x: (ex + sx) / 2,
y: (move.end.y + sy) / 2
},
+ // The arrival column must be remembered, because
+ // potentially two pawns could be candidates to be captured:
+ // one on our left, and one on our right.
move.end.y
];
}
return undefined; //default
}
+ static IsGoodEnpassant(enpassant) {
+ if (enpassant != "-") {
+ const epParts = enpassant.split(",");
+ const epSq = V.SquareToCoords(epParts[0]);
+ if (isNaN(epSq.x) || isNaN(epSq.y) || !V.OnBoard(epSq)) return false;
+ const arrCol = V.ColumnToCoord(epParts[1]);
+ if (isNaN(arrCol) || arrCol < 0 || arrCol >= V.size.y) return false;
+ }
+ return true;
+ }
+
+ getEnpassantFen() {
+ const L = this.epSquares.length;
+ if (!this.epSquares[L - 1]) return "-"; //no en-passant
+ return (
+ V.CoordsToSquare(this.epSquares[L - 1][0]) +
+ "," +
+ V.CoordToColumn(this.epSquares[L - 1][1])
+ );
+ }
+
// Special pawns movements
getPotentialPawnMoves([x, y]) {
const color = this.turn;
if (
!!epSquare &&
epSquare[0].x == x + shiftX &&
- epSquare[0].y == y &&
- Math.abs(epSquare[1] - y) == 1
+ epSquare[0].y == y
) {
let enpassantMove = this.getBasicMove([x, y], [x + shiftX, y]);
enpassantMove.vanish.push({
return moves;
}
- isAttackedByPawn([x, y], colors) {
- for (let c of colors) {
- let pawnShift = c == "w" ? 1 : -1;
- if (x + pawnShift >= 0 && x + pawnShift < V.size.x) {
- if (
- this.getPiece(x + pawnShift, y) == V.PAWN &&
- this.getColor(x + pawnShift, y) == c
- ) {
- return true;
- }
+ isAttackedByPawn([x, y], color) {
+ let pawnShift = (color == "w" ? 1 : -1);
+ if (x + pawnShift >= 0 && x + pawnShift < V.size.x) {
+ if (
+ this.getPiece(x + pawnShift, y) == V.PAWN &&
+ this.getColor(x + pawnShift, y) == color
+ ) {
+ return true;
}
}
return false;
notation = startSquare + finalSquare;
}
if (move.appear[0].p != V.PAWN)
- //promotion
+ // Promotion
notation += "=" + move.appear[0].p.toUpperCase();
return notation;
}