client/src/variants/Pandemonium.js

   1 import { ChessRules, Move, PiPo } from "@/base_rules";
   2 import { randInt } from "@/utils/alea";
   3
   4 export class PandemoniumRules extends ChessRules {
   5
   6   static get PawnSpecs() {
   7     return Object.assign(
   8       {},
   9       ChessRules.PawnSpecs,
  10       {
  11         threeSquares: true,
  12         promotions: [V.GILDING]
  13       }
  14     );
  15   }
  16
  17   loseOnRepetition() {
  18     // If current side is under check: lost
  19     return this.underCheck(this.turn);
  20   }
  21
  22   static get GILDING() {
  23     return "g";
  24   }
  25
  26   static get SCEPTER() {
  27     return "s";
  28   }
  29
  30   static get HORSE() {
  31     return "h";
  32   }
  33
  34   static get DRAGON() {
  35     return "d";
  36   }
  37
  38   static get CARDINAL() {
  39     return "c";
  40   }
  41
  42   static get WHOLE() {
  43     return "w";
  44   }
  45
  46   static get MARSHAL() {
  47     return "m";
  48   }
  49
  50   static get APRICOT() {
  51     return "a";
  52   }
  53
  54   static get PIECES() {
  55     return (
  56       ChessRules.PIECES.concat([
  57         V.GILDING, V.SCEPTER, V.HORSE, V.DRAGON,
  58         V.CARDINAL, V.WHOLE, V.MARSHAL, V.APRICOT])
  59     );
  60   }
  61
  62   getPpath(b) {
  63     const prefix = (ChessRules.PIECES.includes(b[1]) ? "" : "Pandemonium/");
  64     return prefix + b;
  65   }
  66
  67   static get size() {
  68     return { x: 10, y: 10};
  69   }
  70
  71   getColor(i, j) {
  72     if (i >= V.size.x) return i == V.size.x ? "w" : "b";
  73     return this.board[i][j].charAt(0);
  74   }
  75
  76   getPiece(i, j) {
  77     if (i >= V.size.x) return V.RESERVE_PIECES[j];
  78     return this.board[i][j].charAt(1);
  79   }
  80
  81   setOtherVariables(fen) {
  82     super.setOtherVariables(fen);
  83     // Sub-turn is useful only at first move...
  84     this.subTurn = 1;
  85     // Also init reserves (used by the interface to show landable pieces)
  86     const reserve =
  87       V.ParseFen(fen).reserve.split("").map(x => parseInt(x, 10));
  88     this.reserve = {
  89       w: {
  90         [V.PAWN]: reserve[0],
  91         [V.ROOK]: reserve[1],
  92         [V.KNIGHT]: reserve[2],
  93         [V.BISHOP]: reserve[3],
  94         [V.QUEEN]: reserve[4],
  95         [V.CARDINAL]: reserve[5],
  96         [V.MARSHAL]: reserve[6],
  97       },
  98       b: {
  99         [V.PAWN]: reserve[7],
 100         [V.ROOK]: reserve[8],
 101         [V.KNIGHT]: reserve[9],
 102         [V.BISHOP]: reserve[10],
 103         [V.QUEEN]: reserve[11],
 104         [V.CARDINAL]: reserve[12],
 105         [V.MARSHAL]: reserve[13]
 106       }
 107     };
 108   }
 109
 110   static IsGoodEnpassant(enpassant) {
 111     if (enpassant != "-") {
 112       const squares = enpassant.split(",");
 113       if (squares.length > 2) return false;
 114       for (let sq of squares) {
 115         if (!sq.match(/[a-j0-9]/)) return false;
 116       }
 117     }
 118     return true;
 119   }
 120
 121   static IsGoodFen(fen) {
 122     if (!ChessRules.IsGoodFen(fen)) return false;
 123     const fenParsed = V.ParseFen(fen);
 124     // Check reserves
 125     if (!fenParsed.reserve || !fenParsed.reserve.match(/^[0-9]{14,14}$/))
 126       return false;
 127     return true;
 128   }
 129
 130   static ParseFen(fen) {
 131     const fenParts = fen.split(" ");
 132     return Object.assign(
 133       ChessRules.ParseFen(fen),
 134       { reserve: fenParts[5] }
 135     );
 136   }
 137
 138   getFen() {
 139     return super.getFen() + " " + this.getReserveFen();
 140   }
 141
 142   getFenForRepeat() {
 143     return super.getFenForRepeat() + "_" + this.getReserveFen();
 144   }
 145
 146   getReserveFen() {
 147     let counts = new Array(14);
 148     for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 149       counts[i] = this.reserve["w"][V.RESERVE_PIECES[i]];
 150       counts[7 + i] = this.reserve["b"][V.RESERVE_PIECES[i]];
 151     }
 152     return counts.join("");
 153   }
 154
 155   static GenRandInitFen(randomness) {
 156     // No randomization here for now (but initial setup choice)
 157     return (
 158       "rnbqkmcbnr/pppppppppp/91/91/91/91/91/91/PPPPPPPPPP/RNBQKMCBNR " +
 159       "w 0 ajaj - 00000000000000"
 160     );
 161     // TODO later: randomization too --> 2 bishops, not next to each other.
 162     // then knights next to bishops. Then other pieces (...).
 163   }
 164
 165   getEnpassantFen() {
 166     const L = this.epSquares.length;
 167     if (!this.epSquares[L - 1]) return "-"; //no en-passant
 168     let res = "";
 169     this.epSquares[L - 1].forEach(sq => {
 170       res += V.CoordsToSquare(sq) + ",";
 171     });
 172     return res.slice(0, -1); //remove last comma
 173   }
 174
 175   getEpSquare(moveOrSquare) {
 176     if (!moveOrSquare) return undefined;
 177     if (typeof moveOrSquare === "string") {
 178       const square = moveOrSquare;
 179       if (square == "-") return undefined;
 180       let res = [];
 181       square.split(",").forEach(sq => {
 182         res.push(V.SquareToCoords(sq));
 183       });
 184       return res;
 185     }
 186     // Argument is a move:
 187     const move = moveOrSquare;
 188     const [sx, sy, ex] = [move.start.x, move.start.y, move.end.x];
 189     if (this.getPiece(sx, sy) == V.PAWN && Math.abs(sx - ex) >= 2) {
 190       const step = (ex - sx) / Math.abs(ex - sx);
 191       let res = [{
 192         x: sx + step,
 193         y: sy
 194       }];
 195       if (sx + 2 * step != ex) {
 196         // 3-squares jump
 197         res.push({
 198           x: sx + 2 * step,
 199           y: sy
 200         });
 201       }
 202       return res;
 203     }
 204     return undefined; //default
 205   }
 206
 207   getReservePpath(index, color) {
 208     const p = V.RESERVE_PIECES[index];
 209     const prefix = (ChessRules.PIECES.includes(p) ? "" : "Pandemonium/");
 210     return prefix + color + p;;
 211   }
 212
 213   // Ordering on reserve pieces
 214   static get RESERVE_PIECES() {
 215     return (
 216       [V.PAWN, V.ROOK, V.KNIGHT, V.BISHOP, V.QUEEN, V.CARDINAL, V.MARSHAL]
 217     );
 218   }
 219
 220   getReserveMoves([x, y]) {
 221     const color = this.turn;
 222     const oppCol = V.GetOppCol(color);
 223     const p = V.RESERVE_PIECES[y];
 224     if (this.reserve[color][p] == 0) return [];
 225     const bounds = (p == V.PAWN ? [1, V.size.x - 1] : [0, V.size.x]);
 226     let moves = [];
 227     for (let i = bounds[0]; i < bounds[1]; i++) {
 228       for (let j = 0; j < V.size.y; j++) {
 229         if (this.board[i][j] == V.EMPTY) {
 230           let mv = new Move({
 231             appear: [
 232               new PiPo({
 233                 x: i,
 234                 y: j,
 235                 c: color,
 236                 p: p
 237               })
 238             ],
 239             vanish: [],
 240             start: { x: x, y: y }, //a bit artificial...
 241             end: { x: i, y: j }
 242           });
 243           if (p == V.PAWN) {
 244             // Do not drop on checkmate:
 245             this.play(mv);
 246             const res = (
 247               this.underCheck(oppCol) && !this.atLeastOneMove("noReserve")
 248             );
 249             this.undo(mv);
 250             if (res) continue;
 251           }
 252           moves.push(mv);
 253         }
 254       }
 255     }
 256     return moves;
 257   }
 258
 259   static get PromoteMap() {
 260     return {
 261       r: 'd',
 262       n: 's',
 263       b: 'h',
 264       c: 'w',
 265       m: 'a'
 266     };
 267   }
 268
 269   getPotentialMovesFrom([x, y]) {
 270     const c = this.getColor(x, y);
 271     const oppCol = V.GetOppCol(c);
 272     if (this.movesCount <= 1) {
 273       if (this.kingPos[c][0] == x && this.kingPos[c][1] == y) {
 274         // Pass (if setup is ok)
 275         return [
 276           new Move({
 277             appear: [],
 278             vanish: [],
 279             start: { x: this.kingPos[c][0], y: this.kingPos[c][1] },
 280             end: { x: this.kingPos[oppCol][0], y: this.kingPos[oppCol][1] }
 281           })
 282         ];
 283       }
 284       const firstRank = (this.movesCount == 0 ? 9 : 0);
 285       // TODO: initDestFile currently hardcoded for deterministic setup
 286       const initDestFile = new Map([[1, 2], [8, 7]]);
 287       // Only option is knight --> bishop swap:
 288       if (
 289         x == firstRank &&
 290         !!initDestFile.get(y) &&
 291         this.getPiece(x, y) == V.KNIGHT
 292       ) {
 293         const destFile = initDestFile.get(y);
 294         return [
 295           new Move({
 296             appear: [
 297               new PiPo({
 298                 x: x,
 299                 y: destFile,
 300                 c: c,
 301                 p: V.KNIGHT
 302               }),
 303               new PiPo({
 304                 x: x,
 305                 y: y,
 306                 c: c,
 307                 p: V.BISHOP
 308               })
 309             ],
 310             vanish: [
 311               new PiPo({
 312                 x: x,
 313                 y: y,
 314                 c: c,
 315                 p: V.KNIGHT
 316               }),
 317               new PiPo({
 318                 x: x,
 319                 y: destFile,
 320                 c: c,
 321                 p: V.BISHOP
 322               })
 323             ],
 324             start: { x: x, y: y },
 325             end: { x: x, y: destFile }
 326           })
 327         ];
 328       }
 329       return [];
 330     }
 331     // Normal move (after initial setup)
 332     if (x >= V.size.x) return this.getReserveMoves(x, y);
 333     const p = this.getPiece(x, y);
 334     const sq = [x, y];
 335     let moves = [];
 336     if (ChessRules.PIECES.includes(p))
 337       moves = super.getPotentialMovesFrom(sq);
 338     if ([V.GILDING, V.APRICOT, V.WHOLE].includes(p))
 339       moves = super.getPotentialQueenMoves(sq);
 340     switch (p) {
 341       case V.SCEPTER:
 342         moves = this.getPotentialScepterMoves(sq);
 343         break;
 344       case V.HORSE:
 345         moves = this.getPotentialHorseMoves(sq);
 346         break;
 347       case V.DRAGON:
 348         moves = this.getPotentialDragonMoves(sq);
 349         break;
 350       case V.CARDINAL:
 351         moves = this.getPotentialCardinalMoves(sq);
 352         break;
 353       case V.MARSHAL:
 354         moves = this.getPotentialMarshalMoves(sq);
 355         break;
 356     }
 357     // Maybe apply promotions:
 358     if (Object.keys(V.PromoteMap).includes(p)) {
 359       const promoted = V.PromoteMap[p];
 360       const lastRank = (c == 'w' ? 0 : 9);
 361       let promotions = [];
 362       moves.forEach(m => {
 363         if (m.start.x == lastRank || m.end.x == lastRank) {
 364           let pMove = JSON.parse(JSON.stringify(m));
 365           pMove.appear[0].p = promoted;
 366           promotions.push(pMove);
 367         }
 368       });
 369       Array.prototype.push.apply(moves, promotions);
 370     }
 371     return moves;
 372   }
 373
 374   getPotentialPawnMoves([x, y]) {
 375     const color = this.turn;
 376     const shiftX = V.PawnSpecs.directions[color];
 377     let moves = [];
 378     if (this.board[x + shiftX][y] == V.EMPTY) {
 379       this.addPawnMoves([x, y], [x + shiftX, y], moves);
 380       if ((color == 'w' && x >= V.size.x - 3) || (color == 'b' && x <= 3)) {
 381         if (this.board[x + 2 * shiftX][y] == V.EMPTY) {
 382           moves.push(this.getBasicMove([x, y], [x + 2 * shiftX, y]));
 383           if (
 384             (
 385               (color == 'w' && x >= V.size.x - 2) ||
 386               (color == 'b' && x <= 2)
 387             )
 388             &&
 389             this.board[x + 3 * shiftX][y] == V.EMPTY
 390           ) {
 391             moves.push(this.getBasicMove([x, y], [x + 3 * shiftX, y]));
 392           }
 393         }
 394       }
 395     }
 396     for (let shiftY of [-1, 1]) {
 397       if (y + shiftY >= 0 && y + shiftY < V.size.y) {
 398         if (
 399           this.board[x + shiftX][y + shiftY] != V.EMPTY &&
 400           this.canTake([x, y], [x + shiftX, y + shiftY])
 401         ) {
 402           this.addPawnMoves([x, y], [x + shiftX, y + shiftY], moves);
 403         }
 404       }
 405     }
 406     Array.prototype.push.apply(
 407       moves,
 408       this.getEnpassantCaptures([x, y], shiftX)
 409     );
 410     return moves;
 411   }
 412
 413   getPotentialMarshalMoves(sq) {
 414     return this.getSlideNJumpMoves(sq, V.steps[V.ROOK]).concat(
 415       this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep")
 416     );
 417   }
 418
 419   getPotentialCardinalMoves(sq) {
 420     return this.getSlideNJumpMoves(sq, V.steps[V.BISHOP]).concat(
 421       this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep")
 422     );
 423   }
 424
 425   getPotentialScepterMoves(sq) {
 426     const steps =
 427       V.steps[V.KNIGHT].concat(V.steps[V.BISHOP]).concat(V.steps[V.ROOK]);
 428     return this.getSlideNJumpMoves(sq, steps, "oneStep");
 429   }
 430
 431   getPotentialHorseMoves(sq) {
 432     return this.getSlideNJumpMoves(sq, V.steps[V.BISHOP]).concat(
 433       this.getSlideNJumpMoves(sq, V.steps[V.ROOK], "oneStep"));
 434   }
 435
 436   getPotentialDragonMoves(sq) {
 437     return this.getSlideNJumpMoves(sq, V.steps[V.ROOK]).concat(
 438       this.getSlideNJumpMoves(sq, V.steps[V.BISHOP], "oneStep"));
 439   }
 440
 441   getEnpassantCaptures([x, y], shiftX) {
 442     const Lep = this.epSquares.length;
 443     const epSquare = this.epSquares[Lep - 1];
 444     let moves = [];
 445     if (!!epSquare) {
 446       for (let epsq of epSquare) {
 447         // TODO: some redundant checks
 448         if (epsq.x == x + shiftX && Math.abs(epsq.y - y) == 1) {
 449           let enpassantMove = this.getBasicMove([x, y], [epsq.x, epsq.y]);
 450           // WARNING: the captured pawn may be diagonally behind us,
 451           // if it's a 3-squares jump and we take on 1st passing square
 452           const px = this.board[x][epsq.y] != V.EMPTY ? x : x - shiftX;
 453           enpassantMove.vanish.push({
 454             x: px,
 455             y: epsq.y,
 456             p: "p",
 457             c: this.getColor(px, epsq.y)
 458           });
 459           moves.push(enpassantMove);
 460         }
 461       }
 462     }
 463     return moves;
 464   }
 465
 466   getPotentialKingMoves(sq) {
 467     // Initialize with normal moves
 468     let moves = this.getSlideNJumpMoves(
 469       sq,
 470       V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
 471       "oneStep"
 472     );
 473     const c = this.turn;
 474     if (
 475       this.castleFlags[c][0] < V.size.y ||
 476       this.castleFlags[c][1] < V.size.y
 477     ) {
 478       const finalSquares = [
 479         [1, 2],
 480         [7, 6]
 481       ];
 482       moves = moves.concat(super.getCastleMoves(sq, finalSquares));
 483     }
 484     return moves;
 485   }
 486
 487   isAttacked(sq, color) {
 488     return (
 489       this.isAttackedByPawn(sq, color) ||
 490       this.isAttackedByRook(sq, color) ||
 491       this.isAttackedByKnight(sq, color) ||
 492       this.isAttackedByBishop(sq, color) ||
 493       this.isAttackedByKing(sq, color) ||
 494       this.isAttackedByQueens(sq, color) ||
 495       this.isAttackedByScepter(sq, color) ||
 496       this.isAttackedByDragon(sq, color) ||
 497       this.isAttackedByHorse(sq, color) ||
 498       this.isAttackedByMarshal(sq, color) ||
 499       this.isAttackedByCardinal(sq, color)
 500     );
 501   }
 502
 503   isAttackedByQueens([x, y], color) {
 504     // pieces: because queen = gilding = whole = apricot
 505     const pieces = [V.QUEEN, V.GILDING, V.WHOLE, V.APRICOT];
 506     const steps = V.steps[V.ROOK].concat(V.steps[V.BISHOP]);
 507     for (let step of steps) {
 508       let rx = x + step[0],
 509           ry = y + step[1];
 510       while (V.OnBoard(rx, ry) && this.board[rx][ry] == V.EMPTY) {
 511         rx += step[0];
 512         ry += step[1];
 513       }
 514       if (
 515         V.OnBoard(rx, ry) &&
 516         this.board[rx][ry] != V.EMPTY &&
 517         pieces.includes(this.getPiece(rx, ry)) &&
 518         this.getColor(rx, ry) == color
 519       ) {
 520         return true;
 521       }
 522     }
 523     return false;
 524   }
 525
 526   isAttackedByScepter(sq, color) {
 527     const steps =
 528       V.steps[V.KNIGHT].concat(V.steps[V.ROOK]).concat(V.steps[V.BISHOP]);
 529     return (
 530       super.isAttackedBySlideNJump(sq, color, V.SCEPTER, steps, "oneStep")
 531     );
 532   }
 533
 534   isAttackedByHorse(sq, color) {
 535     return (
 536       super.isAttackedBySlideNJump(sq, color, V.steps[V.BISHOP], V.HORSE) ||
 537       super.isAttackedBySlideNJump(
 538         sq, color, V.HORSE, V.steps[V.ROOK], "oneStep")
 539     );
 540   }
 541
 542   isAttackedByDragon(sq, color) {
 543     return (
 544       super.isAttackedBySlideNJump(sq, color, V.steps[V.ROOK], V.DRAGON) ||
 545       super.isAttackedBySlideNJump(
 546         sq, color, V.DRAGON, V.steps[V.BISHOP], "oneStep")
 547     );
 548   }
 549
 550   isAttackedByMarshal(sq, color) {
 551     return (
 552       super.isAttackedBySlideNJump(sq, color, V.MARSHAL, V.steps[V.ROOK]) ||
 553       super.isAttackedBySlideNJump(
 554         sq,
 555         color,
 556         V.MARSHAL,
 557         V.steps[V.KNIGHT],
 558         "oneStep"
 559       )
 560     );
 561   }
 562
 563   isAttackedByCardinal(sq, color) {
 564     return (
 565       super.isAttackedBySlideNJump(sq, color, V.CARDINAL, V.steps[V.BISHOP]) ||
 566       super.isAttackedBySlideNJump(
 567         sq,
 568         color,
 569         V.CARDINAL,
 570         V.steps[V.KNIGHT],
 571         "oneStep"
 572       )
 573     );
 574   }
 575
 576   getAllValidMoves() {
 577     let moves = super.getAllPotentialMoves();
 578     if (this.movesCount >= 2) {
 579       const color = this.turn;
 580       for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 581         moves = moves.concat(
 582           this.getReserveMoves([V.size.x + (color == "w" ? 0 : 1), i])
 583         );
 584       }
 585     }
 586     return this.filterValid(moves);
 587   }
 588
 589   atLeastOneMove(noReserve) {
 590     if (!super.atLeastOneMove()) {
 591       if (!noReserve) {
 592         // Search one reserve move
 593         for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 594           let moves = this.filterValid(
 595             this.getReserveMoves([V.size.x + (this.turn == "w" ? 0 : 1), i])
 596           );
 597           if (moves.length > 0) return true;
 598         }
 599       }
 600       return false;
 601     }
 602     return true;
 603   }
 604
 605   // Reverse 'PromoteMap'
 606   static get P_CORRESPONDANCES() {
 607     return {
 608       d: 'r',
 609       s: 'n',
 610       h: 'b',
 611       w: 'c',
 612       a: 'm',
 613       g: 'p'
 614     };
 615   }
 616
 617   static MayDecode(piece) {
 618     if (Object.keys(V.P_CORRESPONDANCES).includes(piece))
 619       return V.P_CORRESPONDANCES[piece];
 620     return piece;
 621   }
 622
 623   play(move) {
 624     move.subTurn = this.subTurn; //much easier
 625     if (this.movesCount >= 2 || this.subTurn == 2 || move.vanish.length == 0) {
 626       this.turn = V.GetOppCol(this.turn);
 627       this.subTurn = 1;
 628       this.movesCount++;
 629     }
 630     else this.subTurn = 2;
 631     move.flags = JSON.stringify(this.aggregateFlags());
 632     this.epSquares.push(this.getEpSquare(move));
 633     V.PlayOnBoard(this.board, move);
 634     this.postPlay(move);
 635   }
 636
 637   postPlay(move) {
 638     if (move.vanish.length == 0 && move.appear.length == 0) return;
 639     super.postPlay(move);
 640     const color = move.appear[0].c;
 641     if (move.vanish.length == 0)
 642       // Drop unpromoted piece:
 643       this.reserve[color][move.appear[0].p]--;
 644     else if (move.vanish.length == 2 && move.appear.length == 1)
 645       // May capture a promoted piece:
 646       this.reserve[color][V.MayDecode(move.vanish[1].p)]++;
 647   }
 648
 649   undo(move) {
 650     this.epSquares.pop();
 651     this.disaggregateFlags(JSON.parse(move.flags));
 652     V.UndoOnBoard(this.board, move);
 653     if (this.movesCount >= 2 || this.subTurn == 1 || move.vanish.length == 0) {
 654       this.turn = V.GetOppCol(this.turn);
 655       this.movesCount--;
 656     }
 657     this.subTurn = move.subTurn;
 658     this.postUndo(move);
 659   }
 660
 661   postUndo(move) {
 662     if (move.vanish.length == 0 && move.appear.length == 0) return;
 663     super.postUndo(move);
 664     const color = move.appear[0].c;
 665     if (move.vanish.length == 0)
 666       this.reserve[color][move.appear[0].p]++;
 667     else if (move.vanish.length == 2 && move.appear.length == 1)
 668       this.reserve[color][V.MayDecode(move.vanish[1].p)]--;
 669   }
 670
 671   static get VALUES() {
 672     return Object.assign(
 673       {},
 674       ChessRules.VALUES,
 675       {
 676         n: 2.5, //knight is weaker
 677         g: 9,
 678         s: 5,
 679         h: 6,
 680         d: 7,
 681         c: 7,
 682         w: 9,
 683         m: 8,
 684         a: 9
 685       }
 686     );
 687   }
 688
 689   static get SEARCH_DEPTH() {
 690     return 2;
 691   }
 692
 693   getComputerMove() {
 694     if (this.movesCount <= 1) {
 695       // Special case: swap and pass at random
 696       const moves1 = this.getAllValidMoves();
 697       const m1 = moves1[randInt(moves1.length)];
 698       this.play(m1);
 699       if (m1.vanish.length == 0) {
 700         this.undo(m1);
 701         return m1;
 702       }
 703       const moves2 = this.getAllValidMoves();
 704       const m2 = moves2[randInt(moves2.length)];
 705       this.undo(m1);
 706       return [m1, m2];
 707     }
 708     return super.getComputerMove();
 709   }
 710
 711   evalPosition() {
 712     let evaluation = super.evalPosition();
 713     // Add reserves:
 714     for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 715       const p = V.RESERVE_PIECES[i];
 716       evaluation += this.reserve["w"][p] * V.VALUES[p];
 717       evaluation -= this.reserve["b"][p] * V.VALUES[p];
 718     }
 719     return evaluation;
 720   }
 721
 722   getNotation(move) {
 723     if (move.vanish.length == 0) {
 724       if (move.appear.length == 0) return "pass";
 725       const pieceName =
 726         (move.appear[0].p == V.PAWN ? "" : move.appear[0].p.toUpperCase());
 727       return pieceName + "@" + V.CoordsToSquare(move.end);
 728     }
 729     if (move.appear.length == 2) {
 730       if (move.appear[0].p != V.KING)
 731         return V.CoordsToSquare(move.start) + "S" + V.CoordsToSquare(move.end);
 732       return (move.end.y < move.start.y ? "0-0" : "0-0-0");
 733     }
 734     let notation = super.getNotation(move);
 735     if (move.vanish[0].p != V.PAWN && move.appear[0].p != move.vanish[0].p)
 736       // Add promotion indication:
 737       notation += "=" + move.appear[0].p.toUpperCase();
 738     return notation;
 739   }
 740
 741 };