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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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)
) {
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)
) {
"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",
"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",
"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",
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.
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.
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.
--- /dev/null
+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
+ | 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)
--- /dev/null
+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
+ | 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)
--- /dev/null
+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
+ | 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)
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"]) {
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;
+ }
};
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"]) {
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;
}
--- /dev/null
+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);
+ }
+};
}
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) {
option(value="")
option(
v-for="p in Object.values(people)"
+ v-if="!!p.name"
:value="p.name"
)
| {{ p.name }}
('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'),
projects / vchess.git / commitdiff
