end: ChessRules.SquareToCoords(umove.substr(2))
});
}
+ // Local stack of positions to avoid redundant moves:
+ this.repetitions = [];
}
static IsGoodFen(fen) {
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) {
}
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);
}
for (let i = mvArray.length - 1; i >= 0; i--) this.undo(mvArray[i]);
if (!mv.end.released) return (mvArray.length > 1 ? mvArray : mvArray[0]);
}
+ return null; //never reached
}
// NOTE: evalPosition() is wrong, but unused since bot plays at random
// 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] &&