x: ['b', 'k'],
y: ['q', 'q'],
z: ['q', 'k'],
- '_': ['k', 'k']
+ '@': ['k', 'k']
};
}
static fen2board(f) {
- // Underscore is character 95, in file w_
- return f.charCodeAt() <= 95 ? "w" + f.toLowerCase() : "b" + f;
+ // Arobase is character 64
+ return f.charCodeAt() <= 90 ? "w" + f.toLowerCase() : "b" + f;
}
static IsGoodPosition(position) {
if (position.length == 0) return false;
const rows = position.split("/");
if (rows.length != V.size.x) return false;
- let kingSymb = ['k', 'g', 'm', 'u', 'x', 'z', '_'];
+ let kingSymb = ['k', 'g', 'm', 'u', 'x', 'z', '@'];
let kings = { 'k': 0, 'K': 0 };
for (let row of rows) {
let sumElts = 0;
for (let i = 0; i < row.length; i++) {
- if (!!(row[i].toLowerCase().match(/[a-z_]/))) {
+ if (!!(row[i].toLowerCase().match(/[a-z@]/))) {
sumElts++;
if (kingSymb.includes(row[i])) kings['k']++;
// Not "else if", if two kings dancing together
this.kingPos = { w: [-1, -1], b: [-1, -1] };
const fenRows = V.ParseFen(fen).position.split("/");
const startRow = { 'w': V.size.x - 1, 'b': 0 };
- const kingSymb = ['k', 'g', 'm', 'u', 'x', 'z', '_'];
+ const kingSymb = ['k', 'g', 'm', 'u', 'x', 'z', '@'];
for (let i = 0; i < fenRows.length; i++) {
let k = 0;
for (let j = 0; j < fenRows[i].length; j++) {
const c = fenRows[i].charAt(j);
- if (!!(c.toLowerCase().match(/[a-z_]/))) {
+ if (!!(c.toLowerCase().match(/[a-z@]/))) {
if (kingSymb.includes(c))
this.kingPos["b"] = [i, k];
// Not "else if", in case of two kings dancing together
end: ChessRules.SquareToCoords(umove.substr(2))
});
}
+ // Local stack of positions to avoid redundant moves:
+ this.repetitions = [];
}
static IsGoodFen(fen) {
);
}
- static GenRandInitFen(randomness) {
+ static GenRandInitFen(options) {
// Add 16 pawns flags + empty umove:
- return ChessRules.GenRandInitFen(randomness)
+ return ChessRules.GenRandInitFen(options)
.slice(0, -2) + "1111111111111111 - -";
}
}
let baseMoves = [];
const c = this.turn;
- switch (piece || this.getPiece(x, y)) {
+ switch (piece) {
case V.PAWN: {
const firstRank = (c == 'w' ? 7 : 0);
baseMoves = this.getPotentialPawnMoves([x, y]).filter(m => {
getCheckSquares() {
return [];
}
+
filterValid(moves) {
if (moves.length == 0) return [];
const L = this.umoves.length; //at least 1: init from FEN
- return moves.filter(m => !this.oppositeMoves(this.umoves[L - 1], m));
+ return moves.filter(m => {
+ if (this.oppositeMoves(this.umoves[L - 1], m)) return false;
+ if (!m.end.released) return true;
+ // Check for repetitions:
+ V.PlayOnBoard(this.board, m);
+ const newState = {
+ piece: m.end.released,
+ square: { x: m.end.x, y: m.end.y },
+ position: this.getBaseFen()
+ };
+ const repet =
+ this.repetitions.some(r => {
+ return (
+ r.piece == newState.piece &&
+ (
+ r.square.x == newState.square.x &&
+ r.square.y == newState.square.y
+ ) &&
+ r.position == newState.position
+ );
+ });
+ V.UndoOnBoard(this.board, m);
+ return !repet;
+ });
}
updateCastleFlags(move, piece) {
// NOTE: lm.p != V.KING, always.
const piece =
!!lm
- ? lm.p :
- this.getPiece(move.vanish[0].x, move.vanish[0].y);
+ ? lm.p
+ : this.getPiece(move.vanish[0].x, move.vanish[0].y);
if (piece == V.KING)
this.kingPos[c] = [move.appear[0].x, move.appear[0].y];
this.updateCastleFlags(move, piece);
}
V.PlayOnBoard(this.board, move);
this.umoves.push(this.getUmove(move));
+ if (!move.end.released) this.repetitions = [];
+ else {
+ this.repetitions.push(
+ {
+ piece: move.end.released,
+ square: { x: move.end.x, y: move.end.y },
+ position: this.getBaseFen()
+ }
+ );
+ }
}
undo(move) {
this.movesCount--;
}
this.umoves.pop();
+ if (!!move.end.released) this.repetitions.pop();
this.postUndo(move);
}
// Add potential promotion indications:
const firstLastRank = (c == 'w' ? [7, 0] : [0, 7]);
if (move.end.x == firstLastRank[1] && piece == V.PAWN) {
- const up = this.getUnionPieces(move.appear[0].c, move.appear[0].p);
- notation += "=" + up[c].toUpperCase();
+ notation += "=";
+ if (ChessRules.PIECES.includes(move.appear[0].p))
+ notation += move.appear[0].p.toUpperCase();
+ else {
+ const up = this.getUnionPieces(move.appear[0].c, move.appear[0].p);
+ notation += up[c].toUpperCase();
+ }
}
else if (
move.end.x == firstLastRank[0] &&