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