--- /dev/null
+import { ChessRules } from "@/base_rules";
+import { ArrayFun } from "@/utils/array";
+import { randInt } from "@/utils/alea";
+
+export const VariantRules = class Antiking1Rules extends ChessRules {
+ static get HasEnpassant() {
+ return false;
+ }
+
+ static get HasCastle() {
+ return false;
+ }
+
+ static get ANTIKING() {
+ return "a";
+ }
+
+ static get PIECES() {
+ return ChessRules.PIECES.concat([V.ANTIKING]);
+ }
+
+ getPpath(b) {
+ return b[1] == "a" ? "Antiking/" + b : b;
+ }
+
+ setOtherVariables(fen) {
+ super.setOtherVariables(fen);
+ this.antikingPos = { w: [-1, -1], b: [-1, -1] };
+ const rows = V.ParseFen(fen).position.split("/");
+ for (let i = 0; i < rows.length; i++) {
+ let k = 0;
+ for (let j = 0; j < rows[i].length; j++) {
+ switch (rows[i].charAt(j)) {
+ case "a":
+ this.antikingPos["b"] = [i, k];
+ break;
+ case "A":
+ this.antikingPos["w"] = [i, k];
+ break;
+ default: {
+ const num = parseInt(rows[i].charAt(j));
+ if (!isNaN(num)) k += num - 1;
+ }
+ }
+ k++;
+ }
+ }
+ }
+
+ // (Anti)King flags at 1 (true) if they can knight-jump
+ setFlags(fenflags) {
+ this.kingFlags = {
+ // King then antiking
+ w: [...Array(2).fill(false)],
+ b: [...Array(2).fill(false)]
+ };
+ for (let c of ["w", "b"]) {
+ for (let i = 0; i < 2; i++)
+ this.kingFlags[c][i] = fenflags.charAt((c == "w" ? 0 : 2) + i) == "1";
+ }
+ }
+
+ aggregateFlags() {
+ return this.kingFlags;
+ }
+
+ disaggregateFlags(flags) {
+ this.kingFlags = flags;
+ }
+
+ getFlagsFen() {
+ // Return kings flags
+ let flags = "";
+ for (let c of ["w", "b"]) {
+ for (let i = 0; i < 2; i++) flags += this.kingFlags[c][i] ? "1" : "0";
+ }
+ return flags;
+ }
+
+ canTake([x1, y1], [x2, y2]) {
+ const piece1 = this.getPiece(x1, y1);
+ const piece2 = this.getPiece(x2, y2);
+ const color1 = this.getColor(x1, y1);
+ const color2 = this.getColor(x2, y2);
+ return (
+ piece2 != "a" &&
+ ((piece1 != "a" && color1 != color2) ||
+ (piece1 == "a" && color1 == color2))
+ );
+ }
+
+ getPotentialMovesFrom([x, y]) {
+ let moves = [];
+ let addKnightJumps = false;
+ const piece = this.getPiece(x, y);
+ const color = this.getColor(x, y);
+ if (piece == V.ANTIKING) {
+ moves = this.getPotentialAntikingMoves([x, y]);
+ addKnightJumps = this.kingFlags[color][1];
+ } else {
+ moves = super.getPotentialMovesFrom([x, y]);
+ if (piece == V.KING) addKnightJumps = this.kingFlags[color][0];
+ }
+ if (addKnightJumps) {
+ // Add potential knight jump to (anti)kings
+ const knightJumps = super.getPotentialKnightMoves([x, y]);
+ // Remove captures (TODO: could be done more efficiently...)
+ moves = moves.concat(knightJumps.filter(m => m.vanish.length == 1));
+ }
+ return moves;
+ }
+
+ getPotentialPawnMoves([x, y]) {
+ const color = this.turn;
+ let moves = [];
+ const [sizeX, sizeY] = [V.size.x, V.size.y];
+ const shiftX = color == "w" ? -1 : 1;
+ const startRank = color == "w" ? sizeX - 2 : 1;
+ const lastRank = color == "w" ? 0 : sizeX - 1;
+ const finalPieces =
+ x + shiftX == lastRank ? [V.ROOK, V.KNIGHT, V.BISHOP, V.QUEEN] : [V.PAWN];
+
+ // One square diagonally
+ for (let shiftY of [-1, 1]) {
+ if (this.board[x + shiftX][y + shiftY] == V.EMPTY) {
+ for (let piece of finalPieces) {
+ moves.push(
+ this.getBasicMove([x, y], [x + shiftX, y + shiftY], {
+ c: color,
+ p: piece
+ })
+ );
+ }
+ }
+ }
+ // Capture
+ if (
+ this.board[x + shiftX][y] != V.EMPTY &&
+ this.canTake([x, y], [x + shiftX, y])
+ ) {
+ for (let piece of finalPieces)
+ moves.push(
+ this.getBasicMove([x, y], [x + shiftX, y], { c: color, p: piece })
+ );
+ }
+
+ return moves;
+ }
+
+ getPotentialAntikingMoves(sq) {
+ // The antiking moves like a king (only captured colors differ)
+ return this.getSlideNJumpMoves(
+ sq,
+ V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
+ "oneStep"
+ );
+ }
+
+ isAttacked(sq, color) {
+ return (
+ super.isAttacked(sq, color) ||
+ this.isAttackedByAntiking(sq, color)
+ );
+ }
+
+ 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;
+ }
+
+ isAttackedByKing([x, y], color) {
+ // Antiking is not attacked by king:
+ if (this.getPiece(x, y) == V.ANTIKING) return false;
+ return this.isAttackedBySlideNJump(
+ [x, y],
+ color,
+ V.KING,
+ V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
+ "oneStep"
+ );
+ }
+
+ isAttackedByAntiking([x, y], color) {
+ // (Anti)King is not attacked by antiking
+ if ([V.KING, V.ANTIKING].includes(this.getPiece(x, y))) return false;
+ return this.isAttackedBySlideNJump(
+ [x, y],
+ color,
+ V.ANTIKING,
+ V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
+ "oneStep"
+ );
+ }
+
+ underCheck(color) {
+ const oppCol = V.GetOppCol(color);
+ let res =
+ this.isAttacked(this.kingPos[color], oppCol) ||
+ !this.isAttacked(this.antikingPos[color], oppCol);
+ return res;
+ }
+
+ getCheckSquares(color) {
+ let res = [];
+ const oppCol = V.GetOppCol(color);
+ if (this.isAttacked(this.kingPos[color], oppCol))
+ res.push(JSON.parse(JSON.stringify(this.kingPos[color])));
+ if (!this.isAttacked(this.antikingPos[color], oppCol))
+ res.push(JSON.parse(JSON.stringify(this.antikingPos[color])));
+ return res;
+ }
+
+ postPlay(move) {
+ super.postPlay(move);
+ const piece = move.vanish[0].p;
+ const c = move.vanish[0].c;
+ // Update antiking position, and kings flags
+ if (piece == V.ANTIKING) {
+ this.antikingPos[c][0] = move.appear[0].x;
+ this.antikingPos[c][1] = move.appear[0].y;
+ this.kingFlags[c][1] = false;
+ } else if (piece == V.KING) this.kingFlags[c][0] = false;
+ }
+
+ postUndo(move) {
+ super.postUndo(move);
+ const c = move.vanish[0].c;
+ if (move.vanish[0].p == V.ANTIKING)
+ this.antikingPos[c] = [move.start.x, move.start.y];
+ }
+
+ getCurrentScore() {
+ if (this.atLeastOneMove())
+ return "*";
+
+ const color = this.turn;
+ const oppCol = V.GetOppCol(color);
+ if (
+ !this.isAttacked(this.kingPos[color], oppCol) &&
+ this.isAttacked(this.antikingPos[color], oppCol)
+ ) {
+ return "1/2";
+ }
+ return color == "w" ? "0-1" : "1-0";
+ }
+
+ static get VALUES() {
+ return Object.assign(
+ { a: 1000 },
+ ChessRules.VALUES
+ );
+ }
+
+ static GenRandInitFen() {
+ // Always deterministic setup
+ return "2prbkqA/2p1nnbr/2pppppp/8/8/PPPPPP2/RBNN1P2/aQKBRP2 w 0 1111";
+ }
+
+ static get SEARCH_DEPTH() {
+ return 2;
+ }
+};
projects / vchess.git / blobdiff