+import { ChessRules, Move, PiPo } from "@/base_rules";
+import { Cannibal1Rules } from "@/variants/Cannibal1";
+
+export class Cannibal2Rules extends Cannibal1Rules {
+
+ // Trim all non-capturing moves
+ static KeepCaptures(moves) {
+ return moves.filter(m => m.vanish.length == 2 && m.appear.length == 1);
+ }
+
+ // Stop at the first capture found (if any)
+ atLeastOneCapture() {
+ 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++) {
+ if (
+ this.board[i][j] != V.EMPTY &&
+ this.getColor(i, j) != oppCol &&
+ this.filterValid(this.getPotentialMovesFrom([i, j])).some(m =>
+ // Warning: discard castle moves
+ m.vanish.length == 2 && m.appear.length == 1)
+ ) {
+ return true;
+ }
+ }
+ }
+ return false;
+ }
+
+ addPawnMoves([x1, y1], [x2, y2], moves) {
+ let finalPieces = [V.PAWN];
+ const color = this.turn;
+ const lastRank = (color == "w" ? 0 : V.size.x - 1);
+ if (x2 == lastRank) {
+ if (this.board[x2][y2] != V.EMPTY)
+ // Cannibal rules: no choice if capture
+ finalPieces = [this.getPiece(x2, y2)];
+ else finalPieces = V.PawnSpecs.promotions;
+ }
+ let tr = null;
+ for (let piece of finalPieces) {
+ tr = (piece != V.PAWN ? { c: color, p: piece } : null);
+ moves.push(this.getBasicMove([x1, y1], [x2, y2], tr));
+ }
+ }
+
+ getPossibleMovesFrom(sq) {
+ let moves = this.filterValid(this.getPotentialMovesFrom(sq));
+ const captureMoves = V.KeepCaptures(moves);
+ if (captureMoves.length > 0) return captureMoves;
+ if (this.atLeastOneCapture()) return [];
+ return moves;
+ }
+
+ getAllValidMoves() {
+ const moves = super.getAllValidMoves();
+ if (moves.some(m => m.vanish.length == 2 && m.appear.length == 1))
+ return V.KeepCaptures(moves);
+ return moves;
+ }
+
+};
projects / vchess.git / commitdiff