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         fenpromoted = fenParsed.promoted;
  15         if (fenpromoted == "-")
  16             return true; //no promoted piece on board
  17         const squares = fenpromoted.split(",");
  18         for (let square of squares)
  19         {
  20             const c = V.SquareToCoords(square);
  21             if (c.y < 0 || c.y > V.size.y || isNaN(c.x) || c.x < 0 || c.x > V.size.x)
  22                 return false;
  23         }
  24         return true;
  25     }
  26
  27     static GenRandInitFen()
  28     {
  29         const fen = ChessRules.GenRandInitFen();
  30         return fen.replace(" w 1111", " w 1111 0000000000 -");
  31     }
  32
  33     getFen()
  34     {
  35         return super.getFen() + " " + this.getReserveFen() + " " + this.getPromotedFen();
  36     }
  37
  38     getReserveFen()
  39     {
  40         let counts = _.map(_.range(10), 0);
  41         for (let i=0; i<V.PIECES.length; i++)
  42         {
  43             counts[i] = this.reserve["w"][V.PIECES[i]];
  44             counts[5+i] = this.reserve["b"][V.PIECES[i]];
  45         }
  46         return counts.join("");
  47     }
  48
  49     getPromotedFen()
  50     {
  51         let res = "";
  52         for (let i=0; i<V.size.x; i++)
  53         {
  54             for (let j=0; j<V.size.y; j++)
  55             {
  56                 if (this.promoted[i][j])
  57                     res += V.CoordsToSquare({x:i,y:j});
  58             }
  59         }
  60         if (res.length > 0)
  61             res = res.slice(0,-1); //remove last comma
  62         return res;
  63     }
  64
  65     setOtherVariables(fen)
  66     {
  67         super.setOtherVariables(fen);
  68         const fenParsed = V.ParseFen(fen);
  69         // Also init reserves (used by the interface to show landable pieces)
  70         this.reserve =
  71         {
  72             "w":
  73             {
  74                 [V.PAWN]: parseInt(fenParsed.reserve[0]),
  75                 [V.ROOK]: parseInt(fenParsed.reserve[1]),
  76                 [V.KNIGHT]: parseInt(fenParsed.reserve[2]),
  77                 [V.BISHOP]: parseInt(fenParsed.reserve[3]),
  78                 [V.QUEEN]: parseInt(fenParsed.reserve[4]),
  79             },
  80             "b":
  81             {
  82                 [V.PAWN]: parseInt(fenParsed.reserve[5]),
  83                 [V.ROOK]: parseInt(fenParsed.reserve[6]),
  84                 [V.KNIGHT]: parseInt(fenParsed.reserve[7]),
  85                 [V.BISHOP]: parseInt(fenParsed.reserve[8]),
  86                 [V.QUEEN]: parseInt(fenParsed.reserve[9]),
  87             }
  88         };
  89         this.promoted = doubleArray(V.size.x, V.size.y, false);
  90         for (let square of fenParsd.promoted.split(","))
  91         {
  92             const [x,y] = V.SquareToCoords(square);
  93             promoted[x][y] = true;
  94         }
  95     }
  96
  97     getColor(i,j)
  98     {
  99         if (i >= V.size.x)
 100             return (i==V.size.x ? "w" : "b");
 101         return this.board[i][j].charAt(0);
 102     }
 103
 104     getPiece(i,j)
 105     {
 106         if (i >= V.size.x)
 107             return V.RESERVE_PIECES[j];
 108         return this.board[i][j].charAt(1);
 109     }
 110
 111     // Used by the interface:
 112     getReservePpath(color, index)
 113     {
 114         return color + V.RESERVE_PIECES[index];
 115     }
 116
 117     // Ordering on reserve pieces
 118     static get RESERVE_PIECES()
 119     {
 120         return [V.PAWN,V.ROOK,V.KNIGHT,V.BISHOP,V.QUEEN];
 121     }
 122
 123     getReserveMoves([x,y])
 124     {
 125         const color = this.turn;
 126         const p = V.RESERVE_PIECES[y];
 127         if (this.reserve[color][p] == 0)
 128             return [];
 129         let moves = [];
 130         const pawnShift = (p==V.PAWN ? 1 : 0);
 131         for (let i=pawnShift; i<V.size.x-pawnShift; i++)
 132         {
 133             for (let j=0; j<V.size.y; j++)
 134             {
 135                 if (this.board[i][j] == V.EMPTY)
 136                 {
 137                     let mv = new Move({
 138                         appear: [
 139                             new PiPo({
 140                                 x: i,
 141                                 y: j,
 142                                 c: color,
 143                                 p: p
 144                             })
 145                         ],
 146                         vanish: [],
 147                         start: {x:x, y:y}, //a bit artificial...
 148                         end: {x:i, y:j}
 149                     });
 150                     moves.push(mv);
 151                 }
 152             }
 153         }
 154         return moves;
 155     }
 156
 157     getPotentialMovesFrom([x,y])
 158     {
 159         if (x >= V.size.x)
 160         {
 161             // Reserves, outside of board: x == sizeX(+1)
 162             return this.getReserveMoves([x,y]);
 163         }
 164         // Standard moves
 165         return super.getPotentialMovesFrom([x,y]);
 166     }
 167
 168     getAllValidMoves()
 169     {
 170         let moves = super.getAllValidMoves();
 171         const color = this.turn;
 172         for (let i=0; i<V.RESERVE_PIECES.length; i++)
 173             moves = moves.concat(this.getReserveMoves([V.size.x+(color=="w"?0:1),i]));
 174         return this.filterValid(moves);
 175     }
 176
 177     atLeastOneMove()
 178     {
 179         if (!super.atLeastOneMove())
 180         {
 181             const color = this.turn;
 182             // Search one reserve move
 183             for (let i=0; i<V.RESERVE_PIECES.length; i++)
 184             {
 185                 let moves = this.filterValid(
 186                     this.getReserveMoves([V.size.x+(this.turn=="w"?0:1), i]) );
 187                 if (moves.length > 0)
 188                     return true;
 189             }
 190             return false;
 191         }
 192         return true;
 193     }
 194
 195     updateVariables(move)
 196     {
 197         super.updateVariables(move);
 198         if (move.vanish.length == 2 && move.appear.length == 2)
 199             return; //skip castle
 200         const color = this.turn;
 201         if (move.vanish.length == 0)
 202         {
 203             this.reserve[color][move.appear[0].p]--;
 204             return;
 205         }
 206         move.movePromoted = this.promoted[move.start.x][move.start.y];
 207         move.capturePromoted = this.promoted[move.end.x][move.end.y]
 208         this.promoted[move.start.x][move.start.y] = false;
 209         this.promoted[move.end.x][move.end.y] = move.movePromoted
 210             || (move.vanish[0].p == V.PAWN && move.appear[0].p != V.PAWN);
 211         if (move.capturePromoted)
 212             this.reserve[color][V.PAWN]++;
 213         else if (move.vanish.length == 2)
 214             this.reserve[color][move.vanish[1].p]++;
 215     }
 216
 217     unupdateVariables(move)
 218     {
 219         super.unupdateVariables(move);
 220         if (move.vanish.length == 2 && move.appear.length == 2)
 221             return;
 222         const color = this.turn;
 223         if (move.vanish.length == 0)
 224         {
 225             this.reserve[color][move.appear[0].p]++;
 226             return;
 227         }
 228         if (move.movePromoted)
 229             this.promoted[move.start.x][move.start.y] = true;
 230         this.promoted[move.end.x][move.end.y] = move.capturePromoted;
 231         if (move.capturePromoted)
 232             this.reserve[color][V.PAWN]--;
 233         else if (move.vanish.length == 2)
 234             this.reserve[color][move.vanish[1].p]--;
 235     }
 236
 237     static get SEARCH_DEPTH() { return 2; } //high branching factor
 238
 239     evalPosition()
 240     {
 241         let evaluation = super.evalPosition();
 242         // Add reserves:
 243         for (let i=0; i<V.RESERVE_PIECES.length; i++)
 244         {
 245             const p = V.RESERVE_PIECES[i];
 246             evaluation += this.reserve["w"][p] * V.VALUES[p];
 247             evaluation -= this.reserve["b"][p] * V.VALUES[p];
 248         }
 249         return evaluation;
 250     }
 251
 252     getNotation(move)
 253     {
 254         if (move.vanish.length > 0)
 255             return super.getNotation(move);
 256         // Rebirth:
 257         const piece =
 258             (move.appear[0].p != V.PAWN ? move.appear[0].p.toUpperCase() : "");
 259         return piece + "@" + V.CoordsToSquare(move.end);
 260     }
 261
 262     getLongNotation(move)
 263     {
 264         if (move.vanish.length > 0)
 265             return super.getLongNotation(move);
 266         return "@" + V.CoordsToSquare(move.end);
 267     }
 268 }
 269
 270 const VariantRules = CrazyhouseRules;