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