client/src/variants/Crazyhouse.js

   1 import { ChessRules, PiPo, Move } from "@/base_rules";
   2 import { ArrayFun } from "@/utils/array";
   3
   4 export class CrazyhouseRules extends ChessRules {
   5
   6   static IsGoodFen(fen) {
   7     if (!ChessRules.IsGoodFen(fen)) return false;
   8     const fenParsed = V.ParseFen(fen);
   9     // 5) Check reserves
  10     if (!fenParsed.reserve || !fenParsed.reserve.match(/^[0-9]{10,10}$/))
  11       return false;
  12     // 6) Check promoted array
  13     if (!fenParsed.promoted) return false;
  14     if (fenParsed.promoted == "-") return true; //no promoted piece on board
  15     const squares = fenParsed.promoted.split(",");
  16     for (let square of squares) {
  17       const c = V.SquareToCoords(square);
  18       if (c.y < 0 || c.y > V.size.y || isNaN(c.x) || c.x < 0 || c.x > V.size.x)
  19         return false;
  20     }
  21     return true;
  22   }
  23
  24   static ParseFen(fen) {
  25     const fenParts = fen.split(" ");
  26     return Object.assign(
  27       ChessRules.ParseFen(fen),
  28       {
  29         reserve: fenParts[5],
  30         promoted: fenParts[6]
  31       }
  32     );
  33   }
  34
  35   static GenRandInitFen(randomness) {
  36     return ChessRules.GenRandInitFen(randomness) + " 0000000000 -";
  37   }
  38
  39   getFen() {
  40     return (
  41       super.getFen() + " " +
  42       this.getReserveFen() + " " +
  43       this.getPromotedFen()
  44     );
  45   }
  46
  47   getFenForRepeat() {
  48     return (
  49       super.getFenForRepeat() + "_" +
  50       this.getReserveFen() + "_" +
  51       this.getPromotedFen()
  52     );
  53   }
  54
  55   getReserveFen() {
  56     let counts = new Array(10);
  57     for (
  58       let i = 0;
  59       i < V.PIECES.length - 1;
  60       i++ //-1: no king reserve
  61     ) {
  62       counts[i] = this.reserve["w"][V.PIECES[i]];
  63       counts[5 + i] = this.reserve["b"][V.PIECES[i]];
  64     }
  65     return counts.join("");
  66   }
  67
  68   getPromotedFen() {
  69     let res = "";
  70     for (let i = 0; i < V.size.x; i++) {
  71       for (let j = 0; j < V.size.y; j++) {
  72         if (this.promoted[i][j]) res += V.CoordsToSquare({ x: i, y: j }) + ",";
  73       }
  74     }
  75     // Remove last comma:
  76     if (res.length > 0) res = res.slice(0, -1);
  77     else res = "-";
  78     return res;
  79   }
  80
  81   setOtherVariables(fen) {
  82     super.setOtherVariables(fen);
  83     // Also init reserves (used by the interface to show landable pieces)
  84     const reserve =
  85       V.ParseFen(fen).reserve.split("").map(x => parseInt(x, 10));
  86     this.reserve = {
  87       w: {
  88         [V.PAWN]: reserve[0],
  89         [V.ROOK]: reserve[1],
  90         [V.KNIGHT]: reserve[2],
  91         [V.BISHOP]: reserve[3],
  92         [V.QUEEN]: reserve[4]
  93       },
  94       b: {
  95         [V.PAWN]: reserve[5],
  96         [V.ROOK]: reserve[6],
  97         [V.KNIGHT]: reserve[7],
  98         [V.BISHOP]: reserve[8],
  99         [V.QUEEN]: reserve[9]
 100       }
 101     };
 102     this.promoted = ArrayFun.init(V.size.x, V.size.y, false);
 103     if (fenParsed.promoted != "-") {
 104       for (let square of fenParsed.promoted.split(",")) {
 105         const coords = V.SquareToCoords(square);
 106         this.promoted[coords.x][coords.y] = true;
 107       }
 108     }
 109   }
 110
 111   getColor(i, j) {
 112     if (i >= V.size.x) return i == V.size.x ? "w" : "b";
 113     return this.board[i][j].charAt(0);
 114   }
 115
 116   getPiece(i, j) {
 117     if (i >= V.size.x) return V.RESERVE_PIECES[j];
 118     return this.board[i][j].charAt(1);
 119   }
 120
 121   // Used by the interface:
 122   getReservePpath(index, color) {
 123     return color + V.RESERVE_PIECES[index];
 124   }
 125 //  // Version if some day I have pieces with numbers printed on it:
 126 //  getReservePpath(index, color) {
 127 //    return (
 128 //      "Crazyhouse/" +
 129 //      color + V.RESERVE_PIECES[index] +
 130 //      "_" + this.vr.reserve[playingColor][V.RESERVE_PIECES[i]]
 131 //    );
 132 //  }
 133
 134   // Ordering on reserve pieces
 135   static get RESERVE_PIECES() {
 136     return [V.PAWN, V.ROOK, V.KNIGHT, V.BISHOP, V.QUEEN];
 137   }
 138
 139   getReserveMoves([x, y]) {
 140     const color = this.turn;
 141     const p = V.RESERVE_PIECES[y];
 142     if (this.reserve[color][p] == 0) return [];
 143     let moves = [];
 144     const pawnShift = p == V.PAWN ? 1 : 0;
 145     for (let i = pawnShift; i < V.size.x - pawnShift; i++) {
 146       for (let j = 0; j < V.size.y; j++) {
 147         if (this.board[i][j] == V.EMPTY) {
 148           let mv = new Move({
 149             appear: [
 150               new PiPo({
 151                 x: i,
 152                 y: j,
 153                 c: color,
 154                 p: p
 155               })
 156             ],
 157             vanish: [],
 158             start: { x: x, y: y }, //a bit artificial...
 159             end: { x: i, y: j }
 160           });
 161           moves.push(mv);
 162         }
 163       }
 164     }
 165     return moves;
 166   }
 167
 168   getPotentialMovesFrom([x, y]) {
 169     if (x >= V.size.x)
 170       // Reserves, outside of board: x == sizeX(+1)
 171       return this.getReserveMoves([x, y]);
 172     // Standard moves
 173     return super.getPotentialMovesFrom([x, y]);
 174   }
 175
 176   getAllValidMoves() {
 177     let moves = super.getAllPotentialMoves();
 178     const color = this.turn;
 179     for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 180       moves = moves.concat(
 181         this.getReserveMoves([V.size.x + (color == "w" ? 0 : 1), i])
 182       );
 183     }
 184     return this.filterValid(moves);
 185   }
 186
 187   atLeastOneMove() {
 188     if (!super.atLeastOneMove()) {
 189       // Search one reserve move
 190       for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 191         let moves = this.filterValid(
 192           this.getReserveMoves([V.size.x + (this.turn == "w" ? 0 : 1), i])
 193         );
 194         if (moves.length > 0) return true;
 195       }
 196       return false;
 197     }
 198     return true;
 199   }
 200
 201   postPlay(move) {
 202     super.postPlay(move);
 203     // Skip castle:
 204     if (move.vanish.length == 2 && move.appear.length == 2) return;
 205     const color = move.appear[0].c;
 206     if (move.vanish.length == 0) {
 207       this.reserve[color][move.appear[0].p]--;
 208       return;
 209     }
 210     move.movePromoted = this.promoted[move.start.x][move.start.y];
 211     move.capturePromoted = this.promoted[move.end.x][move.end.y];
 212     this.promoted[move.start.x][move.start.y] = false;
 213     this.promoted[move.end.x][move.end.y] =
 214       move.movePromoted ||
 215       (move.vanish[0].p == V.PAWN && move.appear[0].p != V.PAWN);
 216     if (move.capturePromoted) this.reserve[color][V.PAWN]++;
 217     else if (move.vanish.length == 2) this.reserve[color][move.vanish[1].p]++;
 218   }
 219
 220   postUndo(move) {
 221     super.postUndo(move);
 222     if (move.vanish.length == 2 && move.appear.length == 2) return;
 223     const color = this.turn;
 224     if (move.vanish.length == 0) {
 225       this.reserve[color][move.appear[0].p]++;
 226       return;
 227     }
 228     if (move.movePromoted) this.promoted[move.start.x][move.start.y] = true;
 229     this.promoted[move.end.x][move.end.y] = move.capturePromoted;
 230     if (move.capturePromoted) this.reserve[color][V.PAWN]--;
 231     else if (move.vanish.length == 2) this.reserve[color][move.vanish[1].p]--;
 232   }
 233
 234   static get SEARCH_DEPTH() {
 235     return 2;
 236   }
 237
 238   evalPosition() {
 239     let evaluation = super.evalPosition();
 240     // Add reserves:
 241     for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 242       const p = V.RESERVE_PIECES[i];
 243       evaluation += this.reserve["w"][p] * V.VALUES[p];
 244       evaluation -= this.reserve["b"][p] * V.VALUES[p];
 245     }
 246     return evaluation;
 247   }
 248
 249   getNotation(move) {
 250     if (move.vanish.length > 0) return super.getNotation(move);
 251     // Rebirth:
 252     const piece =
 253       move.appear[0].p != V.PAWN ? move.appear[0].p.toUpperCase() : "";
 254     return piece + "@" + V.CoordsToSquare(move.end);
 255   }
 256
 257 };