import { ChessRules, Move, PiPo } from "@/base_rules";
export class CheckeredRules extends ChessRules {
+
static board2fen(b) {
const checkered_codes = {
p: "s",
return (b[0] == "c" ? "Checkered/" : "") + b;
}
+ static get Options() {
+ return Object.assign(
+ {},
+ ChessRules.Options,
+ {
+ check: [
+ {
+ label: "With switch",
+ defaut: true,
+ variable: "switch"
+ }
+ ]
+ }
+ );
+ }
+
+ static AbbreviateOptions(opts) {
+ return (!opts["switch"] ? "NS" : "");
+ }
+
setOtherVariables(fen) {
super.setOtherVariables(fen);
// Local stack of non-capturing checkered moves:
end: ChessRules.SquareToCoords(cmove.substr(2))
});
}
+ // Stage 1: as Checkered2. Stage 2: checkered pieces are autonomous
+ const stageInfo = V.ParseFen(fen).stage;
+ this.stage = parseInt(stageInfo[0], 10);
+ this.canSwitch = (this.stage == 1 && stageInfo[1] != '-');
+ this.sideCheckered = (this.stage == 2 ? stageInfo[1] : undefined);
}
static IsGoodFen(fen) {
if (!ChessRules.IsGoodFen(fen)) return false;
const fenParts = fen.split(" ");
- if (fenParts.length != 6) return false;
+ if (fenParts.length != 7) return false;
if (fenParts[5] != "-" && !fenParts[5].match(/^([a-h][1-8]){2}$/))
return false;
+ if (!fenParts[6].match(/^[12][wb-]?$/)) return false;
return true;
}
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"]) {
}
getEpSquare(moveOrSquare) {
- if (typeof moveOrSquare !== "object" || moveOrSquare.appear[0].c != 'c')
+ // At stage 2, all pawns can be captured en-passant
+ if (
+ this.stage == 2 ||
+ typeof moveOrSquare !== "object" ||
+ (moveOrSquare.appear.length > 0 && moveOrSquare.appear[0].c != 'c')
+ )
return super.getEpSquare(moveOrSquare);
- // Checkered move: no en-passant
+ // Checkered or switch move: no en-passant
return undefined;
}
getCmove(move) {
- if (move.appear[0].c == "c" && move.vanish.length == 1)
+ // No checkered move to undo at stage 2:
+ if (this.stage == 1 && move.vanish.length == 1 && move.appear[0].c == "c")
return { start: move.start, end: move.end };
return null;
}
canTake([x1, y1], [x2, y2]) {
const color1 = this.getColor(x1, y1);
const color2 = this.getColor(x2, y2);
+ if (this.stage == 2) {
+ // Black & White <-- takes --> Checkered
+ const color1 = this.getColor(x1, y1);
+ const color2 = this.getColor(x2, y2);
+ return color1 != color2 && [color1, color2].includes('c');
+ }
// Checkered aren't captured
return (
color1 != color2 &&
);
}
- // Post-processing: apply "checkerization" of standard moves
- getPotentialMovesFrom([x, y]) {
+ getPotentialMovesFrom([x, y], noswitch) {
let standardMoves = super.getPotentialMovesFrom([x, y]);
- const lastRank = this.turn == "w" ? 0 : 7;
- // King is treated differently: it never turn checkered
- if (this.getPiece(x, y) == V.KING) return standardMoves;
- let moves = [];
- standardMoves.forEach(m => {
- if (m.vanish[0].p == V.PAWN) {
- if (
- Math.abs(m.end.x - m.start.x) == 2 &&
- !this.pawnFlags[this.turn][m.start.y]
- ) {
- return; //skip forbidden 2-squares jumps
- }
+ if (this.stage == 1) {
+ const color = this.turn;
+ // Post-processing: apply "checkerization" of standard moves
+ const lastRank = (color == "w" ? 0 : 7);
+ let moves = [];
+ // King is treated differently: it never turn checkered
+ if (this.getPiece(x, y) == V.KING) {
+ // If at least one checkered piece, allow switching:
if (
- this.board[m.end.x][m.end.y] == V.EMPTY &&
- m.vanish.length == 2 &&
- this.getColor(m.start.x, m.start.y) == "c"
+ this.canSwitch && !noswitch &&
+ this.board.some(b => b.some(cell => cell[0] == 'c'))
) {
- return; //checkered pawns cannot take en-passant
+ const oppCol = V.GetOppCol(color);
+ moves.push(
+ new Move({
+ start: { x: x, y: y },
+ end: { x: this.kingPos[oppCol][0], y: this.kingPos[oppCol][1] },
+ appear: [],
+ vanish: []
+ })
+ );
}
+ return standardMoves.concat(moves);
}
- if (m.vanish.length == 1)
- // No capture
- moves.push(m);
- else {
- // A capture occured (m.vanish.length == 2)
- m.appear[0].c = "c";
- moves.push(m);
- if (
- // Avoid promotions (already treated):
- m.appear[0].p != m.vanish[1].p &&
- (m.vanish[0].p != V.PAWN || m.end.x != lastRank)
- ) {
- // Add transformation into captured piece
- let m2 = JSON.parse(JSON.stringify(m));
- m2.appear[0].p = m.vanish[1].p;
- moves.push(m2);
+ standardMoves.forEach(m => {
+ if (m.vanish[0].p == V.PAWN) {
+ if (
+ Math.abs(m.end.x - m.start.x) == 2 &&
+ !this.pawnFlags[this.turn][m.start.y]
+ ) {
+ return; //skip forbidden 2-squares jumps
+ }
+ if (
+ this.board[m.end.x][m.end.y] == V.EMPTY &&
+ m.vanish.length == 2 &&
+ this.getColor(m.start.x, m.start.y) == "c"
+ ) {
+ return; //checkered pawns cannot take en-passant
+ }
}
- }
- });
- return moves;
+ if (m.vanish.length == 1)
+ // No capture
+ moves.push(m);
+ else {
+ // A capture occured (m.vanish.length == 2)
+ m.appear[0].c = "c";
+ moves.push(m);
+ if (
+ // Avoid promotions (already treated):
+ m.appear[0].p != m.vanish[1].p &&
+ (m.vanish[0].p != V.PAWN || m.end.x != lastRank)
+ ) {
+ // Add transformation into captured piece
+ let m2 = JSON.parse(JSON.stringify(m));
+ m2.appear[0].p = m.vanish[1].p;
+ moves.push(m2);
+ }
+ }
+ });
+ return moves;
+ }
+ return standardMoves;
}
getPotentialPawnMoves([x, y]) {
+ const color = this.getColor(x, y);
+ if (this.stage == 2) {
+ const saveTurn = this.turn;
+ if (this.sideCheckered == this.turn) {
+ // Cannot change PawnSpecs.bidirectional, so cheat a little:
+ this.turn = 'w';
+ const wMoves = super.getPotentialPawnMoves([x, y]);
+ this.turn = 'b';
+ const bMoves = super.getPotentialPawnMoves([x, y]);
+ this.turn = saveTurn;
+ return wMoves.concat(bMoves);
+ }
+ // Playing with both colors:
+ this.turn = color;
+ const moves = super.getPotentialPawnMoves([x, y]);
+ this.turn = saveTurn;
+ return moves;
+ }
let moves = super.getPotentialPawnMoves([x, y]);
// Post-process: set right color for checkered moves
- if (this.getColor(x, y) == 'c')
+ if (color == 'c') {
moves.forEach(m => {
m.appear[0].c = 'c'; //may be done twice if capture
m.vanish[0].c = 'c';
});
+ }
return moves;
}
canIplay(side, [x, y]) {
+ if (this.stage == 2) {
+ const color = this.getColor(x, y);
+ return (
+ this.turn == this.sideCheckered
+ ? color == 'c'
+ : ['w', 'b'].includes(color)
+ );
+ }
return side == this.turn && [side, "c"].includes(this.getColor(x, y));
}
// Does m2 un-do m1 ? (to disallow undoing checkered moves)
oppositeMoves(m1, m2) {
return (
- m1 &&
+ !!m1 &&
m2.appear[0].c == "c" &&
m2.appear.length == 1 &&
m2.vanish.length == 1 &&
filterValid(moves) {
if (moves.length == 0) return [];
const color = this.turn;
+ const oppCol = V.GetOppCol(color);
const L = this.cmoves.length; //at least 1: init from FEN
+ const stage = this.stage; //may change if switch
return moves.filter(m => {
- if (this.oppositeMoves(this.cmoves[L - 1], m)) return false;
+ // Checkered cannot be under check (no king)
+ if (stage == 2 && this.sideCheckered == color) return true;
this.play(m);
- const res = !this.underCheck(color);
+ let res = true;
+ if (stage == 1) {
+ if (m.appear.length == 0 && m.vanish.length == 0) {
+ // Special "switch" move: kings must not be attacked by checkered.
+ // Not checking for oppositeMoves here: checkered are autonomous
+ res = (
+ !this.isAttacked(this.kingPos['w'], ['c']) &&
+ !this.isAttacked(this.kingPos['b'], ['c']) &&
+ this.getAllPotentialMoves().length > 0
+ );
+ }
+ else res = !this.oppositeMoves(this.cmoves[L - 1], m);
+ }
+ if (res && m.appear.length > 0) res = !this.underCheck(color);
+ // At stage 2, side with B & W can be undercheck with both kings:
+ if (res && stage == 2) res = !this.underCheck(oppCol);
this.undo(m);
return res;
});
}
- getAllValidMoves() {
- const oppCol = V.GetOppCol(this.turn);
+ getAllPotentialMoves() {
+ const color = this.turn;
+ const oppCol = V.GetOppCol(color);
let potentialMoves = [];
for (let i = 0; i < V.size.x; i++) {
for (let j = 0; j < V.size.y; j++) {
- // NOTE: just testing == color isn't enough because of checkred pieces
- if (this.board[i][j] != V.EMPTY && this.getColor(i, j) != oppCol) {
+ const colIJ = this.getColor(i, j);
+ if (
+ this.board[i][j] != V.EMPTY &&
+ (
+ (this.stage == 1 && colIJ != oppCol) ||
+ (this.stage == 2 &&
+ (
+ (this.sideCheckered == color && colIJ == 'c') ||
+ (this.sideCheckered != color && ['w', 'b'].includes(colIJ))
+ )
+ )
+ )
+ ) {
Array.prototype.push.apply(
potentialMoves,
this.getPotentialMovesFrom([i, j])
}
}
}
- return this.filterValid(potentialMoves);
+ return potentialMoves;
}
atLeastOneMove() {
- const oppCol = V.GetOppCol(this.turn);
+ const color = this.turn;
+ const oppCol = V.GetOppCol(color);
for (let i = 0; i < V.size.x; i++) {
for (let j = 0; j < V.size.y; j++) {
- // NOTE: just testing == color isn't enough because of checkered pieces
- if (this.board[i][j] != V.EMPTY && this.getColor(i, j) != oppCol) {
- const moves = this.getPotentialMovesFrom([i, j]);
+ const colIJ = this.getColor(i, j);
+ if (
+ this.board[i][j] != V.EMPTY &&
+ (
+ (this.stage == 1 && colIJ != oppCol) ||
+ (this.stage == 2 &&
+ (
+ (this.sideCheckered == color && colIJ == 'c') ||
+ (this.sideCheckered != color && ['w', 'b'].includes(colIJ))
+ )
+ )
+ )
+ ) {
+ const moves = this.getPotentialMovesFrom([i, j], "noswitch");
if (moves.length > 0) {
- for (let k = 0; k < moves.length; k++) {
+ for (let k = 0; k < moves.length; k++)
if (this.filterValid([moves[k]]).length > 0) return true;
- }
}
}
}
return false;
}
- // colors: array, generally 'w' and 'c' or 'b' and 'c'
+ // colors: array, 'w' and 'c' or 'b' and 'c' at stage 1,
+ // just 'c' (or unused) at stage 2
isAttacked(sq, colors) {
if (!Array.isArray(colors)) colors = [colors];
return (
isAttackedByPawn([x, y], colors) {
for (let c of colors) {
- const color = (c == "c" ? this.turn : c);
- let pawnShift = color == "w" ? 1 : -1;
- if (x + pawnShift >= 0 && x + pawnShift < 8) {
- for (let i of [-1, 1]) {
- if (
- y + i >= 0 &&
- y + i < 8 &&
- this.getPiece(x + pawnShift, y + i) == V.PAWN &&
- this.getColor(x + pawnShift, y + i) == c
- ) {
- return true;
+ let shifts = [];
+ if (this.stage == 1) {
+ const color = (c == "c" ? this.turn : c);
+ shifts = [color == "w" ? 1 : -1];
+ }
+ else {
+ // Stage 2: checkered pawns are bidirectional
+ if (c == 'c') shifts = [-1, 1];
+ else shifts = [c == "w" ? 1 : -1];
+ }
+ for (let pawnShift of shifts) {
+ if (x + pawnShift >= 0 && x + pawnShift < 8) {
+ for (let i of [-1, 1]) {
+ if (
+ y + i >= 0 &&
+ y + i < 8 &&
+ this.getPiece(x + pawnShift, y + i) == V.PAWN &&
+ this.getColor(x + pawnShift, y + i) == c
+ ) {
+ return true;
+ }
}
}
}
}
isAttackedByBishop(sq, colors) {
- return this.isAttackedBySlideNJump(sq, colors, V.BISHOP, V.steps[V.BISHOP]);
+ return this.isAttackedBySlideNJump(
+ sq, colors, V.BISHOP, V.steps[V.BISHOP]);
}
isAttackedByQueen(sq, colors) {
}
underCheck(color) {
- return this.isAttacked(this.kingPos[color], [V.GetOppCol(color), "c"]);
- }
-
- getCheckSquares(color) {
- // Artifically change turn, for checkered pawns
- this.turn = V.GetOppCol(color);
- const kingAttacked = this.isAttacked(this.kingPos[color], [
- V.GetOppCol(color),
- "c"
- ]);
- let res = kingAttacked
- ? [JSON.parse(JSON.stringify(this.kingPos[color]))] //need to duplicate!
- : [];
- this.turn = color;
+ if (this.stage == 1)
+ return this.isAttacked(this.kingPos[color], [V.GetOppCol(color), "c"]);
+ if (color == this.sideCheckered) return false;
+ return (
+ this.isAttacked(this.kingPos['w'], ["c"]) ||
+ this.isAttacked(this.kingPos['b'], ["c"])
+ );
+ }
+
+ getCheckSquares() {
+ const color = this.turn;
+ if (this.stage == 1) {
+ // Artifically change turn, for checkered pawns
+ this.turn = V.GetOppCol(color);
+ const kingAttacked =
+ this.isAttacked(
+ this.kingPos[color],
+ [V.GetOppCol(color), "c"]
+ );
+ let res = kingAttacked
+ ? [JSON.parse(JSON.stringify(this.kingPos[color]))]
+ : [];
+ this.turn = color;
+ return res;
+ }
+ if (this.sideCheckered == color) return [];
+ let res = [];
+ for (let c of ['w', 'b']) {
+ if (this.isAttacked(this.kingPos[c], ['c']))
+ res.push(JSON.parse(JSON.stringify(this.kingPos[c])));
+ }
return res;
}
+ play(move) {
+ move.flags = JSON.stringify(this.aggregateFlags());
+ this.epSquares.push(this.getEpSquare(move));
+ V.PlayOnBoard(this.board, move);
+ if (move.appear.length > 0 || move.vanish.length > 0)
+ {
+ this.turn = V.GetOppCol(this.turn);
+ this.movesCount++;
+ }
+ this.postPlay(move);
+ }
+
postPlay(move) {
- super.postPlay(move);
- // Does this move turn off a 2-squares pawn flag?
- if ([1, 6].includes(move.start.x) && move.vanish[0].p == V.PAWN)
- this.pawnFlags[move.start.x == 6 ? "w" : "b"][move.start.y] = false;
+ if (move.appear.length == 0 && move.vanish.length == 0) {
+ this.stage = 2;
+ this.sideCheckered = this.turn;
+ }
+ else {
+ const c = move.vanish[0].c;
+ const piece = move.vanish[0].p;
+ if (piece == V.KING) {
+ this.kingPos[c][0] = move.appear[0].x;
+ this.kingPos[c][1] = move.appear[0].y;
+ }
+ super.updateCastleFlags(move, piece);
+ if (
+ [1, 6].includes(move.start.x) &&
+ move.vanish[0].p == V.PAWN &&
+ Math.abs(move.end.x - move.start.x) == 2
+ ) {
+ // This move turns off a 2-squares pawn flag
+ this.pawnFlags[move.start.x == 6 ? "w" : "b"][move.start.y] = false;
+ }
+ }
this.cmoves.push(this.getCmove(move));
}
+ undo(move) {
+ this.epSquares.pop();
+ this.disaggregateFlags(JSON.parse(move.flags));
+ V.UndoOnBoard(this.board, move);
+ if (move.appear.length > 0 || move.vanish.length > 0)
+ {
+ this.turn = V.GetOppCol(this.turn);
+ this.movesCount--;
+ }
+ this.postUndo(move);
+ }
+
postUndo(move) {
- super.postUndo(move);
+ if (move.appear.length == 0 && move.vanish.length == 0) this.stage = 1;
+ else super.postUndo(move);
this.cmoves.pop();
}
getCurrentScore() {
- if (this.atLeastOneMove())
- // game not over
- return "*";
-
const color = this.turn;
- // Artifically change turn, for checkered pawns
- this.turn = V.GetOppCol(this.turn);
- const res = this.isAttacked(this.kingPos[color], [V.GetOppCol(color), "c"])
- ? color == "w"
- ? "0-1"
- : "1-0"
- : "1/2";
- this.turn = V.GetOppCol(this.turn);
- return res;
+ if (this.stage == 1) {
+ if (this.atLeastOneMove()) return "*";
+ // Artifically change turn, for checkered pawns
+ this.turn = V.GetOppCol(this.turn);
+ const res =
+ this.isAttacked(this.kingPos[color], [V.GetOppCol(color), "c"])
+ ? color == "w"
+ ? "0-1"
+ : "1-0"
+ : "1/2";
+ this.turn = V.GetOppCol(this.turn);
+ return res;
+ }
+ // Stage == 2:
+ if (this.sideCheckered == this.turn) {
+ // Check if remaining checkered pieces: if none, I lost
+ if (this.board.some(b => b.some(cell => cell[0] == 'c'))) {
+ if (!this.atLeastOneMove()) return "1/2";
+ return "*";
+ }
+ return color == 'w' ? "0-1" : "1-0";
+ }
+ if (this.atLeastOneMove()) return "*";
+ let res = this.isAttacked(this.kingPos['w'], ["c"]);
+ if (!res) res = this.isAttacked(this.kingPos['b'], ["c"]);
+ if (res) return color == 'w' ? "0-1" : "1-0";
+ return "1/2";
}
evalPosition() {
let evaluation = 0;
- // Just count material for now, considering checkered neutral (...)
+ // Just count material for now, considering checkered neutral at stage 1.
+ const baseSign = (this.turn == 'w' ? 1 : -1);
for (let i = 0; i < V.size.x; i++) {
for (let j = 0; j < V.size.y; j++) {
if (this.board[i][j] != V.EMPTY) {
const sqColor = this.getColor(i, j);
- if (["w","b"].includes(sqColor)) {
- const sign = sqColor == "w" ? 1 : -1;
+ if (this.stage == 1) {
+ if (["w", "b"].includes(sqColor)) {
+ const sign = sqColor == "w" ? 1 : -1;
+ evaluation += sign * V.VALUES[this.getPiece(i, j)];
+ }
+ }
+ else {
+ const sign =
+ this.sideCheckered == this.turn
+ ? (sqColor == 'c' ? 1 : -1) * baseSign
+ : (sqColor == 'c' ? -1 : 1) * baseSign;
evaluation += sign * V.VALUES[this.getPiece(i, j)];
}
}
return evaluation;
}
- static GenRandInitFen(randomness) {
- // Add 16 pawns flags + empty cmove:
- return ChessRules.GenRandInitFen(randomness)
- .slice(0, -2) + "1111111111111111 - -";
+ static GenRandInitFen(options) {
+ const baseFen = ChessRules.GenRandInitFen(options.randomness);
+ return (
+ // Add 16 pawns flags + empty cmove + stage == 1:
+ baseFen.slice(0, -2) + "1111111111111111 - - 1" +
+ (!options["switch"] ? '-' : "")
+ );
}
static ParseFen(fen) {
- return Object.assign({}, ChessRules.ParseFen(fen), {
- cmove: fen.split(" ")[5]
- });
+ const fenParts = fen.split(" ");
+ return Object.assign(
+ ChessRules.ParseFen(fen),
+ {
+ cmove: fenParts[5],
+ stage: fenParts[6]
+ }
+ );
}
- getFen() {
+ getCmoveFen() {
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);
- return super.getFen() + " " + cmoveFen;
+ return (
+ !this.cmoves[L - 1]
+ ? "-"
+ : ChessRules.CoordsToSquare(this.cmoves[L - 1].start) +
+ ChessRules.CoordsToSquare(this.cmoves[L - 1].end)
+ );
+ }
+
+ getStageFen() {
+ if (this.stage == 1) return "1" + (!this.canSwitch ? '-' : "");
+ // Stage == 2:
+ return "2" + this.sideCheckered;
+ }
+
+ getFen() {
+ return (
+ super.getFen() + " " + this.getCmoveFen() + " " + this.getStageFen()
+ );
+ }
+
+ getFenForRepeat() {
+ return (
+ super.getFenForRepeat() + "_" +
+ this.getCmoveFen() + "_" + this.getStageFen()
+ );
}
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;
}
return 2;
}
+ getComputerMove() {
+ // To simplify, prevent the bot from switching (TODO...)
+ return (
+ super.getComputerMove(
+ this.getAllValidMoves().filter(m => m.appear.length > 0)
+ )
+ );
+ }
+
getNotation(move) {
+ if (move.appear.length == 0 && move.vanish.length == 0) return "S";
if (move.appear.length == 2) {
// Castle
if (move.end.y < move.start.y) return "0-0-0";
return "0-0";
}
- // Translate final square
const finalSquare = V.CoordsToSquare(move.end);
-
const piece = this.getPiece(move.start.x, move.start.y);
+ let notation = "";
if (piece == V.PAWN) {
- // Pawn move
- let notation = "";
if (move.vanish.length > 1) {
- // Capture
const startColumn = V.CoordToColumn(move.start.y);
- notation =
- startColumn +
- "x" +
- finalSquare +
- "=" +
- move.appear[0].p.toUpperCase();
- } //no capture
- else {
- notation = finalSquare;
- if (move.appear.length > 0 && piece != move.appear[0].p)
- //promotion
- notation += "=" + move.appear[0].p.toUpperCase();
- }
- return notation;
+ notation = startColumn + "x" + finalSquare;
+ } else notation = finalSquare;
+ } else {
+ // Piece movement
+ notation =
+ piece.toUpperCase() +
+ (move.vanish.length > 1 ? "x" : "") +
+ finalSquare;
}
- // Piece movement
- return (
- piece.toUpperCase() +
- (move.vanish.length > 1 ? "x" : "") +
- finalSquare +
- (move.vanish.length > 1 ? "=" + move.appear[0].p.toUpperCase() : "")
- );
+ if (move.appear[0].p != move.vanish[0].p)
+ notation += "=" + move.appear[0].p.toUpperCase();
+ return notation;
}
+
};
projects / vchess.git / blobdiff