client/src/variants/Shogun.js

   1 import { ChessRules, PiPo, Move } from "@/base_rules";
   2 import { ArrayFun } from "@/utils/array";
   3
   4 export class ShogunRules extends ChessRules {
   5
   6   static get CAPTAIN() {
   7     return 'c';
   8   }
   9   static get GENERAL() {
  10     return 'g';
  11   }
  12   static get ARCHBISHOP() {
  13     return 'a';
  14   }
  15   static get MORTAR() {
  16     return 'm';
  17   }
  18   static get DUCHESS() {
  19     return 'f';
  20   }
  21
  22   static get PIECES() {
  23     return (
  24       ChessRules.PIECES
  25       .concat([V.CAPTAIN, V.GENERAL, V.ARCHBISHOP, V.MORTAR, V.DUCHESS])
  26     );
  27   }
  28
  29   getPpath(b) {
  30     return "Shogun/" + b;
  31   }
  32
  33   getReservePpath(index, color) {
  34     return "Shogun/" + color + V.RESERVE_PIECES[index];
  35   }
  36
  37   static IsGoodFen(fen) {
  38     if (!ChessRules.IsGoodFen(fen)) return false;
  39     const fenParsed = V.ParseFen(fen);
  40     // 5) Check reserves
  41     if (!fenParsed.reserve || !fenParsed.reserve.match(/^[0-9]{10,10}$/))
  42       return false;
  43     return true;
  44   }
  45
  46   static ParseFen(fen) {
  47     const fenParts = fen.split(" ");
  48     return Object.assign(
  49       ChessRules.ParseFen(fen),
  50       { reserve: fenParts[5] }
  51     );
  52   }
  53
  54   static GenRandInitFen(randomness) {
  55     return ChessRules.GenRandInitFen(randomness) + " 0000000000";
  56   }
  57
  58   getFen() {
  59     return super.getFen() + " " + this.getReserveFen();
  60   }
  61
  62   getFenForRepeat() {
  63     return super.getFenForRepeat() + "_" + this.getReserveFen();
  64   }
  65
  66   getReserveFen() {
  67     let counts = new Array(10);
  68     for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
  69       counts[i] = this.reserve["w"][V.RESERVE_PIECES[i]];
  70       counts[5 + i] = this.reserve["b"][V.RESERVE_PIECES[i]];
  71     }
  72     return counts.join("");
  73   }
  74
  75   setOtherVariables(fen) {
  76     super.setOtherVariables(fen);
  77     // Also init reserves (used by the interface to show landable pieces)
  78     const reserve =
  79       V.ParseFen(fen).reserve.split("").map(x => parseInt(x, 10));
  80     this.reserve = {
  81       w: {
  82         [V.PAWN]: reserve[0],
  83         [V.ROOK]: reserve[1],
  84         [V.KNIGHT]: reserve[2],
  85         [V.BISHOP]: reserve[3],
  86         [V.DUCHESS]: reserve[4]
  87       },
  88       b: {
  89         [V.PAWN]: reserve[5],
  90         [V.ROOK]: reserve[6],
  91         [V.KNIGHT]: reserve[7],
  92         [V.BISHOP]: reserve[8],
  93         [V.DUCHESS]: reserve[9]
  94       }
  95     };
  96   }
  97
  98   getColor(i, j) {
  99     if (i >= V.size.x) return i == V.size.x ? "w" : "b";
 100     return this.board[i][j].charAt(0);
 101   }
 102
 103   getPiece(i, j) {
 104     if (i >= V.size.x) return V.RESERVE_PIECES[j];
 105     return this.board[i][j].charAt(1);
 106   }
 107
 108   // Ordering on reserve pieces
 109   static get RESERVE_PIECES() {
 110     return [V.PAWN, V.ROOK, V.KNIGHT, V.BISHOP, V.DUCHESS];
 111   }
 112
 113   getReserveMoves([x, y]) {
 114     const color = this.turn;
 115     const iZone = (color == 'w' ? [3, 4, 5, 6, 7] : [0, 1, 2, 3, 4]);
 116     const p = V.RESERVE_PIECES[y];
 117     if (this.reserve[color][p] == 0) return [];
 118     let moves = [];
 119     for (let i of iZone) {
 120       for (let j = 0; j < V.size.y; j++) {
 121         if (this.board[i][j] == V.EMPTY) {
 122           let mv = new Move({
 123             appear: [
 124               new PiPo({
 125                 x: i,
 126                 y: j,
 127                 c: color,
 128                 p: p
 129               })
 130             ],
 131             vanish: [],
 132             start: { x: x, y: y }, //a bit artificial...
 133             end: { x: i, y: j }
 134           });
 135           moves.push(mv);
 136         }
 137       }
 138     }
 139     return moves;
 140   }
 141
 142   static get MapUnpromoted() {
 143     return {
 144       f: 'q',
 145       r: 'm',
 146       b: 'a',
 147       p: 'c',
 148       n: 'g'
 149     };
 150   }
 151
 152   getPotentialMovesFrom([x, y]) {
 153     if (x >= V.size.x)
 154       // Reserves, outside of board: x == sizeX(+1)
 155       return this.getReserveMoves([x, y]);
 156     // Standard moves
 157     const piece = this.getPiece(x, y);
 158     const sq = [x, y];
 159     if (piece == V.KING) return super.getPotentialKingMoves(sq);
 160     let moves = [];
 161     switch (piece) {
 162       // Unpromoted
 163       case V.PAWN:
 164         return this.getPotentialPawnMoves(sq);
 165       case V.ROOK:
 166         moves = super.getPotentialRookMoves(sq);
 167         break;
 168       case V.KNIGHT:
 169         moves = super.getPotentialKnightMoves(sq);
 170         break;
 171       case V.BISHOP:
 172         moves = super.getPotentialBishopMoves(sq);
 173         break;
 174       case V.DUCHESS:
 175         moves = this.getPotentialDuchessMoves(sq);
 176         break;
 177     }
 178     if ([V.ROOK, V.KNIGHT, V.BISHOP, V.DUCHESS].includes(piece)) {
 179       let extraMoves = [];
 180       // Check that no promoted form is already on board:
 181       const promotedForm = V.MapUnpromoted[piece];
 182       const c = this.turn;
 183       if (
 184         this.board.some(b =>
 185           b.some(cell =>
 186             cell[0] == c && cell[1] == promotedForm)
 187         )
 188       ) {
 189         return moves;
 190       }
 191       const promotionZone = (this.turn == 'w' ? [0, 1, 2] : [5, 6, 7]);
 192       moves.forEach(m => {
 193         if (
 194           promotionZone.includes(m.end.x) ||
 195           promotionZone.includes(m.start.x)
 196         ) {
 197           let newMove = JSON.parse(JSON.stringify(m));
 198           newMove.appear[0].p = promotedForm;
 199           extraMoves.push(newMove);
 200         }
 201       });
 202       return moves.concat(extraMoves);
 203     }
 204     switch (piece) {
 205       // Promoted
 206       case V.CAPTAIN: return this.getPotentialCaptainMoves(sq);
 207       case V.MORTAR: return this.getPotentialMortarMoves(sq);
 208       case V.GENERAL: return this.getPotentialGeneralMoves(sq);
 209       case V.ARCHBISHOP: return this.getPotentialArchbishopMoves(sq);
 210       case V.QUEEN: return super.getPotentialQueenMoves(sq);
 211     }
 212     return []; //never reached
 213   }
 214
 215   getPotentialPawnMoves([x, y]) {
 216     // NOTE: apply promotion freely, but not on en-passant
 217     const c = this.turn;
 218     const oppCol = V.GetOppCol(c);
 219     const forward = (c == 'w' ? -1 : 1);
 220     const initialRank = (c == 'w' ? 6 : 1);
 221     let moves = [];
 222     // Pawn push
 223     let [i, j] = [x + forward, y];
 224     if (this.board[i][j] == V.EMPTY) {
 225       moves.push(this.getBasicMove([x, y], [i, j]));
 226       if (x == initialRank && this.board[i + forward][j] == V.EMPTY)
 227         moves.push(this.getBasicMove([x, y], [i + forward, j]));
 228     }
 229     // Captures
 230     for (let shiftY of [-1, 1]) {
 231       [i, j] = [x + forward, y + shiftY];
 232       if (
 233         V.OnBoard(i, j) &&
 234         this.board[i][j] != V.EMPTY &&
 235         this.getColor(i, j) == oppCol
 236       ) {
 237         moves.push(this.getBasicMove([x, y], [i, j]));
 238       }
 239     }
 240     let extraMoves = [];
 241     const promotionZone = (this.turn == 'w' ? [1, 2] : [5, 6]);
 242     const lastRank = (c == 'w' ? 0 : 7);
 243     moves.forEach(m => {
 244       if (m.end.x == lastRank)
 245         // Force promotion
 246         m.appear[0].p = V.CAPTAIN;
 247       else if (promotionZone.includes(m.end.x)) {
 248         let newMove = JSON.parse(JSON.stringify(m));
 249         newMove.appear[0].p = V.CAPTAIN;
 250         extraMoves.push(newMove);
 251       }
 252     });
 253     return (
 254       moves.concat(extraMoves)
 255       .concat(super.getEnpassantCaptures([x, y], forward))
 256     );
 257   }
 258
 259   getPotentialDuchessMoves(sq) {
 260     return super.getSlideNJumpMoves(sq, V.steps[V.BISHOP], "oneStep");
 261   }
 262
 263   getPotentialCaptainMoves(sq) {
 264     const steps = V.steps[V.ROOK].concat(V.steps[V.BISHOP]);
 265     return super.getSlideNJumpMoves(sq, steps, "oneStep");
 266   }
 267
 268   getPotentialMortarMoves(sq) {
 269     return (
 270       super.getSlideNJumpMoves(sq, V.steps[V.ROOK])
 271       .concat(super.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep"))
 272     );
 273   }
 274
 275   getPotentialGeneralMoves(sq) {
 276     const steps =
 277       V.steps[V.BISHOP].concat(V.steps[V.ROOK]).concat(V.steps[V.KNIGHT]);
 278     return super.getSlideNJumpMoves(sq, steps, "oneStep");
 279   }
 280
 281   getPotentialArchbishopMoves(sq) {
 282     return (
 283       super.getSlideNJumpMoves(sq, V.steps[V.BISHOP])
 284       .concat(super.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep"))
 285     );
 286   }
 287
 288   isAttacked(sq, color) {
 289     return (
 290       super.isAttacked(sq, color) ||
 291       this.isAttackedByDuchess(sq, color) ||
 292       this.isAttackedByCaptain(sq, color) ||
 293       this.isAttackedByMortar(sq, color) ||
 294       this.isAttackedByGeneral(sq, color) ||
 295       this.isAttackedByArchbishop(sq, color)
 296     );
 297   }
 298
 299   isAttackedByDuchess(sq, color) {
 300     return (
 301       super.isAttackedBySlideNJump(
 302         sq, color, V.DUCHESS, V.steps[V.BISHOP], "oneStep")
 303     );
 304   }
 305
 306   isAttackedByCaptain(sq, color) {
 307     const steps = V.steps[V.BISHOP].concat(V.steps[V.ROOK]);
 308     return (
 309       super.isAttackedBySlideNJump(sq, color, V.DUCHESS, steps, "oneStep")
 310     );
 311   }
 312
 313   isAttackedByMortar(sq, color) {
 314     return (
 315       super.isAttackedBySlideNJump(sq, color, V.MORTAR, V.steps[V.ROOK]) ||
 316       super.isAttackedBySlideNJump(
 317         sq, color, V.MORTAR, V.steps[V.KNIGHT], "oneStep")
 318     );
 319   }
 320
 321   isAttackedByGeneral(sq, color) {
 322     const steps =
 323       V.steps[V.BISHOP].concat(V.steps[V.ROOK]).concat(V.steps[V.KNIGHT]);
 324     return (
 325       super.isAttackedBySlideNJump(sq, color, V.GENERAL, steps, "oneStep")
 326     );
 327   }
 328
 329   isAttackedByArchbishop(sq, color) {
 330     return (
 331       super.isAttackedBySlideNJump(sq, color, V.ARCHBISHOP, V.steps[V.BISHOP])
 332       ||
 333       super.isAttackedBySlideNJump(
 334         sq, color, V.ARCHBISHOP, V.steps[V.KNIGHT], "oneStep")
 335     );
 336   }
 337
 338   getAllValidMoves() {
 339     let moves = super.getAllPotentialMoves();
 340     const color = this.turn;
 341     for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 342       moves = moves.concat(
 343         this.getReserveMoves([V.size.x + (color == "w" ? 0 : 1), i])
 344       );
 345     }
 346     return this.filterValid(moves);
 347   }
 348
 349   atLeastOneMove() {
 350     if (!super.atLeastOneMove()) {
 351       // Search one reserve move
 352       for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 353         let moves = this.filterValid(
 354           this.getReserveMoves([V.size.x + (this.turn == "w" ? 0 : 1), i])
 355         );
 356         if (moves.length > 0) return true;
 357       }
 358       return false;
 359     }
 360     return true;
 361   }
 362
 363   static get MapPromoted() {
 364     return {
 365       q: 'f',
 366       m: 'r',
 367       a: 'b',
 368       c: 'p',
 369       g: 'n'
 370     };
 371   }
 372
 373   getUnpromotedForm(piece) {
 374     if (Object.keys(V.MapPromoted).includes(piece))
 375       return V.MapPromoted[piece];
 376     return piece;
 377   }
 378
 379   postPlay(move) {
 380     super.postPlay(move);
 381     // Skip castle:
 382     if (move.vanish.length == 2 && move.appear.length == 2) return;
 383     const color = move.appear[0].c;
 384     if (move.vanish.length == 0) this.reserve[color][move.appear[0].p]--;
 385     else if (move.vanish.length == 2)
 386       this.reserve[color][this.getUnpromotedForm(move.vanish[1].p)]++;
 387   }
 388
 389   postUndo(move) {
 390     super.postUndo(move);
 391     if (move.vanish.length == 2 && move.appear.length == 2) return;
 392     const color = this.turn;
 393     if (move.vanish.length == 0) this.reserve[color][move.appear[0].p]++;
 394     else if (move.vanish.length == 2)
 395       this.reserve[color][this.getUnpromotedForm(move.vanish[1].p)]--;
 396   }
 397
 398   static get SEARCH_DEPTH() {
 399     return 2;
 400   }
 401
 402   static get VALUES() {
 403     return (
 404       Object.assign(
 405         {
 406           c: 4,
 407           g: 5,
 408           a: 7,
 409           m: 7,
 410           f: 2
 411         },
 412         ChessRules.VALUES
 413       )
 414     );
 415   }
 416
 417   evalPosition() {
 418     let evaluation = super.evalPosition();
 419     // Add reserves:
 420     for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 421       const p = V.RESERVE_PIECES[i];
 422       evaluation += this.reserve["w"][p] * V.VALUES[p];
 423       evaluation -= this.reserve["b"][p] * V.VALUES[p];
 424     }
 425     return evaluation;
 426   }
 427
 428   getNotation(move) {
 429     if (move.vanish.length > 0) return super.getNotation(move);
 430     // Rebirth:
 431     const piece =
 432       move.appear[0].p != V.PAWN ? move.appear[0].p.toUpperCase() : "";
 433     return piece + "@" + V.CoordsToSquare(move.end);
 434   }
 435
 436 };