish but almost OK Synchrone variant
---

diff --git a/TODO b/TODO
index 819ebc87..8d3eabcf 100644
--- a/TODO
+++ b/TODO
@@ -1,4 +1,6 @@
 # New variants
+Doublearmy: 2 kings remaining get mated.
+
 Landing pieces from empty board:
 https://www.chessvariants.com/diffsetup.dir/unachess.html
 Parachute v1 & 2
@@ -12,10 +14,6 @@ Goal is still checkmate.
 Take(a)n(d)make : if capture a piece, take its power for the last of the turn and make a move like it.
 If a pawn taken: direction of the capturer.
 
-Maxima, Interweave, Roccoco
-
-Synchrone Chess: allow to anticipate en-passant capture as well :)
-
 Dynamo chess
 
-Omega chess (ask first)
+Maxima, Interweave, Roccoco
diff --git a/client/README.md b/client/README.md
index 25bf68eb..1aa3c003 100644
--- a/client/README.md
+++ b/client/README.md
@@ -32,8 +32,9 @@ See [Configuration Reference](https://cli.vuejs.org/config/).
 
 ## Resources
 
- - Vue.js + Vue router + Webpack,
- - mini.css,
- - Google font 'Open Sans'
+- Vue.js + Vue router,
+- Webpack,
+- mini.css
 
 Sounds and pieces images where found at various locations.
+Fonts were found on Google Fonts.
diff --git a/client/public/images/pieces/Ball/bd.svg b/client/public/images/pieces/Ball/bd.svg
new file mode 100644
index 00000000..8c5339cc
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@@ -0,0 +1,103 @@
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diff --git a/client/public/images/pieces/Ball/bh.svg b/client/public/images/pieces/Ball/bh.svg
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-     d="m 49.874704,48.947941 c -1.62438,-0.254414 -2.847813,-0.78581 -3.528712,-1.532692 -0.714994,-0.784279 -0.944946,-1.641793 -0.944946,-3.523791 v -1.189555 l 0.419697,-0.494686 c 0.900468,-1.061359 1.50766,-2.258013 1.905099,-3.754568 0.194192,-0.73123 0.20537,-1.025763 0.239494,-6.310295 l 0.03579,-5.543264 0.648216,0.605501 c 1.120372,1.046545 2.359393,1.633234 3.71809,1.760554 l 0.69917,0.06552 0.02634,7.060026 0.02634,7.060025 0.25421,0.542232 c 0.628507,1.340615 2.252246,2.144207 3.380252,1.672896 0.205675,-0.08594 0.393299,-0.136905 0.416941,-0.113262 0.09571,0.09571 -0.304478,1.052683 -0.66763,1.596507 -0.612681,0.917499 -1.641424,1.59072 -3.000257,1.963406 -0.67861,0.186121 -2.799119,0.265286 -3.628108,0.135448 z"
-     id="path45"
-     inkscape:connector-curvature="0" /><path
-     style="fill:#ffcc00;fill-opacity:1;stroke-width:0.09587888"
-     d="m 32.458121,50.41354 c 0.0012,-0.619314 0.189433,-1.556535 0.405963,-2.021822 0.114426,-0.245882 0.447574,-0.688129 0.740327,-0.98277 0.680059,-0.684444 1.33942,-0.950412 2.356162,-0.950412 h 0.715494 v 0.806177 0.806177 l -1.436162,0.03276 c -1.396149,0.03185 -1.443059,0.03966 -1.68367,0.280429 -0.180954,0.18107 -0.248935,0.351207 -0.252821,0.632739 -0.01071,0.776092 0.284708,0.989234 1.371097,0.989234 0.800802,0 0.791899,0.09178 -0.04742,0.488853 -0.500532,0.236793 -0.705004,0.278038 -1.378693,0.278102 l -0.791001,7.6e-5 7.24e-4,-0.359546 z"
-     id="path47"
-     inkscape:connector-curvature="0" /><path
-     style="fill:#ffcc00;fill-opacity:1;stroke-width:0.09587888"
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-     style="fill:#ffcc00;fill-opacity:1;stroke-width:0.09587888"
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\ No newline at end of file
diff --git a/client/public/index.html b/client/public/index.html
index f93aa0e3..2219fe01 100644
--- a/client/public/index.html
+++ b/client/public/index.html
@@ -14,6 +14,8 @@
     <link rel="stylesheet" href="mini-custom.min.css">
     <link rel="stylesheet"
       href="//fonts.googleapis.com/css?family=Open+Sans:400,700">
+    <link rel="stylesheet"
+      href="https://fonts.googleapis.com/css?family=Fira+Code&display=swap">
   </head>
   <body>
     <div id="app"></div>
diff --git a/client/src/base_rules.js b/client/src/base_rules.js
index 52ec2c54..448604a4 100644
--- a/client/src/base_rules.js
+++ b/client/src/base_rules.js
@@ -85,6 +85,15 @@ export const ChessRules = class ChessRules {
     return V.CanFlip;
   }
 
+  // Some variants require turn indicator
+  // (generally when analysis or flip is diabled)
+  static get ShowTurn() {
+    return !V.CanAnalyze || V.ShowMoves != "all" || !V.CanFlip;
+  }
+  get showTurn() {
+    return V.ShowTurn;
+  }
+
   static get IMAGE_EXTENSION() {
     // All pieces should be in the SVG format
     return ".svg";
@@ -1284,8 +1293,8 @@ export const ChessRules = class ChessRules {
     }
 
     let candidates = [0];
-    for (let j = 1; j < moves1.length && moves1[j].eval == moves1[0].eval; j++)
-      candidates.push(j);
+    for (let i = 1; i < moves1.length && moves1[i].eval == moves1[0].eval; i++)
+      candidates.push(i);
     return moves1[candidates[randInt(candidates.length)]];
   }
 
diff --git a/client/src/components/BaseGame.vue b/client/src/components/BaseGame.vue
index a49c31b1..2517c78a 100644
--- a/client/src/components/BaseGame.vue
+++ b/client/src/components/BaseGame.vue
@@ -103,15 +103,13 @@ export default {
     showTurn: function() {
       return (
         this.game.score == '*' &&
-        this.vr &&
-        (this.vr.showMoves != "all" || !this.vr.canFlip)
+        !!this.vr && this.vr.showTurn
       );
     },
     turn: function() {
-      if (!this.vr)
-        return "";
+      if (!this.vr) return "";
       if (this.vr.showMoves != "all")
-        return this.st.tr[(this.vr.turn == 'w' ? "White" : "Black") + " to move"]
+        return this.st.tr[(this.vr.turn == 'w' ? "White" : "Black") + " to move"];
       // Cannot flip: racing king or circular chess
       return this.vr.movesCount == 0 && this.game.mycolor == "w"
         ? this.st.tr["It's your turn!"]
diff --git a/client/src/components/Board.vue b/client/src/components/Board.vue
index 921a5998..d89ee404 100644
--- a/client/src/components/Board.vue
+++ b/client/src/components/Board.vue
@@ -55,6 +55,10 @@ export default {
       this.settings.highlight &&
       ["all","highlight"].includes(V.ShowMoves)
     );
+    const showCheck = (
+      this.settings.highlight &&
+      ["all","highlight","byrow"].includes(V.ShowMoves)
+    );
     const orientation = !V.CanFlip ? "w" : this.orientation;
     // Ensure that squares colors do not change when board is flipped
     const lightSquareMod = (sizeX + sizeY) % 2;
@@ -149,8 +153,8 @@ export default {
                   "in-shadow": inShadow(ci, cj),
                   "highlight-light": inHighlight(ci, cj) && lightSquare,
                   "highlight-dark": inHighlight(ci, cj) && !lightSquare,
-                  "incheck-light": showLight && lightSquare && incheckSq[ci][cj],
-                  "incheck-dark": showLight && !lightSquare && incheckSq[ci][cj]
+                  "incheck-light": showCheck && lightSquare && incheckSq[ci][cj],
+                  "incheck-dark": showCheck && !lightSquare && incheckSq[ci][cj]
                 },
                 attrs: {
                   id: getSquareId({ x: ci, y: cj })
diff --git a/client/src/translations/about/en.pug b/client/src/translations/about/en.pug
index c6b32fba..6d551949 100644
--- a/client/src/translations/about/en.pug
+++ b/client/src/translations/about/en.pug
@@ -42,9 +42,10 @@ p.
 h3 Related links
 
 #links
-  a(href="https://greenchess.net/") greenchess.net
   a(href="https://www.chessvariants.com/") chessvariants.com
-  a(href="http://pychess-variants.herokuapp.com/") pychess-variants
+  a(href="https://greenchess.net/") greenchess.net
+  a(href="http://pychess-variants.herokuapp.com/") pychess-variants.com
+  a(href="https://musketeerchess.net/home/index.html") musketeerchess.net
   a(href="https://schemingmind.com/") schemingmind.com
   div
     a(href="https://echekk.fr/spip.php?page=rubrique&id_rubrique=1") echekk.fr
diff --git a/client/src/translations/about/es.pug b/client/src/translations/about/es.pug
index eb53940c..66aa4298 100644
--- a/client/src/translations/about/es.pug
+++ b/client/src/translations/about/es.pug
@@ -39,9 +39,10 @@ p
 h3 Enlaces relacionados
 
 #links
-  a(href="https://greenchess.net/") greenchess.net
   a(href="https://www.chessvariants.com/") chessvariants.com
-  a(href="http://pychess-variants.herokuapp.com/") pychess-variants
+  a(href="https://greenchess.net/") greenchess.net
+  a(href="http://pychess-variants.herokuapp.com/") pychess-variants.com
+  a(href="https://musketeerchess.net/home/index.html") musketeerchess.net
   a(href="https://schemingmind.com/") schemingmind.com
   div
     a(href="https://echekk.fr/spip.php?page=rubrique&id_rubrique=1") echekk.fr
diff --git a/client/src/translations/about/fr.pug b/client/src/translations/about/fr.pug
index 3197837c..b4236030 100644
--- a/client/src/translations/about/fr.pug
+++ b/client/src/translations/about/fr.pug
@@ -40,9 +40,10 @@ p.
 h3 Liens connexes
 
 #links
-  a(href="https://greenchess.net/") greenchess.net
   a(href="https://www.chessvariants.com/") chessvariants.com
-  a(href="http://pychess-variants.herokuapp.com/") pychess-variants
+  a(href="https://greenchess.net/") greenchess.net
+  a(href="http://pychess-variants.herokuapp.com/") pychess-variants.com
+  a(href="https://musketeerchess.net/home/index.html") musketeerchess.net
   a(href="https://schemingmind.com/") schemingmind.com
   a(href="https://echekk.fr/spip.php?page=rubrique&id_rubrique=1") echekk.fr
   a(href="https://brainking.com/") brainking.com
diff --git a/client/src/translations/rules/Ball/en.pug b/client/src/translations/rules/Ball/en.pug
index 49005d8a..3525359f 100644
--- a/client/src/translations/rules/Ball/en.pug
+++ b/client/src/translations/rules/Ball/en.pug
@@ -12,17 +12,21 @@ ul
     disappear and grab the ball.
   li "Capturing" a friendly unit pass the ball to it.
 
+p.
+  All pieces represent players on a field of some ball game,
+  so they can move up to two squares only for a better realism.
+
 figure.diagram-container
   .diagram.diag12
-    | fen:rnbqkwnbr/ppppp1ppp/9/5p3/4a4/9/2N4N1/PPPPPPPPP/R1BQKW1BR:
+    | fen:rnbhq1nbr/ppppppppp/5h3/9/4a4/5P3/9/PPPPP1PPP/RNBHQHNBR:
   .diagram.diag22
-    | fen:rnbqkwnbr/ppppp1ppp/9/9/4s4/9/2N4N1/PPPPPPPPP/R1BQKW1BR:
-  figcaption Left: before ...fxe5 (taking ball). Right: after ...fxe5.
+    | fen:rnbhq1nbr/ppppppppp/5h3/9/4S4/9/9/PPPPP1PPP/RNBHQHNBR:
+  figcaption Left: before fxe5 (taking ball). Right: after fxe5.
 
 p.
-  The piece sitting to the right of the king is a wildebeest (W).
-  It moves by jumping in L like a knight, or a little bit further:
-  three squares in one direction then one aside.
+  The piece sitting next to the queen is a champion (H).
+  It moves by jumping two squares in any direction (potentially over pieces),
+  or one square orthogonally.
 
 h3 End of the game
 
@@ -32,16 +36,16 @@ p.
 
 figure.diagram-container
   .diagram.diag12
-    | fen:rqnkb1nb1/pp1pppp1r/2p5p/4wW1p1/4S4/1P5B1/9/P1PPP1PPP/RQNK2NBR:
+    | fen:3rn1r2/1pp3pbp/2hp2n2/p1b1pp1p1/P6P1/2N3P1P/1PP2N3/1RB1qPd2/1R2BH1HQ:
   .diagram.diag22
-    | fen:rqnkb1nb1/pp1pppp1r/2p5p/4wY1p1/4P4/1P5B1/9/P1PPP1PPP/RQNK2NBR:
+    | fen:3rn1r2/1pp3pbp/2hp2n2/p1b1pp1p1/P6P1/2N3P1P/1PP2N3/1RB1tPh2/1R2BH1HQ:
   figcaption.
-    Left: before e5Pf6 (passing the ball).
-    Right: after the move. Then Wxe9# cannot be prevented.
+    Left: before g2Pe2 (passing the ball).
+    Right: after the move. Then ...Q(x)d1# cannot be prevented.
 
 p.
-  White pass the ball from the pawn at e5 to the wildebeest at f6.
-  Then, since the black bishop on e8 cannot move white will win by taking it: Wxe9#.
+  The black champion on g2 passes the ball to the black queen on e2.
+  Victory is then garanteed by playing a queen move on the first rank.
 
 h3 Source
 
diff --git a/client/src/translations/rules/Ball/es.pug b/client/src/translations/rules/Ball/es.pug
index 42922c47..cef6fa62 100644
--- a/client/src/translations/rules/Ball/es.pug
+++ b/client/src/translations/rules/Ball/es.pug
@@ -12,19 +12,23 @@ ul
     mientras lo hace desaparecer.
   li "Capturar" una pieza amiga le pasa la pelota.
 
+p.
+  Todas las piezas representan jugadores en un área de juego de pelota,
+  entonces solo se mueven dos casillas como máximo para un mejor realismo.
+
 figure.diagram-container
   .diagram.diag12
-    | fen:rnbqkwnbr/ppppp1ppp/9/5p3/4a4/9/2N4N1/PPPPPPPPPP/R1BQKW1BR:
+    | fen:rnbhq1nbr/ppppppppp/5h3/9/4a4/5P3/9/PPPPP1PPP/RNBHQHNBR:
   .diagram.diag22
-    | fen:rnbqkwnbr/ppppp1ppp/9/9/4s4/9/2N4N1/PPPPPPPPPP/R1BQKW1BR:
+    | fen:rnbhq1nbr/ppppppppp/5h3/9/4S4/9/9/PPPPP1PPP/RNBHQHNBR:
   figcaption.
-    Izquierda: antes de ...fxe5 (tomando la pelota).
-    Derecha: después de ...fxe5.
+    Izquierda: antes de fxe5 (tomando la pelota).
+    Derecha: después de fxe5.
 
 p.
-  La pieza a la derecha del rey es un ñu (W).
-  Se mueve realizando saltos en forma de L como el caballo,
-  o un poco más alargado: tres casillas y luego una en el lateral.
+  La pieza al lado de la dama es un campeón (H).
+  Se mueve saltando dos casillas en cualquier dirección
+  (potencialmente sobre piezas), o una casilla ortogonalmente.
 
 h3 Fin de la partida
 
@@ -34,17 +38,16 @@ p.
 
 figure.diagram-container
   .diagram.diag12
-    | fen:rqnkb1nb1/pp1pppp1r/2p5p/4wW1p1/4S4/1P5B1/9/P1PPP1PPP/RQNK2NBR:
+    | fen:3rn1r2/1pp3pbp/2hp2n2/p1b1pp1p1/P6P1/2N3P1P/1PP2N3/1RB1qPd2/1R2BH1HQ:
   .diagram.diag22
-    | fen:rqnkb1nb1/pp1pppp1r/2p5p/4wY1p1/4P4/1P5B1/9/P1PPP1PPP/RQNK2NBR:
+    | fen:3rn1r2/1pp3pbp/2hp2n2/p1b1pp1p1/P6P1/2N3P1P/1PP2N3/1RB1tPh2/1R2BH1HQ:
   figcaption.
-    Izquierda: antes de e5Pf6 (pasando el globo).
-    Derecha: después del movimiento. Entonces Wxe9# no se puede prevenir.
+    Izquierda: antes de g2Pe2 (pasando el globo).
+    Derecha: después del movimiento. Entonces Q(x)d1# no se puede prevenir.
 
 p.
-  Las blancas pasan la pelota del peón e5 al ñu en f6.
-  Entonces, como el alfil negro no puede moverse,
-  la victoria está asegurada capturándolo con Wxe9#.
+  Las negras pasan el balón del campeón g2 a la dama en e2.
+  La victoria se asegura al jugar un movimiento de dama en la primera fila.
 
 h3 Fuente
 
diff --git a/client/src/translations/rules/Ball/fr.pug b/client/src/translations/rules/Ball/fr.pug
index 070021d2..314bc5f1 100644
--- a/client/src/translations/rules/Ball/fr.pug
+++ b/client/src/translations/rules/Ball/fr.pug
@@ -12,17 +12,23 @@ ul
     tout en la faisant disparaître.
   li "Capturer" une pièce amie lui passe le ballon.
 
+p.
+  Toutes les pièces représentent des joueurs sur un terrain d'un certain
+  jeu de ballon, donc elles ne se déplacent que de deux cases au maximum
+  pour un meilleur réalisme.
+
 figure.diagram-container
   .diagram.diag12
-    | fen:rnbqkwnbr/ppppp1ppp/9/5p3/4a4/9/2N4N1/PPPPPPPPP/R1BQKW1BR:
+    | fen:rnbhq1nbr/ppppppppp/5h3/9/4a4/5P3/9/PPPPP1PPP/RNBHQHNBR:
   .diagram.diag22
-    | fen:rnbqkwnbr/ppppp1ppp/9/9/4s4/9/2N4N1/PPPPPPPPP/R1BQKW1BR:
-  figcaption Gauche : avant ...fxe5 (prenant le ballon). Droite : après ...fxe5.
+    | fen:rnbhq1nbr/ppppppppp/5h3/9/4S4/9/9/PPPPP1PPP/RNBHQHNBR:
+  figcaption Gauche : avant fxe5 (prenant le ballon). Droite : après fxe5.
 
 p.
-  La pièce située à droite du roi est un gnou (W).
-  Il se déplace en effectuant des sauts en L comme le cavalier,
-  ou bien un peu plus allongés : trois cases puis une sur le côté.
+  La pièce située à côté de la dame est un champion (H).
+  Il se déplace en effectuant des sauts de deux cases dans n'importe
+  quelle direction (potentiellement par dessus des pièces),
+  ou d'une case orthogonalement.
 
 h3 Fin de la partie
 
@@ -32,17 +38,17 @@ p.
 
 figure.diagram-container
   .diagram.diag12
-    | fen:rqnkb1nb1/pp1pppp1r/2p5p/4wW1p1/4S4/1P5B1/9/P1PPP1PPP/RQNK2NBR:
+    | fen:3rn1r2/1pp3pbp/2hp2n2/p1b1pp1p1/P6P1/2N3P1P/1PP2N3/1RB1qPd2/1R2BH1HQ:
   .diagram.diag22
-    | fen:rqnkb1nb1/pp1pppp1r/2p5p/4wY1p1/4P4/1P5B1/9/P1PPP1PPP/RQNK2NBR:
+    | fen:3rn1r2/1pp3pbp/2hp2n2/p1b1pp1p1/P6P1/2N3P1P/1PP2N3/1RB1tPh2/1R2BH1HQ:
   figcaption.
-    Gauche : avant e5Pf6 (passant le ballon).
-    Droite : après le coup. Ensuite Wxe9# ne peut être empêché.
+    Gauche : avant g2Pe2 (passant le ballon).
+    Droite : après le coup. Ensuite ...Q(x)d1# ne peut être empêché.
 
 p.
-  Les blancs passent la balle du pion e5 vers le gnou en f6.
-  Ensuite, puisque le fou noir ne peut pas bouger la victoire est assurée
-  en le capturant par Wxe9#.
+  Les noirs passent la balle du champion g2 vers la dame en e2.
+  La victoire est alors assurée en jouant ensuite un coup de dame sur la
+  première rangée.
 
 h3 Source
 
diff --git a/client/src/translations/rules/Synchrone/en.pug b/client/src/translations/rules/Synchrone/en.pug
new file mode 100644
index 00000000..74322081
--- /dev/null
+++ b/client/src/translations/rules/Synchrone/en.pug
@@ -0,0 +1,52 @@
+p.boxed
+  | Both players play a move "at the same time".
+  | Conflicts are resolved following a few simple rules.
+
+p.
+  In order to not rethink a big part of the code, the white move has to be
+  played before the black one. However, the black player doesn't see it.
+
+p So both players play "at the same time". Resolving rules:
+ul
+  li.
+    If both moves arrive on the same square, both pieces disappear except
+    if one is a king. In this case only the king remains.
+  li.
+    If a capture was intended but the target moved, the move is still played
+    but doesn't capture anything.
+p.
+  Such captures can be anticipated by capturing our own pieces.
+  If the enemy captures as predicted, his piece disappears.
+  If he doesn't, the self-capture isn't undone.
+
+figure.diagram-container
+  .diagram
+    | fen:rnb1kbnr/ppp1pppp/8/3qP3/8/8/PPPP1PPP/RNBQKBNR:
+  figcaption After 1.e4 d5 2.e5 Qxd5 (anticipating 2.exd5 which isn't played)
+
+h3 End of the game
+
+p.
+  Due to the simultaneity, it is possible that a king is captured for example
+  after escaping a check in a wrong way, as the following diagram shows.
+  So, capturing the king counts as a win, of highest priority.
+  A checkmate wins too, but if your king is captured and the other still on
+  the board (even if it is mated), you lose.
+
+figure.diagram-container
+  .diagram.diag12
+    | fen:r3r1bb/ppqRkppp/8/2p1n3/7n/8/PPPPP1P1/RNBQNBK1:
+  .diagram.diag22
+    | fen:r3r1bb/pp1qRppp/8/2p1n3/7n/8/PPPPP1P1/RNBQNBK1:
+  figcaption.
+    Left: before Rxe7 (white) and Qxd7 (black)
+    Right: after the move (1-0)
+
+h3 Source
+
+p
+  a(href="http://www.hexenspiel.de/engl/synchronous-chess/") Synchronous chess
+  | , modified to allow en-passant captures
+  | and disable the "exchange of captures" stage. 
+  a(href="http://www.pion.ch/echecs/variante.php?jeu=synchro") Another description
+  | &nbsp;(in French).
diff --git a/client/src/translations/rules/Synchrone/es.pug b/client/src/translations/rules/Synchrone/es.pug
new file mode 100644
index 00000000..1a98c95d
--- /dev/null
+++ b/client/src/translations/rules/Synchrone/es.pug
@@ -0,0 +1,53 @@
+p.boxed
+  | Ambos jugadores hacen un movimiento "al mismo tiempo".
+  | Los conflictos se resuelven mediante unas pocas reglas simples.
+
+p.
+  Para no repensar una gran parte del código, el movimiento blanco debe ser
+  jugado antes del movimiento negro. Sin embargo, el jugador negro no lo ve.
+
+p Entonces los dos jugadores juegan "al mismo tiempo". Reglas de resolución:
+ul
+  li.
+    Si las dos jugadas alcanzan la mismo casilla, entonces las dos piezas
+    desaparecerá a menos que uno de ellos sea un rey.
+    En este caso solo queda el rey.
+  li.
+    Si se intenta una captura pero el objetivo se mueve, el movimiento
+    todavía se juega pero no capturó nada.
+p.
+  Tales capturas se pueden anticipar capturando nuestras propias piezas.
+  Si el oponente captura como se esperaba, entonces su pieza desaparece.
+  De lo contrario, la auto-captura no se deshace.
+
+figure.diagram-container
+  .diagram
+    | fen:rnb1kbnr/ppp1pppp/8/3qP3/8/8/PPPP1PPP/RNBQKBNR:
+  figcaption Después de 1.e4 d5 2.e5 Qxd5 (anticipando 2.exd5 que no se juega)
+
+h3 Fin de la partida
+
+p.
+  Debido a la simultaneidad, es posible que un rey sea capturado por
+  ejemplo cubriendo un jaque torpemente, como se muestra
+  el siguiente diagrama.
+  Jaque mate también gana, pero si tu rey es capturado mientras
+  que el otro todavía está en el tablero (incluso si es jaque mate), pierdes.
+
+figure.diagram-container
+  .diagram.diag12
+    | fen:r3r1bb/ppqRkppp/8/2p1n3/7n/8/PPPPP1P1/RNBQNBK1:
+  .diagram.diag22
+    | fen:r3r1bb/pp1qRppp/8/2p1n3/7n/8/PPPPP1P1/RNBQNBK1:
+  figcaption.
+    Izquierda: antes de Rxe7 (blanco) y Qxd7 (negro)
+    Derecha: después del movimiento (1-0)
+
+h3 Fuente
+
+p
+  a(href="http://www.hexenspiel.de/engl/synchronous-chess/") Ajedrez sincrónico
+  | , modificado para autorizar la captura en passant y cancelar la fase de
+  | "cambio de captura". 
+  a(href="http://www.pion.ch/echecs/variante.php?jeu=synchro") Otra descripción
+  | &nbsp;(en francés).
diff --git a/client/src/translations/rules/Synchrone/fr.pug b/client/src/translations/rules/Synchrone/fr.pug
new file mode 100644
index 00000000..1d7fe61d
--- /dev/null
+++ b/client/src/translations/rules/Synchrone/fr.pug
@@ -0,0 +1,53 @@
+p.boxed
+  | Les deux joueurs jouent un coup "en même temps".
+  | Les conflits sont résolus par quelques règles simples.
+
+p.
+  Afin de ne pas repenser une grosse partie du code, le coup blanc doit être
+  joué avant le coup noir. Cependant, le joueur des noirs ne le voit pas.
+
+p Ainsi les deux joueurs jouent "en même temps". Règles de résolution :
+ul
+  li.
+    Si les deux coups arrivent sur la même case, alors les deux pièces
+    disparaissent sauf si l'une des deux est un roi.
+    Dans ce cas seul le roi reste.
+  li.
+    Si une capture est tentée mais que la cible bouge, le coup est tout
+    de même joué mais ne capture rien.
+p.
+  De telles captures peuvent être anticipées en capturant nos propres pièces.
+  Si l'adversaire capture comme prévu, alors sa pièce disparaît.
+  Sinon, l'auto-capture n'est pas défaite.
+
+figure.diagram-container
+  .diagram
+    | fen:rnb1kbnr/ppp1pppp/8/3qP3/8/8/PPPP1PPP/RNBQKBNR:
+  figcaption Après 1.e4 d5 2.e5 Qxd5 (anticipant 2.exd5 qui n'est pas joué)
+
+h3 Fin de la partie
+
+p.
+  À cause de la simultanéité, il est possible qu'un roi soit capturé par
+  exemple en couvrant un échec maladroitement, comme le montre
+  le diagramme suivant.
+  Un échec et mat gagne également, mais si votre roi est capturé tandis
+  que l'autre est encore sur l'échquier (même s'il est maté), vous perdez.
+
+figure.diagram-container
+  .diagram.diag12
+    | fen:r3r1bb/ppqRkppp/8/2p1n3/7n/8/PPPPP1P1/RNBQNBK1:
+  .diagram.diag22
+    | fen:r3r1bb/pp1qRppp/8/2p1n3/7n/8/PPPPP1P1/RNBQNBK1:
+  figcaption.
+    Gauche : avant Rxe7 (blancs) et Qxd7 (noirs)
+    Droite : après le coup (1-0)
+
+h3 Source
+
+p
+  a(href="http://www.hexenspiel.de/engl/synchronous-chess/") Échecs synchronisés
+  | , modifés pour autoriser la prise en passant et annuler la phase
+  | "d'échange de captures". 
+  a(href="http://www.pion.ch/echecs/variante.php?jeu=synchro") Autre description
+  | .
diff --git a/client/src/variants/Ball.js b/client/src/variants/Ball.js
index 5a23e9f8..1bb7731c 100644
--- a/client/src/variants/Ball.js
+++ b/client/src/variants/Ball.js
@@ -1,5 +1,4 @@
 import { ChessRules, Move, PiPo } from "@/base_rules";
-import { WildebeestRules } from "@/variants/Wildebeest";
 import { ArrayFun } from "@/utils/array";
 import { shuffle } from "@/utils/alea";
 
@@ -8,7 +7,7 @@ export class BallRules extends ChessRules {
     return Object.assign(
       {},
       ChessRules.PawnSpecs,
-      { promotions: ChessRules.PawnSpecs.promotions.concat([V.WILDEBEEST]) }
+      { promotions: ChessRules.PawnSpecs.promotions.concat([V.CHAMPION]) }
     );
   }
 
@@ -19,8 +18,8 @@ export class BallRules extends ChessRules {
     return false;
   }
 
-  static get WILDEBEEST() {
-    return 'w';
+  static get CHAMPION() {
+    return 'h';
   }
 
   static get BALL() {
@@ -42,7 +41,7 @@ export class BallRules extends ChessRules {
       'b': 'c',
       'q': 't',
       'k': 'l',
-      'w': 'y'
+      'h': 'd'
     };
   }
 
@@ -54,13 +53,13 @@ export class BallRules extends ChessRules {
       'c': 'b',
       't': 'q',
       'l': 'k',
-      'y': 'w'
+      'd': 'h'
     };
   }
 
   static get PIECES() {
     return ChessRules.PIECES
-      .concat([V.WILDEBEEST])
+      .concat([V.CHAMPION])
       .concat(Object.keys(V.HAS_BALL_DECODE))
       .concat(['a']);
   }
@@ -109,7 +108,7 @@ export class BallRules extends ChessRules {
     let prefix = "";
     const withPrefix =
       Object.keys(V.HAS_BALL_DECODE)
-      .concat([V.WILDEBEEST])
+      .concat([V.CHAMPION])
       .concat(['a']);
     if (withPrefix.includes(b[1])) prefix = "Ball/";
     return prefix + b;
@@ -129,7 +128,7 @@ export class BallRules extends ChessRules {
 
   static GenRandInitFen(randomness) {
     if (randomness == 0)
-      return "rnbqkwnbr/ppppppppp/9/9/4a4/9/9/PPPPPPPPP/RNBQKWNBR w 0 -";
+      return "rnbhqhnbr/ppppppppp/9/9/4a4/9/9/PPPPPPPPP/RNBHQHNBR w 0 -";
 
     let pieces = { w: new Array(9), b: new Array(9) };
     for (let c of ["w", "b"]) {
@@ -140,7 +139,7 @@ export class BallRules extends ChessRules {
 
       // Get random squares for every piece, totally freely
       let positions = shuffle(ArrayFun.range(9));
-      const composition = ['b', 'b', 'r', 'r', 'n', 'n', 'k', 'q', 'w'];
+      const composition = ['b', 'b', 'r', 'r', 'n', 'n', 'h', 'h', 'q'];
       const rem2 = positions[0] % 2;
       if (rem2 == positions[1] % 2) {
         // Fix bishops (on different colors)
@@ -160,7 +159,7 @@ export class BallRules extends ChessRules {
     );
   }
 
-  scanKings(fen) {}
+  scanKings() {}
 
   static get size() {
     return { x: 9, y: 9 };
@@ -174,7 +173,27 @@ export class BallRules extends ChessRules {
   }
 
   static get steps() {
-    return WildebeestRules.steps;
+    return Object.assign(
+      {},
+      ChessRules.steps,
+      // Add champion moves
+      {
+        h: [
+          [-2, -2],
+          [-2, 0],
+          [-2, 2],
+          [0, -2],
+          [0, 2],
+          [2, -2],
+          [2, 0],
+          [2, 2],
+          [-1, 0],
+          [1, 0],
+          [0, -1],
+          [0, 1]
+        ]
+      }
+    );
   }
 
   // Because of the ball, getPiece() could be wrong:
@@ -242,17 +261,33 @@ export class BallRules extends ChessRules {
   // So base implementation is fine.
 
   getPotentialMovesFrom([x, y]) {
-    if (this.getPiece(x, y) == V.WILDEBEEST)
-      return this.getPotentialWildebeestMoves([x, y]);
+    if (this.getPiece(x, y) == V.CHAMPION)
+      return this.getPotentialChampionMoves([x, y]);
     return super.getPotentialMovesFrom([x, y]);
   }
 
-  getPotentialWildebeestMoves(sq) {
-    return this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.KNIGHT].concat(V.steps[WildebeestRules.CAMEL]),
-      "oneStep"
-    );
+  // "Sliders": at most 2 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 == 2) 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;
+  }
+
+  getPotentialChampionMoves(sq) {
+    return this.getSlideNJumpMoves(sq, V.steps[V.CHAMPION], "oneStep");
   }
 
   filterValid(moves) {
@@ -292,8 +327,7 @@ export class BallRules extends ChessRules {
       n: 3,
       b: 3,
       q: 9,
-      w: 7,
-      k: 5,
+      h: 4,
       a: 0 //ball: neutral
     };
   }
diff --git a/client/src/variants/Eightpieces.js b/client/src/variants/Eightpieces.js
index 42df93e3..fa80824b 100644
--- a/client/src/variants/Eightpieces.js
+++ b/client/src/variants/Eightpieces.js
@@ -146,7 +146,7 @@ export class EightpiecesRules extends ChessRules {
   static GenRandInitFen(randomness) {
     if (randomness == 0)
       // Deterministic:
-      return "jsfqkbnr/pppppppp/8/8/8/8/PPPPPPPP/JSDQKBNR w 0 ahah - -";
+      return "jfsqkbnr/pppppppp/8/8/8/8/PPPPPPPP/JDSQKBNR w 0 ahah - -";
 
     let pieces = { w: new Array(8), b: new Array(8) };
     let flags = "";
@@ -657,106 +657,6 @@ export class EightpiecesRules extends ChessRules {
     return this.filterValid(this.getPotentialMovesFrom(sentrySq));
   }
 
-  prePlay(move) {
-    if (move.appear.length == 0 && move.vanish.length == 1)
-      // The sentry is about to push a piece: subTurn goes from 1 to 2
-      this.sentryPos = { x: move.end.x, y: move.end.y };
-    if (this.subTurn == 2 && move.vanish[0].p != V.PAWN) {
-      // A piece is pushed: forbid array of squares between start and end
-      // of move, included (except if it's a pawn)
-      let squares = [];
-      if ([V.KNIGHT,V.KING].includes(move.vanish[0].p))
-        // short-range pieces: just forbid initial square
-        squares.push({ x: move.start.x, y: move.start.y });
-      else {
-        const deltaX = move.end.x - move.start.x;
-        const deltaY = move.end.y - move.start.y;
-        const step = [
-          deltaX / Math.abs(deltaX) || 0,
-          deltaY / Math.abs(deltaY) || 0
-        ];
-        for (
-          let sq = {x: move.start.x, y: move.start.y};
-          sq.x != move.end.x || sq.y != move.end.y;
-          sq.x += step[0], sq.y += step[1]
-        ) {
-          squares.push({ x: sq.x, y: sq.y });
-        }
-      }
-      // Add end square as well, to know if I was pushed (useful for lancers)
-      squares.push({ x: move.end.x, y: move.end.y });
-      this.sentryPush.push(squares);
-    } else this.sentryPush.push(null);
-  }
-
-  play(move) {
-    this.prePlay(move);
-    move.flags = JSON.stringify(this.aggregateFlags());
-    this.epSquares.push(this.getEpSquare(move));
-    V.PlayOnBoard(this.board, move);
-    // Is it a sentry push? (useful for undo)
-    move.sentryPush = (this.subTurn == 2);
-    if (this.subTurn == 1) this.movesCount++;
-    if (move.appear.length == 0 && move.vanish.length == 1) this.subTurn = 2;
-    else {
-      // Turn changes only if not a sentry "pre-push"
-      this.turn = V.GetOppCol(this.turn);
-      this.subTurn = 1;
-    }
-    this.postPlay(move);
-  }
-
-  postPlay(move) {
-    if (move.vanish.length == 0 || this.subTurn == 2)
-      // Special pass move of the king, or sentry pre-push: nothing to update
-      return;
-    const c = move.vanish[0].c;
-    const piece = move.vanish[0].p;
-    const firstRank = c == "w" ? V.size.x - 1 : 0;
-
-    if (piece == V.KING) {
-      this.kingPos[c][0] = move.appear[0].x;
-      this.kingPos[c][1] = move.appear[0].y;
-      this.castleFlags[c] = [V.size.y, V.size.y];
-      return;
-    }
-    // Update castling flags if rooks are moved
-    const oppCol = V.GetOppCol(c);
-    const oppFirstRank = V.size.x - 1 - firstRank;
-    if (
-      move.start.x == firstRank && //our rook moves?
-      this.castleFlags[c].includes(move.start.y)
-    ) {
-      const flagIdx = (move.start.y == this.castleFlags[c][0] ? 0 : 1);
-      this.castleFlags[c][flagIdx] = V.size.y;
-    } else if (
-      move.end.x == oppFirstRank && //we took opponent rook?
-      this.castleFlags[oppCol].includes(move.end.y)
-    ) {
-      const flagIdx = (move.end.y == this.castleFlags[oppCol][0] ? 0 : 1);
-      this.castleFlags[oppCol][flagIdx] = V.size.y;
-    }
-  }
-
-  undo(move) {
-    this.epSquares.pop();
-    this.disaggregateFlags(JSON.parse(move.flags));
-    V.UndoOnBoard(this.board, move);
-    // Decrement movesCount except if the move is a sentry push
-    if (!move.sentryPush) this.movesCount--;
-    if (this.subTurn == 2) this.subTurn = 1;
-    else {
-      this.turn = V.GetOppCol(this.turn);
-      if (move.sentryPush) this.subTurn = 2;
-    }
-    this.postUndo(move);
-  }
-
-  postUndo(move) {
-    super.postUndo(move);
-    this.sentryPush.pop();
-  }
-
   isAttacked(sq, color) {
     return (
       super.isAttacked(sq, color) ||
@@ -937,6 +837,106 @@ export class EightpiecesRules extends ChessRules {
 
   // Jailer doesn't capture or give check
 
+  prePlay(move) {
+    if (move.appear.length == 0 && move.vanish.length == 1)
+      // The sentry is about to push a piece: subTurn goes from 1 to 2
+      this.sentryPos = { x: move.end.x, y: move.end.y };
+    if (this.subTurn == 2 && move.vanish[0].p != V.PAWN) {
+      // A piece is pushed: forbid array of squares between start and end
+      // of move, included (except if it's a pawn)
+      let squares = [];
+      if ([V.KNIGHT,V.KING].includes(move.vanish[0].p))
+        // short-range pieces: just forbid initial square
+        squares.push({ x: move.start.x, y: move.start.y });
+      else {
+        const deltaX = move.end.x - move.start.x;
+        const deltaY = move.end.y - move.start.y;
+        const step = [
+          deltaX / Math.abs(deltaX) || 0,
+          deltaY / Math.abs(deltaY) || 0
+        ];
+        for (
+          let sq = {x: move.start.x, y: move.start.y};
+          sq.x != move.end.x || sq.y != move.end.y;
+          sq.x += step[0], sq.y += step[1]
+        ) {
+          squares.push({ x: sq.x, y: sq.y });
+        }
+      }
+      // Add end square as well, to know if I was pushed (useful for lancers)
+      squares.push({ x: move.end.x, y: move.end.y });
+      this.sentryPush.push(squares);
+    } else this.sentryPush.push(null);
+  }
+
+  play(move) {
+    this.prePlay(move);
+    move.flags = JSON.stringify(this.aggregateFlags());
+    this.epSquares.push(this.getEpSquare(move));
+    V.PlayOnBoard(this.board, move);
+    // Is it a sentry push? (useful for undo)
+    move.sentryPush = (this.subTurn == 2);
+    if (this.subTurn == 1) this.movesCount++;
+    if (move.appear.length == 0 && move.vanish.length == 1) this.subTurn = 2;
+    else {
+      // Turn changes only if not a sentry "pre-push"
+      this.turn = V.GetOppCol(this.turn);
+      this.subTurn = 1;
+    }
+    this.postPlay(move);
+  }
+
+  postPlay(move) {
+    if (move.vanish.length == 0 || this.subTurn == 2)
+      // Special pass move of the king, or sentry pre-push: nothing to update
+      return;
+    const c = move.vanish[0].c;
+    const piece = move.vanish[0].p;
+    const firstRank = c == "w" ? V.size.x - 1 : 0;
+
+    if (piece == V.KING) {
+      this.kingPos[c][0] = move.appear[0].x;
+      this.kingPos[c][1] = move.appear[0].y;
+      this.castleFlags[c] = [V.size.y, V.size.y];
+      return;
+    }
+    // Update castling flags if rooks are moved
+    const oppCol = V.GetOppCol(c);
+    const oppFirstRank = V.size.x - 1 - firstRank;
+    if (
+      move.start.x == firstRank && //our rook moves?
+      this.castleFlags[c].includes(move.start.y)
+    ) {
+      const flagIdx = (move.start.y == this.castleFlags[c][0] ? 0 : 1);
+      this.castleFlags[c][flagIdx] = V.size.y;
+    } else if (
+      move.end.x == oppFirstRank && //we took opponent rook?
+      this.castleFlags[oppCol].includes(move.end.y)
+    ) {
+      const flagIdx = (move.end.y == this.castleFlags[oppCol][0] ? 0 : 1);
+      this.castleFlags[oppCol][flagIdx] = V.size.y;
+    }
+  }
+
+  undo(move) {
+    this.epSquares.pop();
+    this.disaggregateFlags(JSON.parse(move.flags));
+    V.UndoOnBoard(this.board, move);
+    // Decrement movesCount except if the move is a sentry push
+    if (!move.sentryPush) this.movesCount--;
+    if (this.subTurn == 2) this.subTurn = 1;
+    else {
+      this.turn = V.GetOppCol(this.turn);
+      if (move.sentryPush) this.subTurn = 2;
+    }
+    this.postUndo(move);
+  }
+
+  postUndo(move) {
+    super.postUndo(move);
+    this.sentryPush.pop();
+  }
+
   static get VALUES() {
     return Object.assign(
       { l: 4.8, s: 2.8, j: 3.8 }, //Jeff K. estimations
diff --git a/client/src/variants/Synchrone.js b/client/src/variants/Synchrone.js
index e47941bf..372bc1ee 100644
--- a/client/src/variants/Synchrone.js
+++ b/client/src/variants/Synchrone.js
@@ -1,11 +1,468 @@
+// TODO: debug, and forbid self-capture of king.
+
 import { ChessRules } from "@/base_rules";
+import { randInt } from "@/utils/alea";
 
 export class SynchroneRules extends ChessRules {
-  // TODO: getNotation retourne "?" si turn == "w"
-  // ==> byrows disparait, juste "showAll" et "None".
-  //
-  // play: si turn == "w", enregistrer le coup (whiteMove),
-  // mais ne rien faire ==> résolution après le coup noir.
-  //
-  // ==> un coup sur deux (coups blancs) est "vide" du point de vue de l'exécution.
+  static get CanAnalyze() {
+    return true; //false;
+  }
+
+  static get ShowMoves() {
+    return "byrow";
+  }
+
+  static IsGoodFen(fen) {
+    if (!ChessRules.IsGoodFen(fen)) return false;
+    const fenParsed = V.ParseFen(fen);
+    // 5) Check whiteMove
+    if (
+      (
+        fenParsed.turn == "w" &&
+        // NOTE: do not check really JSON stringified move...
+        (!fenParsed.whiteMove || fenParsed.whiteMove == "-")
+      )
+      ||
+      (fenParsed.turn == "b" && fenParsed.whiteMove != "-")
+    ) {
+      return false;
+    }
+    return true;
+  }
+
+  static IsGoodEnpassant(enpassant) {
+    const epArray = enpassant.split(",");
+    if (![2, 3].includes(epArray.length)) return false;
+    epArray.forEach(epsq => {
+      if (epsq != "-") {
+        const ep = V.SquareToCoords(epsq);
+        if (isNaN(ep.x) || !V.OnBoard(ep)) return false;
+      }
+    });
+    return true;
+  }
+
+  static ParseFen(fen) {
+    const fenParts = fen.split(" ");
+    return Object.assign(
+      ChessRules.ParseFen(fen),
+      { whiteMove: fenParts[5] }
+    );
+  }
+
+  static GenRandInitFen(randomness) {
+    return ChessRules.GenRandInitFen(randomness).slice(0, -1) + "-,- -";
+  }
+
+  getFen() {
+    return super.getFen() + " " + this.getWhitemoveFen();
+  }
+
+  getFenForRepeat() {
+    return super.getFenForRepeat() + "_" + this.getWhitemoveFen();
+  }
+
+  setOtherVariables(fen) {
+    const parsedFen = V.ParseFen(fen);
+    this.setFlags(parsedFen.flags);
+    const epArray = parsedFen.enpassant.split(",");
+    this.epSquares = [];
+    epArray.forEach(epsq => this.epSquares.push(this.getEpSquare(epsq)));
+    super.scanKings(fen);
+    // Also init whiteMove
+    this.whiteMove =
+      parsedFen.whiteMove != "-"
+        ? JSON.parse(parsedFen.whiteMove)
+        : null;
+  }
+
+  // After undo(): no need to re-set INIT_COL_KING
+  scanKings() {
+    this.kingPos = { w: [-1, -1], b: [-1, -1] };
+    for (let i = 0; i < V.size.x; i++) {
+      for (let j = 0; j < V.size.y; j++) {
+        if (this.getPiece(i, j) == V.KING)
+          this.kingPos[this.getColor(i, j)] = [i, j];
+      }
+    }
+  }
+
+  getEnpassantFen() {
+    const L = this.epSquares.length;
+    let res = "";
+    const start = L - 2 - (this.turn == 'b' ? 1 : 0);
+    for (let i=start; i < L; i++) {
+      if (!this.epSquares[i]) res += "-,";
+      else res += V.CoordsToSquare(this.epSquares[i]) + ",";
+    }
+    return res.slice(0, -1);
+  }
+
+  getWhitemoveFen() {
+    if (!this.whiteMove) return "-";
+    return JSON.stringify({
+      start: this.whiteMove.start,
+      end: this.whiteMove.end,
+      appear: this.whiteMove.appear,
+      vanish: this.whiteMove.vanish
+    });
+  }
+
+  // NOTE: lazy unefficient implementation (for now. TODO?)
+  getPossibleMovesFrom([x, y]) {
+    const moves = this.getAllValidMoves();
+    return moves.filter(m => {
+      return m.start.x == x && m.start.y == y;
+    });
+  }
+
+  getCaptures(x, y) {
+    const color = this.turn;
+    const sliderAttack = (xx, yy, allowedSteps) => {
+      const deltaX = xx - x,
+            absDeltaX = Math.abs(deltaX);
+      const deltaY = yy - y,
+            absDeltaY = Math.abs(deltaY);
+      const step = [ deltaX / absDeltaX || 0, deltaY / absDeltaY || 0 ];
+      if (
+        // Check that the step is a priori valid:
+        (absDeltaX != absDeltaY && deltaX != 0 && deltaY != 0) ||
+        allowedSteps.every(st => st[0] != step[0] || st[1] != step[1])
+      ) {
+        return null;
+      }
+      let sq = [ x + step[0], y + step[1] ];
+      while (sq[0] != xx || sq[1] != yy) {
+        // NOTE: no need to check OnBoard in this special case
+        if (this.board[sq[0]][sq[1]] != V.EMPTY) return null;
+        sq[0] += step[0];
+        sq[1] += step[1];
+      }
+      return this.getBasicMove([xx, yy], [x, y]);
+    };
+    // Can I take on the square [x, y] ?
+    // If yes, return the (list of) capturing move(s)
+    let moves = [];
+    for (let i=0; i<8; i++) {
+      for (let j=0; j<8; j++) {
+        if (this.getColor(i, j) == color) {
+          switch (this.getPiece(i, j)) {
+            case V.PAWN: {
+              // Pushed pawns move as enemy pawns
+              const shift = (color == 'w' ? 1 : -1);
+              if (x + shift == i && Math.abs(y - j) == 1)
+                moves.push(this.getBasicMove([i, j], [x, y]));
+              break;
+            }
+            case V.KNIGHT: {
+              const deltaX = Math.abs(i - x);
+              const deltaY = Math.abs(j - y);
+              if (
+                deltaX + deltaY == 3 &&
+                [1, 2].includes(deltaX) &&
+                [1, 2].includes(deltaY)
+              ) {
+                moves.push(this.getBasicMove([i, j], [x, y]));
+              }
+              break;
+            }
+            case V.KING:
+              if (Math.abs(i - x) <= 1 && Math.abs(j - y) <= 1)
+                moves.push(this.getBasicMove([i, j], [x, y]));
+              break;
+            case V.ROOK: {
+              const mv = sliderAttack(i, j, V.steps[V.ROOK]);
+              if (!!mv) moves.push(mv);
+              break;
+            }
+            case V.BISHOP: {
+              const mv = sliderAttack(i, j, V.steps[V.BISHOP]);
+              if (!!mv) moves.push(mv);
+              break;
+            }
+            case V.QUEEN: {
+              const mv = sliderAttack(
+                i, j, V.steps[V.ROOK].concat(V.steps[V.BISHOP]));
+              if (!!mv) moves.push(mv);
+              break;
+            }
+          }
+        }
+      }
+    }
+    return this.filterValid(moves);
+  }
+
+  getAllValidMoves() {
+    const color = this.turn;
+    // 0) Generate our possible moves
+    let myMoves = super.getAllValidMoves();
+    // Lookup table to quickly decide if a move is already in list:
+    let moveSet = {};
+    const getMoveHash = (move) => {
+      return (
+        "m" + move.start.x + move.start.y +
+              move.end.x + move.end.y +
+              // Also use m.appear[0].p for pawn promotions
+              move.appear[0].p
+      );
+    };
+    myMoves.forEach(m => moveSet[getMoveHash(m)] = true);
+    // 1) Generate all opponent's moves
+    this.turn = V.GetOppCol(color);
+    const oppMoves = super.getAllValidMoves();
+    this.turn = color;
+    // 2) Play each opponent's move, and see if captures are possible:
+    // --> capturing moving unit only (otherwise some issues)
+    oppMoves.forEach(m => {
+      V.PlayOnBoard(this.board, m);
+      // Can I take on [m.end.x, m.end.y] ?
+      // If yes and not already in list, add it (without the capturing part)
+      let capturingMoves = this.getCaptures(m.end.x, m.end.y);
+      capturingMoves.forEach(cm => {
+        const cmHash = getMoveHash(cm);
+        if (!moveSet[cmHash]) {
+          // The captured unit hasn't moved yet, so temporarily cancel capture
+          cm.vanish.pop();
+          // If m is itself a capturing move: then replace by self-capture
+          if (m.vanish.length == 2) cm.vanish.push(m.vanish[1]);
+          myMoves.push(cm);
+          moveSet[cmHash] = true;
+        }
+      });
+      V.UndoOnBoard(this.board, m);
+    });
+    return myMoves;
+  }
+
+  filterValid(moves) {
+    if (moves.length == 0) return [];
+    // filterValid can be called when it's "not our turn":
+    const color = moves[0].vanish[0].c;
+    return moves.filter(m => {
+      const piece = m.vanish[0].p;
+      if (piece == V.KING) {
+        this.kingPos[color][0] = m.appear[0].x;
+        this.kingPos[color][1] = m.appear[0].y;
+      }
+      V.PlayOnBoard(this.board, m);
+      let res = !this.underCheck(color);
+      V.UndoOnBoard(this.board, m);
+      if (piece == V.KING) this.kingPos[color] = [m.start.x, m.start.y];
+      return res;
+    });
+  }
+
+  atLeastOneMove(color) {
+    const curTurn = this.turn;
+    this.turn = color;
+    const res = super.atLeastOneMove();
+    this.turn = curTurn;
+    return res;
+  }
+
+  // White and black (partial) moves were played: merge
+  resolveSynchroneMove(move) {
+    const m1 = this.whiteMove;
+    const m2 = move;
+    // For PlayOnBoard (no need for start / end, irrelevant)
+    let smove = {
+      appear: [],
+      vanish: [
+        m1.vanish[0],
+        m2.vanish[0]
+      ]
+    };
+    if ((m1.end.x != m2.end.x) || (m1.end.y != m2.end.y)) {
+      // Easy case: two independant moves (which may (self-)capture)
+      smove.appear.push(m1.appear[0]);
+      smove.appear.push(m2.appear[0]);
+      // "Captured" pieces may have moved:
+      if (
+        m1.vanish.length == 2 &&
+        (
+          m2.end.x != m1.vanish[1].x ||
+          m2.end.y != m1.vanish[1].y
+        )
+      ) {
+        smove.vanish.push(m1.vanish[1]);
+      }
+      if (
+        m2.vanish.length == 2 &&
+        (
+          m1.end.x != m2.vanish[1].x ||
+          m1.end.y != m2.vanish[1].y
+        )
+      ) {
+        smove.vanish.push(m2.vanish[1]);
+      }
+    } else {
+      // Collision:
+      if (m1.vanish.length == 1 && m2.vanish.length == 1) {
+        // Easy case: both disappear except if one is a king
+        const p1 = m1.vanish[0].p;
+        const p2 = m2.vanish[0].p;
+        if ([p1, p2].includes(V.KING)) {
+          smove.appear.push({
+            x: m1.end.x,
+            y: m1.end.y,
+            p: V.KING,
+            c: (p1 == V.KING ? 'w' : 'b')
+          });
+        }
+      } else {
+        // One move is a self-capture and the other a normal capture:
+        // only the self-capture appears
+        console.log(m1);
+        console.log(m2);
+        const selfCaptureMove =
+          m1.vanish[1].c == m1.vanish[0].c
+            ? m1
+            : m2;
+        smove.appear.push({
+          x: m1.end.x,
+          y: m1.end.y,
+          p: selfCaptureMove.appear[0].p,
+          c: selfCaptureMove.vanish[0].c
+        });
+      }
+    }
+    return smove;
+  }
+
+  play(move) {
+    move.flags = JSON.stringify(this.aggregateFlags()); //save flags (for undo)
+    this.epSquares.push(this.getEpSquare(move));
+    // Do not play on board (would reveal the move...)
+    this.turn = V.GetOppCol(this.turn);
+    this.movesCount++;
+    this.postPlay(move);
+  }
+
+  updateCastleFlags(move) {
+    const firstRank = { 'w': V.size.x - 1, 'b': 0 };
+    move.appear.concat(move.vanish).forEach(av => {
+      for (let c of ['w', 'b']) {
+        if (av.x == firstRank[c] && this.castleFlags[c].includes(av.y)) {
+          const flagIdx = (av.y == this.castleFlags[c][0] ? 0 : 1);
+          this.castleFlags[c][flagIdx] = 8;
+        }
+      }
+    });
+  }
+
+  postPlay(move) {
+    if (this.turn == 'b') {
+      // NOTE: whiteMove is used read-only, so no need to copy
+      this.whiteMove = move;
+      return;
+    }
+
+    // A full turn just ended:
+    const smove = this.resolveSynchroneMove(move);
+    V.PlayOnBoard(this.board, smove);
+    this.whiteMove = null;
+
+    // Update king position + flags
+    let kingAppear = { 'w': false, 'b': false };
+    for (let i=0; i<smove.appear.length; i++) {
+      if (smove.appear[i].p == V.KING) {
+        const c = smove.appear[i].c;
+        kingAppear[c] = true;
+        this.kingPos[c][0] = smove.appear[i].x;
+        this.kingPos[c][1] = smove.appear[i].y;
+      }
+    }
+    for (let i=0; i<smove.vanish.length; i++) {
+      if (smove.vanish[i].p == V.KING) {
+        const c = smove.vanish[i].c;
+        if (!kingAppear[c]) {
+          this.kingPos[c][0] = -1;
+          this.kingPos[c][1] = -1;
+        }
+        break;
+      }
+    }
+    this.updateCastleFlags(smove);
+    move.smove = smove;
+  }
+
+  undo(move) {
+    this.epSquares.pop();
+    this.disaggregateFlags(JSON.parse(move.flags));
+    if (this.turn == 'w')
+      // Back to the middle of the move
+      V.UndoOnBoard(this.board, move.smove);
+    this.turn = V.GetOppCol(this.turn);
+    this.movesCount--;
+    this.postUndo(move);
+  }
+
+  postUndo(move) {
+    if (this.turn == 'w')
+      // Reset king positions: scan board
+      this.scanKings();
+  }
+
+  getCheckSquares(color) {
+    if (color == 'b') return [];
+    let res = [];
+    if (this.underCheck('w'))
+      res.push(JSON.parse(JSON.stringify(this.kingPos['w'])));
+    if (this.underCheck('b'))
+      res.push(JSON.parse(JSON.stringify(this.kingPos['b'])));
+    return res;
+  }
+
+  getCurrentScore() {
+    if (this.turn == 'b')
+      // Turn (white + black) not over yet
+      return "*";
+    // Was a king captured?
+    if (this.kingPos['w'][0] < 0) return "0-1";
+    if (this.kingPos['b'][0] < 0) return "1-0";
+    const whiteCanMove = this.atLeastOneMove('w');
+    const blackCanMove = this.atLeastOneMove('b');
+    if (whiteCanMove && blackCanMove) return "*";
+    // Game over
+    const whiteInCheck = this.underCheck('w');
+    const blackInCheck = this.underCheck('b');
+    if (
+      (whiteCanMove && !this.underCheck('b')) ||
+      (blackCanMove && !this.underCheck('w'))
+    ) {
+      return "1/2";
+    }
+    // Checkmate: could be mutual
+    if (!whiteCanMove && !blackCanMove) return "1/2";
+    return (whiteCanMove ? "1-0" : "0-1");
+  }
+
+  getComputerMove() {
+    const maxeval = V.INFINITY;
+    const color = this.turn;
+    let moves = this.getAllValidMoves();
+    if (moves.length == 0)
+      // TODO: this situation should not happen
+      return null;
+
+    if (Math.random() < 0.5)
+      // Return a random move
+      return moves[randInt(moves.length)];
+
+    // Rank moves at depth 1:
+    // try to capture something (not re-capturing)
+    moves.forEach(m => {
+      V.PlayOnBoard(this.board, m);
+      m.eval = this.evalPosition();
+      V.UndoOnBoard(this.board, m);
+    });
+    moves.sort((a, b) => {
+      return (color == "w" ? 1 : -1) * (b.eval - a.eval);
+    });
+    let candidates = [0];
+    for (let i = 1; i < moves.length && moves[i].eval == moves[0].eval; i++)
+      candidates.push(i);
+    return moves[candidates[randInt(candidates.length)]];
+  }
 };
diff --git a/client/src/variants/Twokings.js b/client/src/variants/Twokings.js
index ce30d653..68910e74 100644
--- a/client/src/variants/Twokings.js
+++ b/client/src/variants/Twokings.js
@@ -34,7 +34,7 @@ export class TwokingsRules extends CoregalRules {
   }
 
   // Not scanning king positions. In this variant, scan the board everytime.
-  scanKings(fen) {}
+  scanKings() {}
 
   getCheckSquares(color) {
     let squares = [];
diff --git a/client/src/views/Analyse.vue b/client/src/views/Analyse.vue
index 484b8046..557a2df7 100644
--- a/client/src/views/Analyse.vue
+++ b/client/src/views/Analyse.vue
@@ -96,7 +96,7 @@ export default {
     },
     adjustFenSize: function() {
       let fenInput = document.getElementById("fen");
-      fenInput.style.width = (this.curFen.length+1) + "ch";
+      fenInput.style.width = (this.curFen.length+3) + "ch";
     },
     tryGotoFen: function() {
       if (V.IsGoodFen(this.curFen)) {
@@ -107,3 +107,9 @@ export default {
   }
 };
 </script>
+
+<style lang="sass" scoped=true>
+input#fen
+  // Use a Monospace font for input FEN width adjustment
+  font-family: "Fira Code"
+</style>