+import { ChessRules } from "@/base_rules";
+import { ArrayFun } from "@/utils/array";
+import { shuffle } from "@/utils/alea";
+
+export class DiamondRules extends ChessRules {
+ static get HasFlags() {
+ return false;
+ }
+
+ static get HasEnpassant() {
+ return false;
+ }
+
+ static GenRandInitFen(randomness) {
+ if (randomness == 0)
+ return "krbp4/rqnp4/nbpp4/pppp4/4PPPP/4PPBN/4PNQR/4PBRK w 0";
+ let pieces = { w: new Array(8), b: new Array(8) };
+ for (let c of ["w", "b"]) {
+ if (c == 'b' && randomness == 1) {
+ pieces['b'] = pieces['w'];
+ break;
+ }
+ // Get random squares for every piece, totally freely
+ let positions = shuffle(ArrayFun.range(8));
+ const composition = ['b', 'b', 'r', 'r', 'n', 'n', 'k', 'q'];
+ const rem2 = positions[0] % 2;
+ if (rem2 == positions[1] % 2) {
+ // Fix bishops (on different colors)
+ for (let i=2; i<8; i++) {
+ if (positions[i] % 2 != rem2)
+ [positions[1], positions[i]] = [positions[i], positions[1]];
+ }
+ }
+ for (let i = 0; i < 8; i++) pieces[c][positions[i]] = composition[i];
+ }
+ return (
+ pieces["b"].slice(0, 3).join("") + "p4/" +
+ pieces["b"].slice(3, 6).join("") + "p4/" +
+ pieces["b"].slice(6, 8).join("") + "pp4/" +
+ "pppp4/4PPPP/" +
+ "4PP" + pieces["w"].slice(6, 8).reverse().join("").toUpperCase() + "/" +
+ "4P" + pieces["w"].slice(3, 6).reverse().join("").toUpperCase() + "/" +
+ "4P" + pieces["w"].slice(0, 3).reverse().join("").toUpperCase() +
+ " w 0"
+ );
+ }
+
+ // Special pawns movements
+ getPotentialPawnMoves([x, y]) {
+ const color = this.turn;
+ let moves = [];
+ const [sizeX, sizeY] = [V.size.x, V.size.y];
+ const shift = (color == "w" ? -1 : 1);
+ const lastRank = (color == "w" ? 0 : 7);
+
+ // One square forward (diagonally along h1-a8)
+ if (this.board[x + shift][y + shift] == V.EMPTY) {
+ const finalPieces =
+ [x + shift, y + shift].includes(lastRank)
+ ? [V.ROOK, V.KNIGHT, V.BISHOP, V.QUEEN]
+ : [V.PAWN];
+ for (let piece of finalPieces) {
+ moves.push(
+ this.getBasicMove(
+ [x, y], [x + shift, y + shift], { c: color, p: piece })
+ );
+ }
+ }
+ // Capture
+ for (let pShift of [[0, shift], [shift, 0]]) {
+ if (
+ this.board[x + pShift[0]][y + pShift[1]] != V.EMPTY &&
+ this.canTake([x, y], [x + pShift[0], y + pShift[1]])
+ ) {
+ const finalPieces =
+ [x + pShift[0], y + pShift[1]].includes(lastRank)
+ ? [V.ROOK, V.KNIGHT, V.BISHOP, V.QUEEN]
+ : [V.PAWN];
+ for (let piece of finalPieces) {
+ moves.push(
+ this.getBasicMove(
+ [x, y],
+ [x + pShift[0], y + pShift[1]],
+ {
+ c: color,
+ p: piece
+ }
+ )
+ );
+ }
+ }
+ }
+
+ return moves;
+ }
+
+ isAttackedByPawn([x, y], color) {
+ let pawnShift = (color == "w" ? 1 : -1);
+ return (
+ (
+ x + pawnShift >= 0 && x + pawnShift < V.size.x &&
+ this.getPiece(x + pawnShift, y) == V.PAWN &&
+ this.getColor(x + pawnShift, y) == color
+ )
+ ||
+ (
+ y + pawnShift >= 0 && y + pawnShift < V.size.y &&
+ this.getPiece(x, y + pawnShift) == V.PAWN &&
+ this.getColor(x, y + pawnShift) == color
+ )
+ );
+ }
+
+ static get SEARCH_DEPTH() {
+ return 2;
+ }
+
+ getNotation(move) {
+ const piece = this.getPiece(move.start.x, move.start.y);
+ if (piece == V.PAWN) {
+ // Pawn move
+ const finalSquare = V.CoordsToSquare(move.end);
+ let notation = "";
+ if (move.vanish.length == 2)
+ // Capture
+ notation = "Px" + finalSquare;
+ else {
+ // No capture: indicate the initial square for potential ambiguity
+ const startSquare = V.CoordsToSquare(move.start);
+ notation = startSquare + finalSquare;
+ }
+ if (move.appear[0].p != V.PAWN)
+ // Promotion
+ notation += "=" + move.appear[0].p.toUpperCase();
+ return notation;
+ }
+ return super.getNotation(move); //all other pieces are orthodox
+ }
+};
projects / vchess.git / commitdiff