public/javascripts/variants/Crazyhouse.js

   1 class CrazyhouseRules extends ChessRules
   2 {
   3     static IsGoodFen(fen)
   4     {
   5         if (!ChessRules.IsGoodFen(fen))
   6             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)
  13             return false;
  14         if (fenParsed.promoted == "-")
  15             return true; //no promoted piece on board
  16         const squares = fenParsed.promoted.split(",");
  17         for (let square of squares)
  18         {
  19             const c = V.SquareToCoords(square);
  20             if (c.y < 0 || c.y > V.size.y || isNaN(c.x) || c.x < 0 || c.x > V.size.x)
  21                 return false;
  22         }
  23         return true;
  24     }
  25
  26     static ParseFen(fen)
  27     {
  28         const fenParts = fen.split(" ");
  29         return Object.assign(
  30             ChessRules.ParseFen(fen),
  31             {
  32                 reserve: fenParts[5],
  33                 promoted: fenParts[6],
  34             }
  35         );
  36     }
  37
  38     static GenRandInitFen()
  39     {
  40         return ChessRules.GenRandInitFen() + " 0000000000 -";
  41     }
  42
  43     getFen()
  44     {
  45         return super.getFen() + " " + this.getReserveFen() + " " + this.getPromotedFen();
  46     }
  47
  48     getReserveFen()
  49     {
  50         let counts = new Array(10);
  51         for (let i=0; i<V.PIECES.length-1; i++) //-1: no king reserve
  52         {
  53             counts[i] = this.reserve["w"][V.PIECES[i]];
  54             counts[5+i] = this.reserve["b"][V.PIECES[i]];
  55         }
  56         return counts.join("");
  57     }
  58
  59     getPromotedFen()
  60     {
  61         let res = "";
  62         for (let i=0; i<V.size.x; i++)
  63         {
  64             for (let j=0; j<V.size.y; j++)
  65             {
  66                 if (this.promoted[i][j])
  67                     res += V.CoordsToSquare({x:i,y:j});
  68             }
  69         }
  70         if (res.length > 0)
  71             res = res.slice(0,-1); //remove last comma
  72         else
  73             res = "-";
  74         return res;
  75     }
  76
  77     setOtherVariables(fen)
  78     {
  79         super.setOtherVariables(fen);
  80         const fenParsed = V.ParseFen(fen);
  81         // Also init reserves (used by the interface to show landable pieces)
  82         this.reserve =
  83         {
  84             "w":
  85             {
  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             {
  94                 [V.PAWN]: parseInt(fenParsed.reserve[5]),
  95                 [V.ROOK]: parseInt(fenParsed.reserve[6]),
  96                 [V.KNIGHT]: parseInt(fenParsed.reserve[7]),
  97                 [V.BISHOP]: parseInt(fenParsed.reserve[8]),
  98                 [V.QUEEN]: parseInt(fenParsed.reserve[9]),
  99             }
 100         };
 101         this.promoted = doubleArray(V.size.x, V.size.y, false);
 102         if (fenParsed.promoted != "-")
 103         {
 104             for (let square of fenParsed.promoted.split(","))
 105             {
 106                 const [x,y] = V.SquareToCoords(square);
 107                 promoted[x][y] = true;
 108             }
 109         }
 110     }
 111
 112     getColor(i,j)
 113     {
 114         if (i >= V.size.x)
 115             return (i==V.size.x ? "w" : "b");
 116         return this.board[i][j].charAt(0);
 117     }
 118
 119     getPiece(i,j)
 120     {
 121         if (i >= V.size.x)
 122             return V.RESERVE_PIECES[j];
 123         return this.board[i][j].charAt(1);
 124     }
 125
 126     // Used by the interface:
 127     getReservePpath(color, index)
 128     {
 129         return color + V.RESERVE_PIECES[index];
 130     }
 131
 132     // Ordering on reserve pieces
 133     static get RESERVE_PIECES()
 134     {
 135         return [V.PAWN,V.ROOK,V.KNIGHT,V.BISHOP,V.QUEEN];
 136     }
 137
 138     getReserveMoves([x,y])
 139     {
 140         const color = this.turn;
 141         const p = V.RESERVE_PIECES[y];
 142         if (this.reserve[color][p] == 0)
 143             return [];
 144         let moves = [];
 145         const pawnShift = (p==V.PAWN ? 1 : 0);
 146         for (let i=pawnShift; i<V.size.x-pawnShift; i++)
 147         {
 148             for (let j=0; j<V.size.y; j++)
 149             {
 150                 if (this.board[i][j] == V.EMPTY)
 151                 {
 152                     let mv = new Move({
 153                         appear: [
 154                             new PiPo({
 155                                 x: i,
 156                                 y: j,
 157                                 c: color,
 158                                 p: p
 159                             })
 160                         ],
 161                         vanish: [],
 162                         start: {x:x, y:y}, //a bit artificial...
 163                         end: {x:i, y:j}
 164                     });
 165                     moves.push(mv);
 166                 }
 167             }
 168         }
 169         return moves;
 170     }
 171
 172     getPotentialMovesFrom([x,y])
 173     {
 174         if (x >= V.size.x)
 175         {
 176             // Reserves, outside of board: x == sizeX(+1)
 177             return this.getReserveMoves([x,y]);
 178         }
 179         // Standard moves
 180         return super.getPotentialMovesFrom([x,y]);
 181     }
 182
 183     getAllValidMoves()
 184     {
 185         let moves = super.getAllValidMoves();
 186         const color = this.turn;
 187         for (let i=0; i<V.RESERVE_PIECES.length; i++)
 188             moves = moves.concat(this.getReserveMoves([V.size.x+(color=="w"?0:1),i]));
 189         return this.filterValid(moves);
 190     }
 191
 192     atLeastOneMove()
 193     {
 194         if (!super.atLeastOneMove())
 195         {
 196             const color = this.turn;
 197             // Search one reserve move
 198             for (let i=0; i<V.RESERVE_PIECES.length; i++)
 199             {
 200                 let moves = this.filterValid(
 201                     this.getReserveMoves([V.size.x+(this.turn=="w"?0:1), i]) );
 202                 if (moves.length > 0)
 203                     return true;
 204             }
 205             return false;
 206         }
 207         return true;
 208     }
 209
 210     updateVariables(move)
 211     {
 212         super.updateVariables(move);
 213         if (move.vanish.length == 2 && move.appear.length == 2)
 214             return; //skip castle
 215         const color = move.appear[0].c;
 216         if (move.vanish.length == 0)
 217         {
 218             this.reserve[color][move.appear[0].p]--;
 219             return;
 220         }
 221         move.movePromoted = this.promoted[move.start.x][move.start.y];
 222         move.capturePromoted = this.promoted[move.end.x][move.end.y]
 223         this.promoted[move.start.x][move.start.y] = false;
 224         this.promoted[move.end.x][move.end.y] = move.movePromoted
 225             || (move.vanish[0].p == V.PAWN && move.appear[0].p != V.PAWN);
 226         if (move.capturePromoted)
 227             this.reserve[color][V.PAWN]++;
 228         else if (move.vanish.length == 2)
 229             this.reserve[color][move.vanish[1].p]++;
 230     }
 231
 232     unupdateVariables(move)
 233     {
 234         super.unupdateVariables(move);
 235         if (move.vanish.length == 2 && move.appear.length == 2)
 236             return;
 237         const color = this.turn;
 238         if (move.vanish.length == 0)
 239         {
 240             this.reserve[color][move.appear[0].p]++;
 241             return;
 242         }
 243         if (move.movePromoted)
 244             this.promoted[move.start.x][move.start.y] = true;
 245         this.promoted[move.end.x][move.end.y] = move.capturePromoted;
 246         if (move.capturePromoted)
 247             this.reserve[color][V.PAWN]--;
 248         else if (move.vanish.length == 2)
 249             this.reserve[color][move.vanish[1].p]--;
 250     }
 251
 252     static get SEARCH_DEPTH() { return 2; } //high branching factor
 253
 254     evalPosition()
 255     {
 256         let evaluation = super.evalPosition();
 257         // Add reserves:
 258         for (let i=0; i<V.RESERVE_PIECES.length; i++)
 259         {
 260             const p = V.RESERVE_PIECES[i];
 261             evaluation += this.reserve["w"][p] * V.VALUES[p];
 262             evaluation -= this.reserve["b"][p] * V.VALUES[p];
 263         }
 264         return evaluation;
 265     }
 266
 267     getNotation(move)
 268     {
 269         if (move.vanish.length > 0)
 270             return super.getNotation(move);
 271         // Rebirth:
 272         const piece =
 273             (move.appear[0].p != V.PAWN ? move.appear[0].p.toUpperCase() : "");
 274         return piece + "@" + V.CoordsToSquare(move.end);
 275     }
 276
 277     getLongNotation(move)
 278     {
 279         if (move.vanish.length > 0)
 280             return super.getLongNotation(move);
 281         return "@" + V.CoordsToSquare(move.end);
 282     }
 283 }
 284
 285 const VariantRules = CrazyhouseRules;