client/src/variants/Crazyhouse.js

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