variants/Chakart/class.js

   1 import ChessRules from "/base_rules.js";
   2 import GiveawayRules from "/variants/Giveaway/class.js";
   3 import { ArrayFun } from "/utils/array.js";
   4 import { Random } from "/utils/alea.js";
   5 import PiPo from "/utils/PiPo.js";
   6 import Move from "/utils/Move.js";
   7
   8 export default class ChakartRules extends ChessRules {
   9
  10   static get Options() {
  11     return {
  12       select: [
  13         {
  14           label: "Randomness",
  15           variable: "randomness",
  16           defaut: 2,
  17           options: [
  18             {label: "Deterministic", value: 0},
  19             {label: "Symmetric random", value: 1},
  20             {label: "Asymmetric random", value: 2}
  21           ]
  22         }
  23       ],
  24       styles: ["cylinder"]
  25     };
  26   }
  27
  28   get pawnPromotions() {
  29     return ['q', 'r', 'n', 'b', 'k'];
  30   }
  31
  32   get hasCastle() {
  33     return false;
  34   }
  35   get hasEnpassant() {
  36     return false;
  37   }
  38   get hasReserve() {
  39     return true;
  40   }
  41   get hasReserveFen() {
  42     return false;
  43   }
  44
  45   static get IMMOBILIZE_CODE() {
  46     return {
  47       'p': 's',
  48       'r': 'u',
  49       'n': 'o',
  50       'b': 'c',
  51       'q': 't',
  52       'k': 'l'
  53     };
  54   }
  55
  56   static get IMMOBILIZE_DECODE() {
  57     return {
  58       's': 'p',
  59       'u': 'r',
  60       'o': 'n',
  61       'c': 'b',
  62       't': 'q',
  63       'l': 'k'
  64     };
  65   }
  66
  67   // Fictive color 'a', bomb banana mushroom egg
  68   static get BOMB() {
  69     return 'w'; //"Wario"
  70   }
  71   static get BANANA() {
  72     return 'd'; //"Donkey"
  73   }
  74   static get EGG() {
  75     return 'e';
  76   }
  77   static get MUSHROOM() {
  78     return 'm';
  79   }
  80
  81   static get EGG_SURPRISE() {
  82     return [
  83       "kingboo", "bowser", "daisy", "koopa",
  84       "luigi", "waluigi", "toadette", "chomp"];
  85   }
  86
  87   canIplay(x, y) {
  88     if (
  89       this.playerColor != this.turn ||
  90       Object.keys(V.IMMOBILIZE_DECODE).includes(this.getPiece(x, y))
  91     ) {
  92       return false;
  93     }
  94     return this.egg == "kingboo" || this.getColor(x, y) == this.turn;
  95   }
  96
  97   pieces(color, x, y) {
  98     const specials = {
  99       'i': {"class": "invisible"}, //queen
 100       '?': {"class": "mystery"}, //...initial square
 101       'e': {"class": "egg"},
 102       'm': {"class": "mushroom"},
 103       'd': {"class": "banana"},
 104       'w': {"class": "bomb"},
 105       'z': {"class": "remote-capture"}
 106     };
 107     const bowsered = {
 108       's': {"class": ["immobilized", "pawn"]},
 109       'u': {"class": ["immobilized", "rook"]},
 110       'o': {"class": ["immobilized", "knight"]},
 111       'c': {"class": ["immobilized", "bishop"]},
 112       't': {"class": ["immobilized", "queen"]},
 113       'l': {"class": ["immobilized", "king"]}
 114     };
 115     return Object.assign(
 116       {
 117         'y': {
 118           // Virtual piece for "king remote shell captures"
 119           moves: [],
 120           attack: [
 121             {
 122               steps: [
 123                 [0, 1], [0, -1], [1, 0], [-1, 0],
 124                 [1, 1], [1, -1], [-1, 1], [-1, -1]
 125               ]
 126             }
 127           ]
 128         }
 129       },
 130       specials, bowsered, super.pieces(color, x, y));
 131   }
 132
 133   genRandInitFen(seed) {
 134     const options = Object.assign({mode: "suicide"}, this.options);
 135     const gr = new GiveawayRules({options: options, genFenOnly: true});
 136     // Add Peach + mario flags
 137     return gr.genRandInitFen(seed).slice(0, -17) + '{"flags":"1111"}';
 138   }
 139
 140   fen2board(f) {
 141     return (
 142       f.charCodeAt() <= 90
 143         ? "w" + f.toLowerCase()
 144         : (['w', 'd', 'e', 'm'].includes(f) ? "a" : "b") + f
 145     );
 146   }
 147
 148   setFlags(fenflags) {
 149     // King can send shell? Queen can be invisible?
 150     this.powerFlags = {
 151       w: {k: false, q: false},
 152       b: {k: false, q: false}
 153     };
 154     for (let c of ['w', 'b']) {
 155       for (let p of ['k', 'q']) {
 156         this.powerFlags[c][p] =
 157           fenflags.charAt((c == "w" ? 0 : 2) + (p == 'k' ? 0 : 1)) == "1";
 158       }
 159     }
 160   }
 161
 162   aggregateFlags() {
 163     return this.powerFlags;
 164   }
 165
 166   disaggregateFlags(flags) {
 167     this.powerFlags = flags;
 168   }
 169
 170   getFlagsFen() {
 171     return ['w', 'b'].map(c => {
 172       return ['k', 'q'].map(p => this.powerFlags[c][p] ? "1" : "0").join("");
 173     }).join("");
 174   }
 175
 176   setOtherVariables(fenParsed) {
 177     this.setFlags(fenParsed.flags);
 178     this.reserve = {}; //to be filled later
 179     this.egg = null;
 180     this.moveStack = [];
 181     // Change seed (after FEN generation!!)
 182     // so that further calls differ between players:
 183     Random.setSeed(Math.floor(19840 * Math.random()));
 184   }
 185
 186   // For Toadette bonus
 187   getDropMovesFrom([c, p]) {
 188     if (typeof c != "string" || this.reserve[c][p] == 0)
 189       return [];
 190     let moves = [];
 191     const start = (c == 'w' && p == 'p' ? 1 : 0);
 192     const end = (c == 'b' && p == 'p' ? 7 : 8);
 193     for (let i = start; i < end; i++) {
 194       for (let j = 0; j < this.size.y; j++) {
 195         const pieceIJ = this.getPiece(i, j);
 196         const colIJ = this.getColor(i, j);
 197         if (this.board[i][j] == "" || colIJ == 'a' || pieceIJ == 'i') {
 198           let m = new Move({
 199             start: {x: c, y: p},
 200             appear: [new PiPo({x: i, y: j, c: c, p: p})],
 201             vanish: []
 202           });
 203           // A drop move may remove a bonus (or hidden queen!)
 204           if (this.board[i][j] != "")
 205             m.vanish.push(new PiPo({x: i, y: j, c: colIJ, p: pieceIJ}));
 206           moves.push(m);
 207         }
 208       }
 209     }
 210     return moves;
 211   }
 212
 213   getPotentialMovesFrom([x, y]) {
 214     let moves = [];
 215     const piece = this.getPiece(x, y);
 216     if (this.egg == "toadette")
 217       moves = this.getDropMovesFrom([x, y]);
 218     else if (this.egg == "kingboo") {
 219       const color = this.turn;
 220       const oppCol = C.GetOppCol(color);
 221       // Only allow to swap (non-immobilized!) pieces
 222       for (let i=0; i<this.size.x; i++) {
 223         for (let j=0; j<this.size.y; j++) {
 224           const colIJ = this.getColor(i, j);
 225           const pieceIJ = this.getPiece(i, j);
 226           if (
 227             (i != x || j != y) &&
 228             ['w', 'b'].includes(colIJ) &&
 229             !Object.keys(V.IMMOBILIZE_DECODE).includes(pieceIJ) &&
 230             // Next conditions = no pawn on last rank
 231             (
 232               piece != 'p' ||
 233               (
 234                 (color != 'w' || i != 0) &&
 235                 (color != 'b' || i != this.size.x - 1)
 236               )
 237             )
 238             &&
 239             (
 240               pieceIJ != 'p' ||
 241               (
 242                 (colIJ != 'w' || x != 0) &&
 243                 (colIJ != 'b' || x != this.size.x - 1)
 244               )
 245             )
 246           ) {
 247             let m = this.getBasicMove([x, y], [i, j]);
 248             m.appear.push(new PiPo({x: x, y: y, p: pieceIJ, c: colIJ}));
 249             m.kingboo = true; //avoid some side effects (bananas/bombs)
 250             moves.push(m);
 251           }
 252         }
 253       }
 254     }
 255     else {
 256       // Normal case (including bonus daisy)
 257       switch (piece) {
 258         case 'p':
 259           moves = this.getPawnMovesFrom([x, y]); //apply promotions
 260           break;
 261         case 'q':
 262           moves = this.getQueenMovesFrom([x, y]);
 263           break;
 264         case 'k':
 265           moves = this.getKingMovesFrom([x, y]);
 266           break;
 267         case 'n':
 268           moves = this.getKnightMovesFrom([x, y]);
 269           break;
 270         case 'b':
 271         case 'r':
 272           // Explicitely listing types to avoid moving immobilized piece
 273           moves = this.getPotentialMovesOf(piece, [x, y]);
 274           break;
 275       }
 276     }
 277     return moves;
 278   }
 279
 280   canStepOver(i, j) {
 281     return (
 282       this.board[i][j] == "" ||
 283       ['i', V.EGG, V.MUSHROOM].includes(this.getPiece(i, j))
 284     );
 285   }
 286
 287   getPawnMovesFrom([x, y]) {
 288     const color = this.turn;
 289     const oppCol = C.GetOppCol(color);
 290     const shiftX = (color == 'w' ? -1 : 1);
 291     const firstRank = (color == "w" ? this.size.x - 1 : 0);
 292     let moves = [];
 293     const frontPiece = this.getPiece(x + shiftX, y);
 294     if (
 295       this.board[x + shiftX][y] == "" ||
 296       this.getColor(x + shiftX, y) == 'a' ||
 297       frontPiece == 'i'
 298     ) {
 299       moves.push(this.getBasicMove([x, y], [x + shiftX, y]));
 300       if (
 301         [firstRank, firstRank + shiftX].includes(x) &&
 302         ![V.BANANA, V.BOMB].includes(frontPiece) &&
 303         (
 304           this.board[x + 2 * shiftX][y] == "" ||
 305           this.getColor(x + 2 * shiftX, y) == 'a' ||
 306           this.getPiece(x + 2 * shiftX, y) == 'i'
 307         )
 308       ) {
 309         moves.push(this.getBasicMove([x, y], [x + 2 * shiftX, y]));
 310       }
 311     }
 312     for (let shiftY of [-1, 1]) {
 313       const nextY = this.getY(y + shiftY);
 314       if (
 315         nextY >= 0 &&
 316         nextY < this.size.y &&
 317         this.board[x + shiftX][nextY] != "" &&
 318         // Pawns cannot capture invisible queen this way!
 319         this.getPiece(x + shiftX, nextY) != 'i' &&
 320         ['a', oppCol].includes(this.getColor(x + shiftX, nextY))
 321       ) {
 322         moves.push(this.getBasicMove([x, y], [x + shiftX, nextY]));
 323       }
 324     }
 325     this.pawnPostProcess(moves, color, oppCol);
 326     // Add mushroom on before-last square (+ potential segments)
 327     moves.forEach(m => {
 328       let [mx, my] = [x, y];
 329       if (Math.abs(m.end.x - m.start.x) == 2)
 330         mx = (m.start.x + m.end.x) / 2;
 331       m.appear.push(new PiPo({x: mx, y: my, c: 'a', p: 'm'}));
 332       if (mx != x && this.board[mx][my] != "") {
 333         m.vanish.push(new PiPo({
 334           x: mx,
 335           y: my,
 336           c: this.getColor(mx, my),
 337           p: this.getPiece(mx, my)
 338         }));
 339       }
 340       if (Math.abs(m.end.y - m.start.y) > 1) {
 341         m.segments = [
 342           [[x, y], [x, y]],
 343           [[m.end.x, m.end.y], [m.end.x, m.end.y]]
 344         ];
 345       }
 346     });
 347     return moves;
 348   }
 349
 350   getKnightMovesFrom([x, y]) {
 351     // Add egg on initial square:
 352     return this.getPotentialMovesOf('n', [x, y]).map(m => {
 353       m.appear.push(new PiPo({p: "e", c: "a", x: x, y: y}));
 354       return m;
 355     });
 356   }
 357
 358   getQueenMovesFrom(sq) {
 359     const normalMoves = this.getPotentialMovesOf('q', sq);
 360     // If flag allows it, add 'invisible movements'
 361     let invisibleMoves = [];
 362     if (this.powerFlags[this.turn]['q']) {
 363       normalMoves.forEach(m => {
 364         if (
 365           m.appear.length == 1 &&
 366           m.vanish.length == 1 &&
 367           // Only simple non-capturing moves:
 368           m.vanish[0].c != 'a'
 369         ) {
 370           let im = JSON.parse(JSON.stringify(m));
 371           im.appear[0].p = 'i';
 372           im.noAnimate = true;
 373           invisibleMoves.push(im);
 374         }
 375       });
 376     }
 377     return normalMoves.concat(invisibleMoves);
 378   }
 379
 380   getKingMovesFrom([x, y]) {
 381     let moves = this.getPotentialMovesOf('k', [x, y]);
 382     // If flag allows it, add 'remote shell captures'
 383     if (this.powerFlags[this.turn]['k']) {
 384       let shellCaptures = this.getPotentialMovesOf('y', [x, y]);
 385       shellCaptures.forEach(sc => {
 386         sc.shell = true; //easier play()
 387         sc.choice = 'z'; //to display in showChoices()
 388         // Fix move (Rifle style):
 389         sc.vanish.shift();
 390         sc.appear.shift();
 391       });
 392       Array.prototype.push.apply(moves, shellCaptures);
 393     }
 394     return moves;
 395   }
 396
 397   play(move) {
 398     const color = this.turn;
 399     const oppCol = C.GetOppCol(color);
 400     if (
 401       move.appear.length > 0 &&
 402       move.appear[0].p == 'p' &&
 403       (
 404         (color == 'w' && move.end.x == 0) ||
 405         (color == 'b' && move.end.x == this.size.x - 1)
 406       )
 407     ) {
 408       // "Forgotten" promotion, which occurred after some effect
 409       let moves = [move];
 410       super.pawnPostProcess(moves, color, oppCol);
 411       super.showChoices(moves);
 412       return false;
 413     }
 414     if (!move.nextComputed) {
 415       // Set potential random effects, so that play() is deterministic
 416       // from opponent viewpoint:
 417       const endPiece = this.getPiece(move.end.x, move.end.y);
 418       switch (endPiece) {
 419         case V.EGG:
 420           move.egg = Random.sample(V.EGG_SURPRISE);
 421           move.next = this.getEggEffect(move);
 422           break;
 423         case V.MUSHROOM:
 424           move.next = this.getMushroomEffect(move);
 425           break;
 426         case V.BANANA:
 427         case V.BOMB:
 428           move.next = this.getBombBananaEffect(move, endPiece);
 429           break;
 430       }
 431       if (!move.next && move.appear.length > 0 && !move.kingboo) {
 432         const movingPiece = move.appear[0].p;
 433         if (['b', 'r'].includes(movingPiece)) {
 434           // Drop a banana or bomb:
 435           const bs =
 436             this.getRandomSquare([move.end.x, move.end.y],
 437               movingPiece == 'r'
 438                 ? [[1, 1], [1, -1], [-1, 1], [-1, -1]]
 439                 : [[1, 0], [-1, 0], [0, 1], [0, -1]],
 440               "freeSquare");
 441           if (bs) {
 442             move.appear.push(
 443               new PiPo({
 444                 x: bs[0],
 445                 y: bs[1],
 446                 c: 'a',
 447                 p: movingPiece == 'r' ? 'd' : 'w'
 448               })
 449             );
 450             if (this.board[bs[0]][bs[1]] != "") {
 451               move.vanish.push(
 452                 new PiPo({
 453                   x: bs[0],
 454                   y: bs[1],
 455                   c: this.getColor(bs[0], bs[1]),
 456                   p: this.getPiece(bs[0], bs[1])
 457                 })
 458               );
 459             }
 460           }
 461         }
 462       }
 463       move.nextComputed = true;
 464     }
 465     this.egg = move.egg;
 466     if (move.egg == "toadette") {
 467       this.reserve = { w: {}, b: {} };
 468       // Randomly select a piece in pawnPromotions
 469       if (!move.toadette)
 470         move.toadette = Random.sample(this.pawnPromotions);
 471       this.reserve[color][move.toadette] = 1;
 472       this.re_drawReserve([color]);
 473     }
 474     else if (Object.keys(this.reserve).length > 0) {
 475       this.reserve = {};
 476       this.re_drawReserve([color]);
 477     }
 478     if (move.shell)
 479       this.powerFlags[color]['k'] = false;
 480     else if (move.appear.length > 0 && move.appear[0].p == 'i') {
 481       this.powerFlags[move.appear[0].c]['q'] = false;
 482       if (color == this.playerColor) {
 483         move.appear.push(
 484           new PiPo({x: move.start.x, y: move.start.y, c: color, p: '?'}));
 485       }
 486     }
 487     if (color == this.playerColor) {
 488       // Look for an immobilized piece of my color: it can now move
 489       for (let i=0; i<8; i++) {
 490         for (let j=0; j<8; j++) {
 491           if ((i != move.end.x || j != move.end.y) && this.board[i][j] != "") {
 492             const piece = this.getPiece(i, j);
 493             if (
 494               this.getColor(i, j) == color &&
 495               Object.keys(V.IMMOBILIZE_DECODE).includes(piece)
 496             ) {
 497               move.vanish.push(new PiPo({
 498                 x: i, y: j, c: color, p: piece
 499               }));
 500               move.appear.push(new PiPo({
 501                 x: i, y: j, c: color, p: V.IMMOBILIZE_DECODE[piece]
 502               }));
 503             }
 504           }
 505         }
 506       }
 507       // Also make opponent invisible queen visible again, if any
 508       for (let i=0; i<8; i++) {
 509         for (let j=0; j<8; j++) {
 510           if (
 511             this.board[i][j] != "" &&
 512             this.getColor(i, j) == oppCol
 513           ) {
 514             const pieceIJ = this.getPiece(i, j);
 515             if (pieceIJ == 'i') {
 516               move.vanish.push(new PiPo({x: i, y: j, c: oppCol, p: 'i'}));
 517               move.appear.push(new PiPo({x: i, y: j, c: oppCol, p: 'q'}));
 518             }
 519             else if (pieceIJ == '?')
 520               move.vanish.push(new PiPo({x: i, y: j, c: oppCol, p: '?'}));
 521           }
 522         }
 523       }
 524     }
 525     if (!move.next && !["daisy", "toadette", "kingboo"].includes(move.egg)) {
 526       this.turn = oppCol;
 527       this.movesCount++;
 528     }
 529     if (move.egg)
 530       this.displayBonus(move);
 531     this.playOnBoard(move);
 532     this.nextMove = move.next;
 533     return true;
 534   }
 535
 536   // Helper to set and apply banana/bomb effect
 537   getRandomSquare([x, y], steps, freeSquare) {
 538     let validSteps = steps.filter(s => this.onBoard(x + s[0], y + s[1]));
 539     if (freeSquare) {
 540       // Square to put banana/bomb cannot be occupied by a piece
 541       validSteps = validSteps.filter(s => {
 542         return ["", 'a'].includes(this.getColor(x + s[0], y + s[1]))
 543       });
 544     }
 545     if (validSteps.length == 0)
 546       return null;
 547     const step = validSteps[Random.randInt(validSteps.length)];
 548     return [x + step[0], y + step[1]];
 549   }
 550
 551   getEggEffect(move) {
 552     const getRandomPiece = (c) => {
 553       let bagOfPieces = [];
 554       for (let i=0; i<this.size.x; i++) {
 555         for (let j=0; j<this.size.y; j++) {
 556           if (this.getColor(i, j) == c && this.getPiece(i, j) != 'k')
 557             bagOfPieces.push([i, j]);
 558         }
 559       }
 560       if (bagOfPieces.length >= 1)
 561         return Random.sample(bagOfPieces);
 562       return null;
 563     };
 564     const color = this.turn;
 565     let em = null;
 566     switch (move.egg) {
 567       case "luigi":
 568       case "waluigi":
 569         // Change color of friendly or enemy piece, king excepted
 570         const oldColor = (move.egg == "waluigi" ? color : C.GetOppCol(color));
 571         const newColor = C.GetOppCol(oldColor);
 572         const coords = getRandomPiece(oldColor);
 573         if (coords) {
 574           const piece = this.getPiece(coords[0], coords[1]);
 575           em = new Move({
 576             appear: [
 577               new PiPo({x: coords[0], y: coords[1], c: newColor, p: piece})
 578             ],
 579             vanish: [
 580               new PiPo({x: coords[0], y: coords[1], c: oldColor, p: piece})
 581             ]
 582           });
 583         }
 584         break;
 585       case "bowser":
 586         em = new Move({
 587           appear: [
 588             new PiPo({
 589               x: move.end.x,
 590               y: move.end.y,
 591               c: color,
 592               p: V.IMMOBILIZE_CODE[move.appear[0].p]
 593             })
 594           ],
 595           vanish: [
 596             new PiPo({
 597               x: move.end.x,
 598               y: move.end.y,
 599               c: color,
 600               p: move.appear[0].p
 601             })
 602           ]
 603         });
 604         break;
 605       case "koopa":
 606         // Reverse move
 607         em = new Move({
 608           appear: [
 609             new PiPo({
 610               x: move.start.x, y: move.start.y, c: color, p: move.appear[0].p
 611             })
 612           ],
 613           vanish: [
 614             new PiPo({
 615               x: move.end.x, y: move.end.y, c: color, p: move.appear[0].p
 616             })
 617           ]
 618         });
 619         if (this.board[move.start.x][move.start.y] != "") {
 620           // Pawn or knight let something on init square
 621           em.vanish.push(new PiPo({
 622             x: move.start.x,
 623             y: move.start.y,
 624             c: 'a',
 625             p: this.getPiece(move.start.x, move.start.y)
 626           }));
 627         }
 628         break;
 629       case "chomp":
 630         // Eat piece
 631         em = new Move({
 632           appear: [],
 633           vanish: [
 634             new PiPo({
 635               x: move.end.x, y: move.end.y, c: color, p: move.appear[0].p
 636             })
 637           ],
 638           end: {x: move.end.x, y: move.end.y}
 639         });
 640         break;
 641     }
 642     if (em && move.egg != "koopa")
 643       em.noAnimate = true; //static move
 644     return em;
 645   }
 646
 647   getMushroomEffect(move) {
 648     if (typeof move.start.x == "string") //drop move (toadette)
 649       return null;
 650     let step = [move.end.x - move.start.x, move.end.y - move.start.y];
 651     if ([0, 1].some(i => Math.abs(step[i]) >= 2 && Math.abs(step[1-i]) != 1)) {
 652       // Slider, multi-squares: normalize step
 653       for (let j of [0, 1])
 654         step[j] = step[j] / Math.abs(step[j]) || 0;
 655     }
 656     const nextSquare = [move.end.x + step[0], move.end.y + step[1]];
 657     const afterSquare =
 658       [nextSquare[0] + step[0], nextSquare[1] + step[1]];
 659     let nextMove = null;
 660     if (this.onBoard(nextSquare[0], nextSquare[1])) {
 661       this.playOnBoard(move); //HACK for getBasicMove()
 662       nextMove = this.getBasicMove([move.end.x, move.end.y], nextSquare);
 663       this.undoOnBoard(move);
 664     }
 665     return nextMove;
 666   }
 667
 668   getBombBananaEffect(move, item) {
 669     const steps = item == V.BANANA
 670       ? [[1, 0], [-1, 0], [0, 1], [0, -1]]
 671       : [[1, 1], [1, -1], [-1, 1], [-1, -1]];
 672     const nextSquare = this.getRandomSquare([move.end.x, move.end.y], steps);
 673     this.playOnBoard(move); //HACK for getBasicMove()
 674     const res = this.getBasicMove([move.end.x, move.end.y], nextSquare);
 675     this.undoOnBoard(move);
 676     return res;
 677   }
 678
 679   displayBonus(move) {
 680     let divBonus = document.createElement("div");
 681     divBonus.classList.add("bonus-text");
 682     divBonus.innerHTML = move.egg;
 683     let container = document.getElementById(this.containerId);
 684     container.appendChild(divBonus);
 685     setTimeout(() => container.removeChild(divBonus), 2000);
 686   }
 687
 688   atLeastOneMove() {
 689     return true;
 690   }
 691
 692   filterValid(moves) {
 693     return moves;
 694   }
 695
 696   playPlusVisual(move, r) {
 697     const nextLines = () => {
 698       if (!this.play(move))
 699         return;
 700       this.moveStack.push(move);
 701       this.playVisual(move, r);
 702       if (this.nextMove)
 703         this.playPlusVisual(this.nextMove, r);
 704       else {
 705         this.afterPlay(this.moveStack);
 706         this.moveStack = [];
 707       }
 708     };
 709     if (this.moveStack.length == 0)
 710       nextLines();
 711     else
 712       this.animate(move, nextLines);
 713   }
 714
 715 };