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