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