From 305ede7ec3753fc669b7c86af5b5c5b2fc78a164 Mon Sep 17 00:00:00 2001
From: Benjamin Auder <benjamin.auder@somewhere>
Date: Sun, 22 Mar 2020 04:10:46 +0100
Subject: [PATCH] First draft of S-chess variant + a few fixes

---
 TODO                                        |   2 -
 client/public/images/pieces/Schess/be.svg   | 177 +++++++++++
 client/public/images/pieces/Schess/bh.svg   | 118 ++++++++
 client/public/images/pieces/Schess/we.svg   | 201 +++++++++++++
 client/public/images/pieces/Schess/wh.svg   | 157 ++++++++++
 client/src/base_rules.js                    |   8 +-
 client/src/translations/en.js               |   1 +
 client/src/translations/es.js               |   1 +
 client/src/translations/fr.js               |   1 +
 client/src/translations/rules/Ball/en.pug   |   4 +-
 client/src/translations/rules/Ball/es.pug   |   4 +-
 client/src/translations/rules/Ball/fr.pug   |   4 +-
 client/src/translations/rules/Schess/en.pug |  40 +++
 client/src/translations/rules/Schess/es.pug |  42 +++
 client/src/translations/rules/Schess/fr.pug |  41 +++
 client/src/variants/Ball.js                 |   2 +-
 client/src/variants/Cannibal.js             |  15 +
 client/src/variants/Checkered.js            |  18 +-
 client/src/variants/Schess.js               | 308 ++++++++++++++++++++
 client/src/variants/Twokings.js             |  46 ++-
 client/src/views/Hall.vue                   |   1 +
 server/db/populate.sql                      |   1 +
 22 files changed, 1169 insertions(+), 23 deletions(-)
 create mode 100644 client/public/images/pieces/Schess/be.svg
 create mode 100644 client/public/images/pieces/Schess/bh.svg
 create mode 100644 client/public/images/pieces/Schess/we.svg
 create mode 100644 client/public/images/pieces/Schess/wh.svg
 create mode 100644 client/src/translations/rules/Schess/en.pug
 create mode 100644 client/src/translations/rules/Schess/es.pug
 create mode 100644 client/src/translations/rules/Schess/fr.pug
 create mode 100644 client/src/variants/Schess.js

diff --git a/TODO b/TODO
index 4a638435..1a566ad6 100644
--- a/TODO
+++ b/TODO
@@ -2,8 +2,6 @@
 Landing pieces from empty board:
 https://www.chessvariants.com/diffsetup.dir/unachess.html
 
-S-chess https://en.wikipedia.org/wiki/Seirawan_chess
-
 Generator variant, called "Matrix" ?
 Peces on first rank never move but generate new pieces. Pawn don't generate.
 A generator captured and replaced by a similar piece does not generate.
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new file mode 100644
index 00000000..5868980b
--- /dev/null
+++ b/client/public/images/pieces/Schess/be.svg
@@ -0,0 +1,177 @@
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diff --git a/client/public/images/pieces/Schess/bh.svg b/client/public/images/pieces/Schess/bh.svg
new file mode 100644
index 00000000..da180149
--- /dev/null
+++ b/client/public/images/pieces/Schess/bh.svg
@@ -0,0 +1,118 @@
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diff --git a/client/public/images/pieces/Schess/we.svg b/client/public/images/pieces/Schess/we.svg
new file mode 100644
index 00000000..05f8ffa8
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diff --git a/client/public/images/pieces/Schess/wh.svg b/client/public/images/pieces/Schess/wh.svg
new file mode 100644
index 00000000..2b8b5e55
--- /dev/null
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@@ -0,0 +1,157 @@
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diff --git a/client/src/base_rules.js b/client/src/base_rules.js
index f51e8d01..52ec2c54 100644
--- a/client/src/base_rules.js
+++ b/client/src/base_rules.js
@@ -191,9 +191,9 @@ export const ChessRules = class ChessRules {
     return V.CoordToColumn(coords.y) + (V.size.x - coords.x);
   }
 
-  // Path to pieces
+  // Path to pieces (standard ones in pieces/ folder)
   getPpath(b) {
-    return b; //usual pieces in pieces/ folder
+    return b;
   }
 
   // Path to promotion pieces (usually the same)
@@ -1101,7 +1101,9 @@ export const ChessRules = class ChessRules {
     ) {
       const flagIdx = (move.start.y == this.castleFlags[c][0] ? 0 : 1);
       this.castleFlags[c][flagIdx] = V.size.y;
-    } else if (
+    }
+    // NOTE: not "else if" because a rook could take an opposing rook
+    if (
       move.end.x == oppFirstRank && //we took opponent rook?
       this.castleFlags[oppCol].includes(move.end.y)
     ) {
diff --git a/client/src/translations/en.js b/client/src/translations/en.js
index 90d7daf5..f5139ce9 100644
--- a/client/src/translations/en.js
+++ b/client/src/translations/en.js
@@ -193,6 +193,7 @@ export const translations = {
   "Reverse captures": "Reverse captures",
   "Run forward": "Run forward",
   "Score a goal": "Score a goal",
+  "Seirawan-Harper Chess": "Seirawan-Harper Chess",
   "Shared pieces": "Shared pieces",
   "Shoot pieces": "Shoot pieces",
   "Squares disappear": "Squares disappear",
diff --git a/client/src/translations/es.js b/client/src/translations/es.js
index 6894fcab..57e85b70 100644
--- a/client/src/translations/es.js
+++ b/client/src/translations/es.js
@@ -193,6 +193,7 @@ export const translations = {
   "Reverse captures": "Capturas invertidas",
   "Run forward": "Correr hacia adelante",
   "Score a goal": "Marcar una meta",
+  "Seirawan-Harper Chess": "Ajedrez Seirawan-Harper",
   "Shared pieces": "Piezas compartidas",
   "Shoot pieces": "Tirar de las piezas",
   "Squares disappear": "Las casillas desaparecen",
diff --git a/client/src/translations/fr.js b/client/src/translations/fr.js
index 02b168de..dc3329db 100644
--- a/client/src/translations/fr.js
+++ b/client/src/translations/fr.js
@@ -193,6 +193,7 @@ export const translations = {
   "Reverse captures": "Captures inversées",
   "Run forward": "Courir vers l'avant",
   "Score a goal": "Marquer un but",
+  "Seirawan-Harper Chess": "Échecs Seirawan-Harper",
   "Shared pieces": "Pièces partagées",
   "Shoot pieces": "Tirez sur les pièces",
   "Squares disappear": "Les cases disparaissent",
diff --git a/client/src/translations/rules/Ball/en.pug b/client/src/translations/rules/Ball/en.pug
index 475a1609..49005d8a 100644
--- a/client/src/translations/rules/Ball/en.pug
+++ b/client/src/translations/rules/Ball/en.pug
@@ -14,9 +14,9 @@ ul
 
 figure.diagram-container
   .diagram.diag12
-    | fen:rnbqkwbnr/ppppp1ppp/9/5p3/4a4/9/2N3N2/PPPPPPPPP/R1BQKWB1R:
+    | fen:rnbqkwnbr/ppppp1ppp/9/5p3/4a4/9/2N4N1/PPPPPPPPP/R1BQKW1BR:
   .diagram.diag22
-    | fen:rnbqkwbnr/ppppp1ppp/9/9/4s4/9/2N3N2/PPPPPPPPP/R1BQKWB1R:
+    | fen:rnbqkwnbr/ppppp1ppp/9/9/4s4/9/2N4N1/PPPPPPPPP/R1BQKW1BR:
   figcaption Left: before ...fxe5 (taking ball). Right: after ...fxe5.
 
 p.
diff --git a/client/src/translations/rules/Ball/es.pug b/client/src/translations/rules/Ball/es.pug
index 68940c7f..42922c47 100644
--- a/client/src/translations/rules/Ball/es.pug
+++ b/client/src/translations/rules/Ball/es.pug
@@ -14,9 +14,9 @@ ul
 
 figure.diagram-container
   .diagram.diag12
-    | fen:rnbqkwbnr/ppppp1ppp/9/5p3/4a4/9/2N3N2/PPPPPPPPPP/R1BQKWB1R:
+    | fen:rnbqkwnbr/ppppp1ppp/9/5p3/4a4/9/2N4N1/PPPPPPPPPP/R1BQKW1BR:
   .diagram.diag22
-    | fen:rnbqkwbnr/ppppp1ppp/9/9/4s4/9/2N3N2/PPPPPPPPPP/R1BQKWB1R:
+    | fen:rnbqkwnbr/ppppp1ppp/9/9/4s4/9/2N4N1/PPPPPPPPPP/R1BQKW1BR:
   figcaption.
     Izquierda: antes de ...fxe5 (tomando la pelota).
     Derecha: después de ...fxe5.
diff --git a/client/src/translations/rules/Ball/fr.pug b/client/src/translations/rules/Ball/fr.pug
index 9fae0806..070021d2 100644
--- a/client/src/translations/rules/Ball/fr.pug
+++ b/client/src/translations/rules/Ball/fr.pug
@@ -14,9 +14,9 @@ ul
 
 figure.diagram-container
   .diagram.diag12
-    | fen:rnbqkwbnr/ppppp1ppp/9/5p3/4a4/9/2N3N2/PPPPPPPPP/R1BQKWB1R:
+    | fen:rnbqkwnbr/ppppp1ppp/9/5p3/4a4/9/2N4N1/PPPPPPPPP/R1BQKW1BR:
   .diagram.diag22
-    | fen:rnbqkwbnr/ppppp1ppp/9/9/4s4/9/2N3N2/PPPPPPPPP/R1BQKWB1R:
+    | fen:rnbqkwnbr/ppppp1ppp/9/9/4s4/9/2N4N1/PPPPPPPPP/R1BQKW1BR:
   figcaption Gauche : avant ...fxe5 (prenant le ballon). Droite : après ...fxe5.
 
 p.
diff --git a/client/src/translations/rules/Schess/en.pug b/client/src/translations/rules/Schess/en.pug
new file mode 100644
index 00000000..de4435a6
--- /dev/null
+++ b/client/src/translations/rules/Schess/en.pug
@@ -0,0 +1,40 @@
+p.boxed
+  | You have two new pieces in a pocket, which can appear after any
+  | first piece movement.
+
+p.
+  When a piece is moved for the first time, it is possible to place a new
+  piece at its initial square.
+  You have two pieces that can enter the game like this:
+ul
+  li The Hawk (H): moving like a bishop + knight.
+  li The Elephant (E): moving like a rook + knight.
+
+figure.diagram-container
+  .diagram
+    | fen:rnbqkbnr/pppppppp/8/8/8/2N5/PPPPPPPP/REBQKBNR:
+  figcaption.
+    Position after 1.Nc3/E. White moved his knight from b1 to c3 and placed
+    the elephant on b1.
+
+p.
+  After castling, a new piece can be put at the initial king square
+  (if not occupied), or at the initial rook square - but not both.
+
+p.
+  If a move let the king under check, then it is forbidden,
+  even if placing a pocket piece would have covered the check.
+
+h3 Source
+
+p
+  | Some explanations about the rules and a link to buy a physical S-Chess set
+  | on the 
+  a(href="http://www.seirawanchess.com/") Seirawan Chess page
+  | . This variant is playable on 
+  a(href="https://www.pychess.org/variant/seirawan") pychess-variants
+  | &nbsp;with an engine available for analysis. See also the 
+  a(href="https://en.wikipedia.org/wiki/Seirawan_chess") Wikipedia page
+  | .
+
+p Inventors: Yasser Seirawan and Bruce Harper (2008)
diff --git a/client/src/translations/rules/Schess/es.pug b/client/src/translations/rules/Schess/es.pug
new file mode 100644
index 00000000..ecac438a
--- /dev/null
+++ b/client/src/translations/rules/Schess/es.pug
@@ -0,0 +1,42 @@
+p.boxed
+  | Tienes dos piezas en tu bolsillo, que pueden aparecer después
+  | cualquier movimiento inicial de una pieza.
+
+p.
+  Cuando una pieza se mueve por la primera vez, una pieza nueva
+  se puede colocar en su casilla inicial.
+  Tienes dos piezas que también pueden ingresar al juego:
+ul
+  li El Aguila (H): se mueve como un alfil + caballo.
+  li El Elefante (E): se mueve como una torre + caballo.
+
+figure.diagram-container
+  .diagram
+    | fen:rnbqkbnr/pppppppp/8/8/8/2N5/PPPPPPPP/REBQKBNR:
+  figcaption.
+    Posición después de 1.Nc3/E. Las blancas mueven su caballo de b1 a c3
+    y colocar el elefante en b1.
+
+p.
+  Después de haberse enrocado, se puede colocar una nueva pieza en la
+  casilla inicial del rey (si no está ocupado), o en el espacio inicial de
+  la torre, pero no en ambos.
+
+p.
+  Si un movimiento deja al rey en jaque, entonces está prohibido,
+  incluso si colocar una nueva pieza hubiera sido el jaque.
+
+h3 Fuente
+
+p
+  | Algunas explicaciones sobre las reglas, así como un enlace para comprar
+  | un conjunto de piezas de S-Chess en el
+  a(href="http://www.seirawanchess.com/") página Seirawan Chess
+  | . Esta variante se puede jugar en 
+  a(href="https://www.pychess.org/variant/seirawan") pychess-variantes
+  | &nbsp;con un módulo disponible para análisis. Ver también la 
+  a(href= "https://www.pousseurdebois.fr/variantes-du-jeu-dechecs/echecsseirawan/")
+  a(href="https://en.wikipedia.org/wiki/Seirawan_chess") página Wikipedia
+  | .
+
+p Inventores: Yasser Seirawan y Bruce Harper (2008)
diff --git a/client/src/translations/rules/Schess/fr.pug b/client/src/translations/rules/Schess/fr.pug
new file mode 100644
index 00000000..ed55d9f5
--- /dev/null
+++ b/client/src/translations/rules/Schess/fr.pug
@@ -0,0 +1,41 @@
+p.boxed
+  | Vous avez deux pièces en poche, qui peuvent apparaitre après
+  | n'importe quel déplacement initial d'une pièce.
+
+p.
+  Quand une pièce est déplacée pour la première fois, une nouvelle pièce
+  peut être placée sur sa case de départ.
+  Vous avez deux pièces pouvant entrer dans le jeu ainsi :
+ul
+  li L'Aigle (H) : se déplace comme un fou + cavalier.
+  li L'Éléphant (E) : se déplace comme une tour + cavalier.
+
+figure.diagram-container
+  .diagram
+    | fen:rnbqkbnr/pppppppp/8/8/8/2N5/PPPPPPPP/REBQKBNR:
+  figcaption.
+    Position après 1.Nc3/E. Les blancs déplacent leur cavalier de b1 à c3
+    et placent l'éléphant en b1.
+
+p.
+  Après avoir roqué, une nouvelle pièce peut être placée sur la case
+  initiale du roi (si elle n'est pas occupée), ou sur la case initiale de la
+  tour - mais pas sur les deux.
+
+p.
+  Si un coup laisse le roi en échec, alors il est interdit,
+  même si le placement d'une nouvelle pièce aurait paré l'échec.
+
+h3 Source
+
+p
+  | Quelques explications sur les règles ainsi qu'un lien pour acheter
+  | un jeu de pièces de S-Chess sur la 
+  a(href="http://www.seirawanchess.com/") page Seirawan Chess
+  | . Cette variante est jouable sur 
+  a(href="https://www.pychess.org/variant/seirawan") pychess-variants
+  | &nbsp;avec un module disponible pour l'analyse. Voir aussi 
+  a(href="https://www.pousseurdebois.fr/variantes-du-jeu-dechecs/echecsseirawan/")
+    | cette page.
+
+p Inventeurs : Yasser Seirawan et Bruce Harper (2008)
diff --git a/client/src/variants/Ball.js b/client/src/variants/Ball.js
index cf50a809..5a23e9f8 100644
--- a/client/src/variants/Ball.js
+++ b/client/src/variants/Ball.js
@@ -129,7 +129,7 @@ export class BallRules extends ChessRules {
 
   static GenRandInitFen(randomness) {
     if (randomness == 0)
-      return "rnbqkwbnr/ppppppppp/9/9/4a4/9/9/PPPPPPPPP/RNBQKWBNR w 0 -";
+      return "rnbqkwnbr/ppppppppp/9/9/4a4/9/9/PPPPPPPPP/RNBQKWNBR w 0 -";
 
     let pieces = { w: new Array(9), b: new Array(9) };
     for (let c of ["w", "b"]) {
diff --git a/client/src/variants/Cannibal.js b/client/src/variants/Cannibal.js
index a08f1975..b66ac382 100644
--- a/client/src/variants/Cannibal.js
+++ b/client/src/variants/Cannibal.js
@@ -234,4 +234,19 @@ export class CannibalRules extends ChessRules {
   static get SEARCH_DEPTH() {
     return 4;
   }
+
+  getNotation(move) {
+    let notation = super.getNotation(move);
+    const lastRank = (move.appear[0].c == "w" ? 0 : 7);
+    if (
+      move.end.x != lastRank &&
+      this.getPiece(move.start.x, move.start.y) == V.PAWN &&
+      move.vanish.length == 2 &&
+      move.appear[0].p != V.PAWN
+    ) {
+      // Fix "promotion" (transform indicator) from base_rules notation
+      notation = notation.slice(0, -2);
+    }
+    return notation;
+  }
 };
diff --git a/client/src/variants/Checkered.js b/client/src/variants/Checkered.js
index 882a32ac..799c3e54 100644
--- a/client/src/variants/Checkered.js
+++ b/client/src/variants/Checkered.js
@@ -71,8 +71,8 @@ export class CheckeredRules extends ChessRules {
   setFlags(fenflags) {
     super.setFlags(fenflags); //castleFlags
     this.pawnFlags = {
-      w: [...Array(8).fill(true)], //pawns can move 2 squares?
-      b: [...Array(8).fill(true)]
+      w: [...Array(8)], //pawns can move 2 squares?
+      b: [...Array(8)]
     };
     const flags = fenflags.substr(4); //skip first 4 letters, for castle
     for (let c of ["w", "b"]) {
@@ -402,19 +402,19 @@ export class CheckeredRules extends ChessRules {
 
   getFen() {
     const L = this.cmoves.length;
-    const cmoveFen = !this.cmoves[L - 1]
-      ? "-"
-      : ChessRules.CoordsToSquare(this.cmoves[L - 1].start) +
-        ChessRules.CoordsToSquare(this.cmoves[L - 1].end);
+    const cmoveFen =
+      !this.cmoves[L - 1]
+        ? "-"
+        : ChessRules.CoordsToSquare(this.cmoves[L - 1].start) +
+          ChessRules.CoordsToSquare(this.cmoves[L - 1].end);
     return super.getFen() + " " + cmoveFen;
   }
 
   getFlagsFen() {
     let fen = super.getFlagsFen();
     // Add pawns flags
-    for (let c of ["w", "b"]) {
-      for (let i = 0; i < 8; i++) fen += this.pawnFlags[c][i] ? "1" : "0";
-    }
+    for (let c of ["w", "b"])
+      for (let i = 0; i < 8; i++) fen += (this.pawnFlags[c][i] ? "1" : "0");
     return fen;
   }
 
diff --git a/client/src/variants/Schess.js b/client/src/variants/Schess.js
new file mode 100644
index 00000000..7cbb47a1
--- /dev/null
+++ b/client/src/variants/Schess.js
@@ -0,0 +1,308 @@
+import { ChessRules, PiPo } from "@/base_rules";
+
+export class SchessRules extends ChessRules {
+  static get PawnSpecs() {
+    return Object.assign(
+      {},
+      ChessRules.PawnSpecs,
+      {
+        promotions:
+          ChessRules.PawnSpecs.promotions.concat([V.HAWK, V.ELEPHANT])
+      }
+    );
+  }
+
+  static get HAWK() {
+    return 'h';
+  }
+
+  static get ELEPHANT() {
+    return 'e';
+  }
+
+  static get PIECES() {
+    return ChessRules.PIECES.concat([V.HAWK, V.ELEPHANT]);
+  }
+
+  getPpath(b) {
+    if ([V.HAWK, V.ELEPHANT].includes(b[1])) return "Schess/" + b;
+    return b;
+  }
+
+  // TODO: maybe changes could be done to this method to show "empty"
+  // instead of a piece to not use a pocket piece...
+//  getPPpath(b) { }
+
+  static IsGoodFen(fen) {
+    if (!ChessRules.IsGoodFen(fen)) return false;
+    const fenParsed = V.ParseFen(fen);
+    // Check pocket state
+    if (!fenParsed.pocket || !fenParsed.pocket.match(/^[0-1]{4,4}$/))
+      return false;
+    return true;
+  }
+
+  static IsGoodFlags(flags) {
+    // 4 for castle + 16 for generators
+    return !!flags.match(/^[a-z]{4,4}[01]{16,16}$/);
+  }
+
+  setFlags(fenflags) {
+    super.setFlags(fenflags); //castleFlags
+    this.pieceFlags = {
+      w: [...Array(8)], //pawns can move 2 squares?
+      b: [...Array(8)]
+    };
+    const flags = fenflags.substr(4); //skip first 4 letters, for castle
+    for (let c of ["w", "b"]) {
+      for (let i = 0; i < 8; i++)
+        this.pieceFlags[c][i] = flags.charAt((c == "w" ? 0 : 8) + i) == "1";
+    }
+  }
+
+  aggregateFlags() {
+    return [this.castleFlags, this.pieceFlags];
+  }
+
+  disaggregateFlags(flags) {
+    this.castleFlags = flags[0];
+    this.pieceFlags = flags[1];
+  }
+
+  static ParseFen(fen) {
+    const fenParts = fen.split(" ");
+    return Object.assign(
+      ChessRules.ParseFen(fen),
+      { pocket: fenParts[5] }
+    );
+  }
+
+  static GenRandInitFen(randomness) {
+    return (
+      ChessRules.GenRandInitFen(randomness).slice(0, -2) +
+      // Add pieceFlags + pocket
+      "1111111111111111 - 1111"
+    );
+  }
+
+  getFen() {
+    return (
+      super.getFen() + " " +
+      this.getPocketFen()
+    );
+  }
+
+  getFenForRepeat() {
+    return (
+      super.getFenForRepeat() + "_" +
+      this.getPocketFen()
+    );
+  }
+
+  getFlagsFen() {
+    let fen = super.getFlagsFen();
+    // Add pieces flags
+    for (let c of ["w", "b"])
+      for (let i = 0; i < 8; i++) fen += (this.pieceFlags[c][i] ? "1" : "0");
+    return fen;
+  }
+
+  getPocketFen() {
+    let res = "";
+    for (let c of ["w", "b"])
+      res += this.pocket[c][V.HAWK] + this.pocket[c][V.ELEPHANT];
+    return res;
+  }
+
+  setOtherVariables(fen) {
+    super.setOtherVariables(fen);
+    const fenParsed = V.ParseFen(fen);
+    this.pocket = {
+      "w": {
+        h: parseInt(fenParsed.pocket[0]),
+        e: parseInt(fenParsed.pocket[1])
+      },
+      "b": {
+        h: parseInt(fenParsed.pocket[2]),
+        e: parseInt(fenParsed.pocket[3])
+      }
+    };
+  }
+
+  getPotentialMovesFrom([x, y]) {
+    let moves = undefined;
+    switch (this.getPiece(x, y)) {
+      case V.HAWK:
+        moves = this.getPotentialHawkMoves([x, y]);
+        break;
+      case V.ELEPHANT:
+        moves = this.getPotentialElephantMoves([x, y]);
+        break;
+      default:
+        moves = super.getPotentialMovesFrom([x, y]);
+    }
+    // Post-processing: add choices for hawk and elephant,
+    // except for moves letting the king under check.
+    const color = this.turn;
+    if (Object.values(this.pocket[color]).some(v => v > 0)) {
+      const firstRank = (color == "w" ? 7 : 0);
+      let pocketMoves = [];
+      moves.forEach(m => {
+        let inCheckAfter = false;
+        this.play(m);
+        if (this.underCheck(color)) inCheckAfter = true;
+        this.undo(m);
+        if (!inCheckAfter) {
+          for (let pp of ['h', 'e']) {
+            if (this.pocket[color][pp] > 0) {
+              if (
+                m.start.x == firstRank &&
+                this.pieceFlags[color][m.start.y] &&
+                (
+                  m.appear.length == 1 ||
+                  // Special castle case: is initial king square free?
+                  ![m.appear[0].y, m.appear[1].y].includes(m.vanish[0].y)
+                )
+              ) {
+                let pMove = JSON.parse(JSON.stringify(m));
+                // NOTE: unshift instead of push, for choices presentation
+                pMove.appear.unshift(new PiPo({
+                  p: pp,
+                  c: color,
+                  x: x,
+                  y: y
+                }));
+                pocketMoves.push(pMove);
+              }
+              if (
+                m.appear.length == 2 &&
+                ![m.appear[0].y, m.appear[1].y].includes(m.vanish[1].y)
+              ) {
+                // Special castle case: rook flag was necessarily on
+                let pMove = JSON.parse(JSON.stringify(m));
+                pMove.appear.unshift(new PiPo({
+                  p: pp,
+                  c: color,
+                  x: m.vanish[1].x,
+                  y: m.vanish[1].y
+                }));
+                pocketMoves.push(pMove);
+              }
+            }
+          }
+        }
+      });
+      // NOTE: the order matter, for presentation on screen
+      moves = moves.concat(pocketMoves);
+    }
+    return moves;
+  }
+
+  getPotentialHawkMoves(sq) {
+    return this.getSlideNJumpMoves(
+      sq,
+      V.steps[V.BISHOP].concat(V.steps[V.KNIGHT])
+    );
+  }
+
+  getPotentialElephantMoves(sq) {
+    return this.getSlideNJumpMoves(
+      sq,
+      V.steps[V.ROOK].concat(V.steps[V.KNIGHT])
+    );
+  }
+
+  isAttacked(sq, color) {
+    return (
+      super.isAttacked(sq, color) ||
+      this.isAttackedByHawk(sq, color) ||
+      this.isAttackedByElephant(sq, color)
+    );
+  }
+
+  isAttackedByHawk(sq, color) {
+    return this.isAttackedBySlideNJump(
+      sq,
+      color,
+      V.HAWK,
+      V.steps[V.BISHOP].concat(V.steps[V.KNIGHT])
+    );
+  }
+
+  isAttackedByElephant(sq, color) {
+    return this.isAttackedBySlideNJump(
+      sq,
+      color,
+      V.ELEPHANT,
+      V.steps[V.ROOK].concat(V.steps[V.KNIGHT])
+    );
+  }
+
+  prePlay(move) {
+    super.prePlay(move);
+    if (move.appear.length >= 2) {
+      if ([V.HAWK, V.ELEPHANT].includes(move.appear[0].p)) {
+        // A pocket piece is used
+        const color = this.turn;
+        this.pocket[color][move.appear[0].p] = 0;
+      }
+    }
+  }
+
+  postPlay(move) {
+    super.postPlay(move);
+    const color = move.vanish[0].c;
+    const oppCol = V.GetOppCol(color);
+    const firstRank = (color == 'w' ? 7 : 0);
+    const oppFirstRank = 7 - firstRank;
+    // Does this move turn off a piece init square flag?
+    if (move.start.x == firstRank) {
+      if (this.pieceFlags[color][move.start.y])
+        this.pieceFlags[color][move.start.y] = false;
+      // Special castle case:
+      if (move.appear.length >= 2) {
+        const L = move.appear.length;
+        if (move.appear[L-1].p == V.ROOK)
+          this.pieceFlags[color][move.vanish[1].y] = false;
+      }
+    }
+    if (move.end.x == oppFirstRank && this.pieceFlags[oppCol][move.end.y])
+      this.pieceFlags[oppCol][move.end.y] = false;
+  }
+
+  postUndo(move) {
+    super.postUndo(move);
+    if (move.appear.length >= 2) {
+      if ([V.HAWK, V.ELEPHANT].includes(move.appear[0].p)) {
+        // A pocket piece was used
+        const color = this.turn;
+        this.pocket[color][move.appear[0].p] = 1;
+      }
+    }
+  }
+
+  static get SEARCH_DEPTH() {
+    return 2;
+  }
+
+  static get VALUES() {
+    return Object.assign(
+      {},
+      ChessRules.VALUES,
+      { 'h': 5, 'e': 7 }
+    );
+  }
+
+  getNotation(move) {
+    if (
+      move.appear.length >= 2 &&
+      [V.HAWK, V.ELEPHANT].includes(move.appear[0].p)
+    ) {
+      const suffix = "/" + move.appear[0].p.toUpperCase();
+      let cmove = JSON.parse(JSON.stringify(move));
+      cmove.appear.shift();
+      return super.getNotation(cmove) + suffix;
+    }
+    return super.getNotation(move);
+  }
+};
diff --git a/client/src/variants/Twokings.js b/client/src/variants/Twokings.js
index 9e82a245..ce30d653 100644
--- a/client/src/variants/Twokings.js
+++ b/client/src/variants/Twokings.js
@@ -54,8 +54,50 @@ export class TwokingsRules extends CoregalRules {
   }
 
   static GenRandInitFen(randomness) {
-    const fen = CoregalRules.GenRandInitFen(randomness);
-    return fen.replace("q", "k").replace("Q", "K");
+    if (randomness == 0)
+      return "rnqkkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNQKKBNR w 0 adehadeh -";
+
+    const replaceBishop = (fen, first, ch1, ch2) => {
+      // Remove and re-add final part:
+      const suffix = fen.substr(-15);
+      fen = fen.slice(0, -15);
+      if (first) fen = fen.replace(ch1, ch2);
+      else {
+        fen =
+          fen.split("").reverse().join("")
+          .replace(ch1, ch2)
+          .split("").reverse().join("")
+      }
+      return fen + suffix;
+    };
+
+    const sameIndexReplace = (fen) => {
+      const first = (Math.random() < 0.5);
+      return replaceBishop(
+        replaceBishop(fen, first, 'B', 'Q'),
+        first,
+        'b',
+        'q'
+      );
+    };
+
+    const fen =
+      CoregalRules.GenRandInitFen(randomness)
+      .replace("q", "k").replace("Q", "K");
+    // Now replace a bishop by the queen,
+    // so that bishops are of different colors:
+    if (randomness == 1) return sameIndexReplace(fen);
+    const wOdd = fen.indexOf('B') % 2;
+    const bOdd = fen.indexOf('b') % 2;
+    // Since there are 7 slashes, different oddities means symmetric
+    if (wOdd != bOdd) return sameIndexReplace(fen);
+    const wFirst = (Math.random() < 0.5);
+    return replaceBishop(
+      replaceBishop(fen, wFirst, 'B', 'Q'),
+      !wFirst,
+      'b',
+      'q'
+    );
   }
 
   underCheck(color) {
diff --git a/client/src/views/Hall.vue b/client/src/views/Hall.vue
index 9bb913c4..28635469 100644
--- a/client/src/views/Hall.vue
+++ b/client/src/views/Hall.vue
@@ -80,6 +80,7 @@ main
             option(value="")
             option(
               v-for="p in Object.values(people)"
+              v-if="!!p.name"
               :value="p.name"
             )
               | {{ p.name }}
diff --git a/server/db/populate.sql b/server/db/populate.sql
index a0d4c843..215a9b72 100644
--- a/server/db/populate.sql
+++ b/server/db/populate.sql
@@ -41,6 +41,7 @@ insert or ignore into Variants (name,description) values
   ('Recycle', 'Reuse pieces'),
   ('Royalrace', 'Kings cross the 11x11 board'),
   ('Rugby', 'Transform an essay'),
+  ('Schess', 'Seirawan-Harper Chess'),
   ('Shatranj', 'Ancient rules'),
   ('Suicide', 'Lose all pieces'),
   ('Suction', 'Attract opposite king'),
-- 
2.44.0