import { ChessRules } from "@/base_rules";
-export const VariantRules = class CheckeredRules extends ChessRules
-{
- static getPpath(b)
- {
- return b[0]=='c' ? "Checkered/"+b : b;
+export const VariantRules = class CheckeredRules extends ChessRules {
+ static getPpath(b) {
+ return b[0] == "c" ? "Checkered/" + b : b;
}
- static board2fen(b)
- {
+ static board2fen(b) {
const checkered_codes = {
- 'p': 's',
- 'q': 't',
- 'r': 'u',
- 'b': 'c',
- 'n': 'o',
+ p: "s",
+ q: "t",
+ r: "u",
+ b: "c",
+ n: "o"
};
- if (b[0]=="c")
- return checkered_codes[b[1]];
+ if (b[0] == "c") return checkered_codes[b[1]];
return ChessRules.board2fen(b);
}
- static fen2board(f)
- {
+ static fen2board(f) {
// Tolerate upper-case versions of checkered pieces (why not?)
const checkered_pieces = {
- 's': 'p',
- 'S': 'p',
- 't': 'q',
- 'T': 'q',
- 'u': 'r',
- 'U': 'r',
- 'c': 'b',
- 'C': 'b',
- 'o': 'n',
- 'O': 'n',
+ s: "p",
+ S: "p",
+ t: "q",
+ T: "q",
+ u: "r",
+ U: "r",
+ c: "b",
+ C: "b",
+ o: "n",
+ O: "n"
};
if (Object.keys(checkered_pieces).includes(f))
- return 'c'+checkered_pieces[f];
+ return "c" + checkered_pieces[f];
return ChessRules.fen2board(f);
}
- static get PIECES()
- {
- return ChessRules.PIECES.concat(['s','t','u','c','o']);
+ static get PIECES() {
+ return ChessRules.PIECES.concat(["s", "t", "u", "c", "o"]);
}
- setOtherVariables(fen)
- {
+ setOtherVariables(fen) {
super.setOtherVariables(fen);
// Local stack of non-capturing checkered moves:
this.cmoves = [];
const cmove = fen.split(" ")[5];
- if (cmove == "-")
- this.cmoves.push(null);
- else
- {
+ if (cmove == "-") this.cmoves.push(null);
+ else {
this.cmoves.push({
- start: ChessRules.SquareToCoords(cmove.substr(0,2)),
- end: ChessRules.SquareToCoords(cmove.substr(2)),
+ start: ChessRules.SquareToCoords(cmove.substr(0, 2)),
+ end: ChessRules.SquareToCoords(cmove.substr(2))
});
}
}
- static IsGoodFen(fen)
- {
- if (!ChessRules.IsGoodFen(fen))
- return false;
+ static IsGoodFen(fen) {
+ if (!ChessRules.IsGoodFen(fen)) return false;
const fenParts = fen.split(" ");
- if (fenParts.length != 6)
- return false;
+ if (fenParts.length != 6) return false;
if (fenParts[5] != "-" && !fenParts[5].match(/^([a-h][1-8]){2}$/))
return false;
return true;
}
- static IsGoodFlags(flags)
- {
+ static IsGoodFlags(flags) {
// 4 for castle + 16 for pawns
return !!flags.match(/^[01]{20,20}$/);
}
- setFlags(fenflags)
- {
+ setFlags(fenflags) {
super.setFlags(fenflags); //castleFlags
- this.pawnFlags =
- {
- "w": [...Array(8).fill(true)], //pawns can move 2 squares?
- "b": [...Array(8).fill(true)],
+ this.pawnFlags = {
+ w: [...Array(8).fill(true)], //pawns can move 2 squares?
+ b: [...Array(8).fill(true)]
};
- if (!fenflags)
- return;
+ if (!fenflags) return;
const flags = fenflags.substr(4); //skip first 4 digits, for castle
- for (let c of ['w','b'])
- {
- for (let i=0; i<8; i++)
- this.pawnFlags[c][i] = (flags.charAt((c=='w'?0:8)+i) == '1');
+ for (let c of ["w", "b"]) {
+ for (let i = 0; i < 8; i++)
+ this.pawnFlags[c][i] = flags.charAt((c == "w" ? 0 : 8) + i) == "1";
}
}
- aggregateFlags()
- {
+ aggregateFlags() {
return [this.castleFlags, this.pawnFlags];
}
- disaggregateFlags(flags)
- {
+ disaggregateFlags(flags) {
this.castleFlags = flags[0];
this.pawnFlags = flags[1];
}
- getCmove(move)
- {
- if (move.appear[0].c == 'c' && move.vanish.length == 1)
- return {start: move.start, end: move.end};
+ getCmove(move) {
+ if (move.appear[0].c == "c" && move.vanish.length == 1)
+ 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);
+ canTake([x1, y1], [x2, y2]) {
+ const color1 = this.getColor(x1, y1);
+ const color2 = this.getColor(x2, y2);
// Checkered aren't captured
- return color1 != color2 && color2 != 'c' && (color1 != 'c' || color2 != this.turn);
+ return (
+ color1 != color2 &&
+ color2 != "c" &&
+ (color1 != "c" || color2 != this.turn)
+ );
}
// Post-processing: apply "checkerization" of standard moves
- getPotentialMovesFrom([x,y])
- {
- let standardMoves = super.getPotentialMovesFrom([x,y]);
+ getPotentialMovesFrom([x, y]) {
+ let standardMoves = super.getPotentialMovesFrom([x, y]);
const lastRank = this.turn == "w" ? 0 : 7;
- if (this.getPiece(x,y) == V.KING)
- return standardMoves; //king has to be treated differently (for castles)
+ if (this.getPiece(x, y) == V.KING) return standardMoves; //king has to be treated differently (for castles)
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])
+ 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')
- {
+ 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
}
}
- if (m.vanish.length == 1)
- moves.push(m); //no capture
- else
- {
+ if (m.vanish.length == 1) moves.push(m);
+ //no capture
+ else {
// A capture occured (m.vanish.length == 2)
m.appear[0].c = "c";
moves.push(m);
- if (m.appear[0].p != m.vanish[1].p //avoid promotions (already treated):
- && (m.vanish[0].p != V.PAWN || m.end.x != lastRank))
- {
+ if (
+ m.appear[0].p != m.vanish[1].p && //avoid promotions (already treated):
+ (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;
return moves;
}
- canIplay(side, [x,y])
- {
- return (side == this.turn && [side,'c'].includes(this.getColor(x,y)));
+ canIplay(side, [x, y]) {
+ 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 && m2.appear[0].c == 'c'
- && m2.appear.length == 1 && m2.vanish.length == 1
- && m1.start.x == m2.end.x && m1.end.x == m2.start.x
- && m1.start.y == m2.end.y && m1.end.y == m2.start.y);
+ oppositeMoves(m1, m2) {
+ return (
+ !!m1 &&
+ m2.appear[0].c == "c" &&
+ m2.appear.length == 1 &&
+ m2.vanish.length == 1 &&
+ m1.start.x == m2.end.x &&
+ m1.end.x == m2.start.x &&
+ m1.start.y == m2.end.y &&
+ m1.end.y == m2.start.y
+ );
}
- filterValid(moves)
- {
- if (moves.length == 0)
- return [];
+ filterValid(moves) {
+ if (moves.length == 0) return [];
const color = this.turn;
return moves.filter(m => {
const L = this.cmoves.length; //at least 1: init from FEN
- if (this.oppositeMoves(this.cmoves[L-1], m))
- return false;
+ if (this.oppositeMoves(this.cmoves[L - 1], m)) return false;
this.play(m);
const res = !this.underCheck(color);
this.undo(m);
});
}
- 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)
- {
+ 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;
}
}
return false;
}
- underCheck(color)
- {
- return this.isAttacked(this.kingPos[color], [V.GetOppCol(color),'c']);
+ underCheck(color) {
+ return this.isAttacked(this.kingPos[color], [V.GetOppCol(color), "c"]);
}
- getCheckSquares(color)
- {
+ getCheckSquares(color) {
// Artifically change turn, for checkered pawns
this.turn = V.GetOppCol(color);
- const kingAttacked = this.isAttacked(
- this.kingPos[color], [V.GetOppCol(color),'c']);
+ const kingAttacked = this.isAttacked(this.kingPos[color], [
+ V.GetOppCol(color),
+ "c"
+ ]);
let res = kingAttacked
? [JSON.parse(JSON.stringify(this.kingPos[color]))] //need to duplicate!
: [];
return res;
}
- updateVariables(move)
- {
+ updateVariables(move) {
super.updateVariables(move);
// Does this move turn off a 2-squares pawn flag?
- const secondRank = [1,6];
+ const secondRank = [1, 6];
if (secondRank.includes(move.start.x) && move.vanish[0].p == V.PAWN)
- this.pawnFlags[move.start.x==6 ? "w" : "b"][move.start.y] = false;
+ this.pawnFlags[move.start.x == 6 ? "w" : "b"][move.start.y] = false;
}
- getCurrentScore()
- {
- if (this.atLeastOneMove()) // game not over
+ 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")
+ 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;
}
- evalPosition()
- {
+ evalPosition() {
let evaluation = 0;
//Just count material for now, considering checkered neutral (...)
- 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);
- const sign = sqColor == "w" ? 1 : (sqColor=="b" ? -1 : 0);
- evaluation += sign * V.VALUES[this.getPiece(i,j)];
+ 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);
+ const sign = sqColor == "w" ? 1 : sqColor == "b" ? -1 : 0;
+ evaluation += sign * V.VALUES[this.getPiece(i, j)];
}
}
}
return evaluation;
}
- static GenRandInitFen()
- {
+ static GenRandInitFen() {
const randFen = ChessRules.GenRandInitFen();
// Add 16 pawns flags + empty cmove:
return randFen.replace(" w 0 1111", " w 0 11111111111111111111 -");
}
- static ParseFen(fen)
- {
- const fenParsed = ChessRules.ParseFen(fen);
- return Object.assign({},
- ChessRules.ParseFen(fen),
- {cmove: fen.split(" ")[5]});
+ static ParseFen(fen) {
+ return Object.assign({}, ChessRules.ParseFen(fen), {
+ cmove: fen.split(" ")[5]
+ });
}
- getFen()
- {
+ getFen() {
const L = this.cmoves.length;
- const cmoveFen = (!this.cmoves[L-1]
+ const cmoveFen = !this.cmoves[L - 1]
? "-"
- : ChessRules.CoordsToSquare(this.cmoves[L-1].start)
- + ChessRules.CoordsToSquare(this.cmoves[L-1].end));
+ : ChessRules.CoordsToSquare(this.cmoves[L - 1].start) +
+ ChessRules.CoordsToSquare(this.cmoves[L - 1].end);
return super.getFen() + " " + cmoveFen;
}
- getFlagsFen()
- {
+ 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;
}
// TODO (design): this cmove update here or in (un)updateVariables ?
- play(move)
- {
- this.cmoves.push( this.getCmove(move) );
+ play(move) {
+ this.cmoves.push(this.getCmove(move));
super.play(move);
}
- undo(move)
- {
+ undo(move) {
this.cmoves.pop();
super.undo(move);
}
- getNotation(move)
- {
- if (move.appear.length == 2)
- {
+ getNotation(move) {
+ if (move.appear.length == 2) {
// Castle
- if (move.end.y < move.start.y)
- return "0-0-0";
- else
- return "0-0";
+ 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);
- if (piece == V.PAWN)
- {
+ if (piece == V.PAWN) {
// Pawn move
let notation = "";
- if (move.vanish.length > 1)
- {
+ if (move.vanish.length > 1) {
// Capture
const startColumn = V.CoordToColumn(move.start.y);
- notation = startColumn + "x" + finalSquare +
- "=" + move.appear[0].p.toUpperCase();
- }
- else //no capture
- {
+ 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
+ if (move.appear.length > 0 && piece != move.appear[0].p)
+ //promotion
notation += "=" + move.appear[0].p.toUpperCase();
}
return notation;
}
-
- else
- {
- // Piece movement
- return piece.toUpperCase() + (move.vanish.length > 1 ? "x" : "") + finalSquare
- + (move.vanish.length > 1 ? "=" + move.appear[0].p.toUpperCase() : "");
- }
+ // Piece movement
+ return (
+ piece.toUpperCase() +
+ (move.vanish.length > 1 ? "x" : "") +
+ finalSquare +
+ (move.vanish.length > 1 ? "=" + move.appear[0].p.toUpperCase() : "")
+ );
}
-}
+};
projects / vchess.git / blobdiff