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   getEpSquare(moveOrSquare) {
  35     if (typeof moveOrSquare !== "object" || moveOrSquare.vanish.length > 0)
  36       return super.getEpSquare(moveOrSquare);
  37     // Landing move: no en-passant
  38     return undefined;
  39   }
  40
  41   static GenRandInitFen(randomness) {
  42     return ChessRules.GenRandInitFen(randomness) + " 0000000000 -";
  43   }
  44
  45   getFen() {
  46     return (
  47       super.getFen() + " " +
  48       this.getReserveFen() + " " +
  49       this.getPromotedFen()
  50     );
  51   }
  52
  53   getFenForRepeat() {
  54     return (
  55       super.getFenForRepeat() + "_" +
  56       this.getReserveFen() + "_" +
  57       this.getPromotedFen()
  58     );
  59   }
  60
  61   getReserveFen() {
  62     let counts = new Array(10);
  63     for (
  64       let i = 0;
  65       i < V.PIECES.length - 1;
  66       i++ //-1: no king reserve
  67     ) {
  68       counts[i] = this.reserve["w"][V.PIECES[i]];
  69       counts[5 + i] = this.reserve["b"][V.PIECES[i]];
  70     }
  71     return counts.join("");
  72   }
  73
  74   getPromotedFen() {
  75     let res = "";
  76     for (let i = 0; i < V.size.x; i++) {
  77       for (let j = 0; j < V.size.y; j++) {
  78         if (this.promoted[i][j]) res += V.CoordsToSquare({ x: i, y: j }) + ",";
  79       }
  80     }
  81     // Remove last comma:
  82     if (res.length > 0) res = res.slice(0, -1);
  83     else res = "-";
  84     return res;
  85   }
  86
  87   setOtherVariables(fen) {
  88     super.setOtherVariables(fen);
  89     const fenParsed = V.ParseFen(fen);
  90     // Also init reserves (used by the interface to show landable pieces)
  91     this.reserve = {
  92       w: {
  93         [V.PAWN]: parseInt(fenParsed.reserve[0]),
  94         [V.ROOK]: parseInt(fenParsed.reserve[1]),
  95         [V.KNIGHT]: parseInt(fenParsed.reserve[2]),
  96         [V.BISHOP]: parseInt(fenParsed.reserve[3]),
  97         [V.QUEEN]: parseInt(fenParsed.reserve[4])
  98       },
  99       b: {
 100         [V.PAWN]: parseInt(fenParsed.reserve[5]),
 101         [V.ROOK]: parseInt(fenParsed.reserve[6]),
 102         [V.KNIGHT]: parseInt(fenParsed.reserve[7]),
 103         [V.BISHOP]: parseInt(fenParsed.reserve[8]),
 104         [V.QUEEN]: parseInt(fenParsed.reserve[9])
 105       }
 106     };
 107     this.promoted = ArrayFun.init(V.size.x, V.size.y, false);
 108     if (fenParsed.promoted != "-") {
 109       for (let square of fenParsed.promoted.split(",")) {
 110         const coords = V.SquareToCoords(square);
 111         this.promoted[coords.x][coords.y] = true;
 112       }
 113     }
 114   }
 115
 116   getColor(i, j) {
 117     if (i >= V.size.x) return i == V.size.x ? "w" : "b";
 118     return this.board[i][j].charAt(0);
 119   }
 120
 121   getPiece(i, j) {
 122     if (i >= V.size.x) return V.RESERVE_PIECES[j];
 123     return this.board[i][j].charAt(1);
 124   }
 125
 126   // Used by the interface:
 127   getReservePpath(index, color) {
 128     return color + V.RESERVE_PIECES[index];
 129   }
 130 //  // Version if some day I have pieces with numbers printed on it:
 131 //  getReservePpath(index, color) {
 132 //    return (
 133 //      "Crazyhouse/" +
 134 //      color + V.RESERVE_PIECES[index] +
 135 //      "_" + this.vr.reserve[playingColor][V.RESERVE_PIECES[i]]
 136 //    );
 137 //  }
 138
 139   // Ordering on reserve pieces
 140   static get RESERVE_PIECES() {
 141     return [V.PAWN, V.ROOK, V.KNIGHT, V.BISHOP, V.QUEEN];
 142   }
 143
 144   getReserveMoves([x, y]) {
 145     const color = this.turn;
 146     const p = V.RESERVE_PIECES[y];
 147     if (this.reserve[color][p] == 0) return [];
 148     let moves = [];
 149     const pawnShift = p == V.PAWN ? 1 : 0;
 150     for (let i = pawnShift; i < V.size.x - pawnShift; i++) {
 151       for (let j = 0; j < V.size.y; j++) {
 152         if (this.board[i][j] == V.EMPTY) {
 153           let mv = new Move({
 154             appear: [
 155               new PiPo({
 156                 x: i,
 157                 y: j,
 158                 c: color,
 159                 p: p
 160               })
 161             ],
 162             vanish: [],
 163             start: { x: x, y: y }, //a bit artificial...
 164             end: { x: i, y: j }
 165           });
 166           moves.push(mv);
 167         }
 168       }
 169     }
 170     return moves;
 171   }
 172
 173   getPotentialMovesFrom([x, y]) {
 174     if (x >= V.size.x) {
 175       // Reserves, outside of board: x == sizeX(+1)
 176       return this.getReserveMoves([x, y]);
 177     }
 178     // Standard moves
 179     return super.getPotentialMovesFrom([x, y]);
 180   }
 181
 182   getAllValidMoves() {
 183     let moves = super.getAllValidMoves();
 184     const color = this.turn;
 185     for (let i = 0; i < V.RESERVE_PIECES.length; i++)
 186       moves = moves.concat(
 187         this.getReserveMoves([V.size.x + (color == "w" ? 0 : 1), i])
 188       );
 189     return this.filterValid(moves);
 190   }
 191
 192   atLeastOneMove() {
 193     if (!super.atLeastOneMove()) {
 194       // Search one reserve move
 195       for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 196         let moves = this.filterValid(
 197           this.getReserveMoves([V.size.x + (this.turn == "w" ? 0 : 1), i])
 198         );
 199         if (moves.length > 0) return true;
 200       }
 201       return false;
 202     }
 203     return true;
 204   }
 205
 206   postPlay(move) {
 207     super.postPlay(move);
 208     if (move.vanish.length == 2 && move.appear.length == 2) return; //skip castle
 209     const color = move.appear[0].c;
 210     if (move.vanish.length == 0) {
 211       this.reserve[color][move.appear[0].p]--;
 212       return;
 213     }
 214     move.movePromoted = this.promoted[move.start.x][move.start.y];
 215     move.capturePromoted = this.promoted[move.end.x][move.end.y];
 216     this.promoted[move.start.x][move.start.y] = false;
 217     this.promoted[move.end.x][move.end.y] =
 218       move.movePromoted ||
 219       (move.vanish[0].p == V.PAWN && move.appear[0].p != V.PAWN);
 220     if (move.capturePromoted) this.reserve[color][V.PAWN]++;
 221     else if (move.vanish.length == 2) this.reserve[color][move.vanish[1].p]++;
 222   }
 223
 224   postUndo(move) {
 225     super.postUndo(move);
 226     if (move.vanish.length == 2 && move.appear.length == 2) return;
 227     const color = this.turn;
 228     if (move.vanish.length == 0) {
 229       this.reserve[color][move.appear[0].p]++;
 230       return;
 231     }
 232     if (move.movePromoted) this.promoted[move.start.x][move.start.y] = true;
 233     this.promoted[move.end.x][move.end.y] = move.capturePromoted;
 234     if (move.capturePromoted) this.reserve[color][V.PAWN]--;
 235     else if (move.vanish.length == 2) this.reserve[color][move.vanish[1].p]--;
 236   }
 237
 238   static get SEARCH_DEPTH() {
 239     return 2;
 240   }
 241
 242   evalPosition() {
 243     let evaluation = super.evalPosition();
 244     // Add reserves:
 245     for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 246       const p = V.RESERVE_PIECES[i];
 247       evaluation += this.reserve["w"][p] * V.VALUES[p];
 248       evaluation -= this.reserve["b"][p] * V.VALUES[p];
 249     }
 250     return evaluation;
 251   }
 252
 253   getNotation(move) {
 254     if (move.vanish.length > 0) return super.getNotation(move);
 255     // Rebirth:
 256     const piece =
 257       move.appear[0].p != V.PAWN ? move.appear[0].p.toUpperCase() : "";
 258     return piece + "@" + V.CoordsToSquare(move.end);
 259   }
 260 };