client/src/variants/Chakart.js

   1 import { ChessRules, Move, PiPo } from "@/base_rules";
   2 import { SuicideRules } from "@/variants/Suicide";
   3 import { ArrayFun } from "@/utils/array";
   4 import { randInt } from "@/utils/alea";
   5
   6 export class ChakartRules extends ChessRules {
   7   static get PawnSpecs() {
   8     return SuicideRules.PawnSpecs;
   9   }
  10
  11   static get HasCastle() {
  12     return false;
  13   }
  14
  15   static get HasEnpassant() {
  16     return false;
  17   }
  18
  19   static get CorrConfirm() {
  20     // Because of bonus effects
  21     return false;
  22   }
  23
  24   static get CanAnalyze() {
  25     return false;
  26   }
  27
  28   static get SomeHiddenMoves() {
  29     return true;
  30   }
  31
  32   hoverHighlight(x, y) {
  33     if (this.subTurn == 1) return false;
  34     const L = this.firstMove.length;
  35     const fm = this.firstMove[L-1];
  36     if (fm.end.effect != 0) return false;
  37     const deltaX = Math.abs(fm.appear[0].x - x);
  38     const deltaY = Math.abs(fm.appear[0].y - y);
  39     return (
  40       (this.board[x][y] == V.EMPTY || this.getColor(x, y) == 'a') &&
  41       (
  42         (fm.vanish[0].p == V.ROOK && deltaX == 1 && deltaY == 1) ||
  43         (fm.vanish[0].p == V.BISHOP && deltaX + deltaY == 1)
  44       )
  45     );
  46   }
  47
  48   static get IMMOBILIZE_CODE() {
  49     return {
  50       'p': 's',
  51       'r': 'u',
  52       'n': 'o',
  53       'b': 'c',
  54       'q': 't',
  55       'k': 'l'
  56     };
  57   }
  58
  59   static get IMMOBILIZE_DECODE() {
  60     return {
  61       's': 'p',
  62       'u': 'r',
  63       'o': 'n',
  64       'c': 'b',
  65       't': 'q',
  66       'l': 'k'
  67     };
  68   }
  69
  70   static get INVISIBLE_QUEEN() {
  71     return 'i';
  72   }
  73
  74   // Fictive color 'a', bomb banana mushroom egg
  75   static get BOMB() {
  76     return 'w'; //"Wario"
  77   }
  78   static get BANANA() {
  79     return 'd'; //"Donkey"
  80   }
  81   static get EGG() {
  82     return 'e';
  83   }
  84   static get MUSHROOM() {
  85     return 'm';
  86   }
  87
  88   static fen2board(f) {
  89     return (
  90       f.charCodeAt() <= 90
  91         ? "w" + f.toLowerCase()
  92         : (['w', 'd', 'e', 'm'].includes(f) ? "a" : "b") + f
  93     );
  94   }
  95
  96   static get PIECES() {
  97     return (
  98       ChessRules.PIECES.concat(
  99       Object.keys(V.IMMOBILIZE_DECODE)).concat(
 100       [V.BANANA, V.BOMB, V.EGG, V.MUSHROOM, V.INVISIBLE_QUEEN])
 101     );
 102   }
 103
 104   getPpath(b) {
 105     let prefix = "";
 106     if (
 107       b[0] == 'a' ||
 108       b[1] == V.INVISIBLE_QUEEN ||
 109       Object.keys(V.IMMOBILIZE_DECODE).includes(b[1])
 110     ) {
 111       prefix = "Chakart/";
 112     }
 113     return prefix + b;
 114   }
 115
 116   getPPpath(m) {
 117     if (!!m.promoteInto) return m.promoteInto;
 118     let piece = m.appear[0].p;
 119     if (Object.keys(V.IMMOBILIZE_DECODE).includes(piece))
 120       piece = V.IMMOBILIZE_DECODE[piece];
 121     return this.getPpath(m.appear[0].c + piece);
 122   }
 123
 124   static ParseFen(fen) {
 125     const fenParts = fen.split(" ");
 126     return Object.assign(
 127       ChessRules.ParseFen(fen),
 128       { captured: fenParts[4] }
 129     );
 130   }
 131
 132   static IsGoodFen(fen) {
 133     if (!ChessRules.IsGoodFen(fen)) return false;
 134     const captured = V.ParseFen(fen).captured;
 135     if (!captured || !captured.match(/^[0-9]{12,12}$/)) return false;
 136     return true;
 137   }
 138
 139   // King can be l or L (immobilized) --> similar to Alice variant
 140   static IsGoodPosition(position) {
 141     if (position.length == 0) return false;
 142     const rows = position.split("/");
 143     if (rows.length != V.size.x) return false;
 144     let kings = { "k": 0, "K": 0, 'l': 0, 'L': 0 };
 145     for (let row of rows) {
 146       let sumElts = 0;
 147       for (let i = 0; i < row.length; i++) {
 148         if (['K', 'k', 'L', 'l'].includes(row[i])) kings[row[i]]++;
 149         if (V.PIECES.includes(row[i].toLowerCase())) sumElts++;
 150         else {
 151           const num = parseInt(row[i], 10);
 152           if (isNaN(num)) return false;
 153           sumElts += num;
 154         }
 155       }
 156       if (sumElts != V.size.y) return false;
 157     }
 158     if (kings['k'] + kings['l'] == 0 || kings['K'] + kings['L'] == 0)
 159       return false;
 160     return true;
 161   }
 162
 163   static IsGoodFlags(flags) {
 164     // 4 for Peach + Mario w, b
 165     return !!flags.match(/^[01]{4,4}$/);
 166   }
 167
 168   setFlags(fenflags) {
 169     // King can send shell? Queen can be invisible?
 170     this.powerFlags = {
 171       w: { 'k': false, 'q': false },
 172       b: { 'k': false, 'q': false }
 173     };
 174     for (let c of ["w", "b"]) {
 175       for (let p of ['k', 'q']) {
 176         this.powerFlags[c][p] =
 177           fenflags.charAt((c == "w" ? 0 : 2) + (p == 'k' ? 0 : 1)) == "1";
 178       }
 179     }
 180   }
 181
 182   aggregateFlags() {
 183     return this.powerFlags;
 184   }
 185
 186   disaggregateFlags(flags) {
 187     this.powerFlags = flags;
 188   }
 189
 190   getFen() {
 191     return super.getFen() + " " + this.getCapturedFen();
 192   }
 193
 194   getFenForRepeat() {
 195     return super.getFenForRepeat() + "_" + this.getCapturedFen();
 196   }
 197
 198   getCapturedFen() {
 199     let counts = [...Array(12).fill(0)];
 200     let i = 0;
 201     for (let p of V.RESERVE_PIECES) {
 202       counts[i] = this.captured["w"][p];
 203       counts[6 + i] = this.captured["b"][p];
 204       i++;
 205     }
 206     return counts.join("");
 207   }
 208
 209   scanKings() {}
 210
 211   setOtherVariables(fen) {
 212     super.setOtherVariables(fen);
 213     // Initialize captured pieces' counts from FEN
 214     const captured =
 215       V.ParseFen(fen).captured.split("").map(x => parseInt(x, 10));
 216     this.captured = {
 217       w: {
 218         [V.PAWN]: captured[0],
 219         [V.ROOK]: captured[1],
 220         [V.KNIGHT]: captured[2],
 221         [V.BISHOP]: captured[3],
 222         [V.QUEEN]: captured[4],
 223         [V.KING]: captured[5]
 224       },
 225       b: {
 226         [V.PAWN]: captured[6],
 227         [V.ROOK]: captured[7],
 228         [V.KNIGHT]: captured[8],
 229         [V.BISHOP]: captured[9],
 230         [V.QUEEN]: captured[10],
 231         [V.KING]: captured[11]
 232       }
 233     };
 234     this.firstMove = [];
 235     this.subTurn = 1;
 236   }
 237
 238   getFlagsFen() {
 239     let fen = "";
 240     // Add power flags
 241     for (let c of ["w", "b"])
 242       for (let p of ['k', 'q']) fen += (this.powerFlags[c][p] ? "1" : "0");
 243     return fen;
 244   }
 245
 246   getColor(i, j) {
 247     if (i >= V.size.x) return i == V.size.x ? "w" : "b";
 248     return this.board[i][j].charAt(0);
 249   }
 250
 251   getPiece(i, j) {
 252     if (i >= V.size.x) return V.RESERVE_PIECES[j];
 253     return this.board[i][j].charAt(1);
 254   }
 255
 256   getReservePpath(index, color) {
 257     return color + V.RESERVE_PIECES[index];
 258   }
 259
 260   static get RESERVE_PIECES() {
 261     return [V.PAWN, V.ROOK, V.KNIGHT, V.BISHOP, V.QUEEN, V.KING];
 262   }
 263
 264   getReserveMoves([x, y]) {
 265     const color = this.turn;
 266     const p = V.RESERVE_PIECES[y];
 267     if (this.reserve[color][p] == 0) return [];
 268     let moves = [];
 269     const start = (color == 'w' && p == V.PAWN ? 1 : 0);
 270     const end = (color == 'b' && p == V.PAWN ? 7 : 8);
 271     for (let i = start; i < end; i++) {
 272       for (let j = 0; j < V.size.y; j++) {
 273         if (
 274           this.board[i][j] == V.EMPTY ||
 275           this.getColor(i, j) == 'a' ||
 276           this.getPiece(i, j) == V.INVISIBLE_QUEEN
 277         ) {
 278           let m = this.getBasicMove({ p: p, x: i, y: j});
 279           m.start = { x: x, y: y };
 280           moves.push(m);
 281         }
 282       }
 283     }
 284     return moves;
 285   }
 286
 287   getPotentialMovesFrom([x, y]) {
 288     let moves = [];
 289     if (this.subTurn == 1) {
 290       moves = super.getPotentialMovesFrom([x, y]);
 291       const finalPieces = V.PawnSpecs.promotions;
 292       const color = this.turn;
 293       const lastRank = (color == "w" ? 0 : 7);
 294       let pMoves = [];
 295       moves.forEach(m => {
 296         if (
 297           m.appear.length > 0 &&
 298           ['p', 's'].includes(m.appear[0].p) &&
 299           m.appear[0].x == lastRank
 300         ) {
 301           for (let i = 1; i < finalPieces.length; i++) {
 302             const piece = finalPieces[i];
 303             let otherM = JSON.parse(JSON.stringify(m));
 304             otherM.appear[0].p =
 305               m.appear[0].p == V.PAWN
 306                 ? finalPieces[i]
 307                 : V.IMMOBILIZE_CODE[finalPieces[i]];
 308             pMoves.push(otherM);
 309           }
 310           // Finally alter m itself:
 311           m.appear[0].p =
 312             m.appear[0].p == V.PAWN
 313               ? finalPieces[0]
 314               : V.IMMOBILIZE_CODE[finalPieces[0]];
 315         }
 316       });
 317       Array.prototype.push.apply(moves, pMoves);
 318     }
 319     else {
 320       // Subturn == 2
 321       const L = this.firstMove.length;
 322       const fm = this.firstMove[L-1];
 323       switch (fm.end.effect) {
 324         case "kingboo":
 325           // Exchange position with any piece,
 326           // except pawns if arriving on last rank.
 327           const lastRank = { 'w': 0, 'b': 7 };
 328           const color = this.turn;
 329           const allowLastRank = (this.getPiece(x, y) != V.PAWN);
 330           for (let i=0; i<8; i++) {
 331             for (let j=0; j<8; j++) {
 332               const colIJ = this.getColor(i, j);
 333               if (
 334                 (i != x || j != y) &&
 335                 this.board[i][j] != V.EMPTY &&
 336                 colIJ != 'a'
 337               ) {
 338                 const pieceIJ = this.getPiece(i, j);
 339                 if (
 340                   (pieceIJ != V.PAWN || x != lastRank[colIJ]) &&
 341                   (allowLastRank || i != lastRank[color])
 342                 ) {
 343                   const movedUnit = new PiPo({
 344                     x: x,
 345                     y: y,
 346                     c: colIJ,
 347                     p: this.getPiece(i, j)
 348                   });
 349                   let mMove = this.getBasicMove({ x: x, y: y }, [i, j]);
 350                   mMove.appear.push(movedUnit);
 351                   moves.push(mMove);
 352                 }
 353               }
 354             }
 355           }
 356           break;
 357         case "toadette":
 358           // Resurrect a captured piece
 359           if (x >= V.size.x) moves = this.getReserveMoves([x, y]);
 360           break;
 361         case "daisy":
 362           // Play again with the same piece
 363           if (fm.appear[0].x == x && fm.appear[0].y == y)
 364             moves = super.getPotentialMovesFrom([x, y]);
 365           break;
 366       }
 367     }
 368     return moves;
 369   }
 370
 371   // Helper for getBasicMove()
 372   getRandomSquare([x, y], steps) {
 373     const color = this.turn;
 374     const validSteps = steps.filter(s => {
 375       const [i, j] = [x + s[0], y + s[1]];
 376       return (
 377         V.OnBoard(i, j) &&
 378         (this.board[i][j] == V.EMPTY || this.getColor(i, j) != color)
 379       );
 380     });
 381     if (validSteps.length == 0)
 382       // Can happen after mushroom jump
 383       return [x, y];
 384     const step = validSteps[randInt(validSteps.length)];
 385     return [x + step[0], y + step[1]];
 386   }
 387
 388   canMove([x, y], piece) {
 389     const color = this.getColor(x, y);
 390     const oppCol = V.GetOppCol(color);
 391     piece = piece || this.getPiece(x, y);
 392     if (piece == V.PAWN) {
 393       const forward = (color == 'w' ? -1 : 1);
 394       return (
 395         V.OnBoard(x + forward, y) &&
 396         (
 397           this.board[x + forward][y] == V.EMPTY ||
 398           (
 399             V.OnBoard(x + forward, y + 1) &&
 400             this.board[x + forward][y + 1] != V.EMPTY &&
 401             this.getColor[x + forward, y + 1] == oppCol
 402           ) ||
 403           (
 404             V.OnBoard(x + forward, y - 1) &&
 405             this.board[x + forward][y - 1] != V.EMPTY &&
 406             this.getColor[x + forward, y - 1] == oppCol
 407           )
 408         )
 409       );
 410     }
 411     // Checking one step is enough:
 412     const steps =
 413       [V.KING, V.QUEEN].includes(piece)
 414         ? V.steps[V.ROOK].concat(V.steps[V.BISHOP])
 415         : V.steps[piece];
 416     for (let step of steps) {
 417       const [i, j] = [x + step[0], y + step[1]];
 418       if (
 419         V.OnBoard(i, j) &&
 420         (this.board[i][j] == V.EMPTY || this.getColor(i, j) != color)
 421       ) {
 422         return true;
 423       }
 424     }
 425     return false;
 426   }
 427
 428   // Apply mushroom, bomb or banana effect (hidden to the player).
 429   // Determine egg effect, too, and apply its first part if possible.
 430   getBasicMove_aux(psq1, sq2, tr, initMove) {
 431     const [x1, y1] = [psq1.x, psq1.y];
 432     const color1 = this.turn;
 433     const piece1 = (!!tr ? tr.p : (psq1.p || this.getPiece(x1, y1)));
 434     const oppCol = V.GetOppCol(color1);
 435     if (!sq2) {
 436       let move = {
 437         appear: [],
 438         vanish: []
 439       };
 440       // banana or bomb defines next square, or the move ends there
 441       move.appear = [
 442         new PiPo({
 443           x: x1,
 444           y: y1,
 445           c: color1,
 446           p: piece1
 447         })
 448       ];
 449       if (this.board[x1][y1] != V.EMPTY) {
 450         const initP1 = this.getPiece(x1, y1);
 451         move.vanish = [
 452           new PiPo({
 453             x: x1,
 454             y: y1,
 455             c: this.getColor(x1, y1),
 456             p: initP1
 457           })
 458         ];
 459         if ([V.BANANA, V.BOMB].includes(initP1)) {
 460           const steps = V.steps[initP1 == V.BANANA ? V.ROOK : V.BISHOP];
 461           move.next = this.getRandomSquare([x1, y1], steps);
 462         }
 463       }
 464       move.end = { x: x1, y: y1 };
 465       return move;
 466     }
 467     const [x2, y2] = [sq2[0], sq2[1]];
 468     // The move starts normally, on board:
 469     let move = super.getBasicMove([x1, y1], [x2, y2], tr);
 470     if (!!tr) move.promoteInto = tr.c + tr.p; //in case of (chomped...)
 471     const L = this.firstMove.length;
 472     if (
 473       [V.PAWN, V.KNIGHT].includes(piece1) &&
 474       !!initMove &&
 475       (this.subTurn == 1 || this.firstMove[L-1].end.effect == "daisy")
 476     ) {
 477       switch (piece1) {
 478         case V.PAWN: {
 479           const twoSquaresMove = (Math.abs(x2 - x1) == 2);
 480           const mushroomX = x1 + (twoSquaresMove ? (x2 - x1) / 2 : 0);
 481           move.appear.push(
 482             new PiPo({
 483               x: mushroomX,
 484               y: y1,
 485               c: 'a',
 486               p: V.MUSHROOM
 487             })
 488           );
 489           if (this.getColor(mushroomX, y1) == 'a') {
 490             move.vanish.push(
 491               new PiPo({
 492                 x: mushroomX,
 493                 y: y1,
 494                 c: 'a',
 495                 p: this.getPiece(mushroomX, y1)
 496               })
 497             );
 498           }
 499           break;
 500         }
 501         case V.KNIGHT: {
 502           const deltaX = Math.abs(x2 - x1);
 503           const deltaY = Math.abs(y2 - y1);
 504           let eggSquare = [
 505             x1 + (deltaX == 2 ? (x2 - x1) / 2 : 0),
 506             y1 + (deltaY == 2 ? (y2 - y1) / 2 : 0)
 507           ];
 508           if (
 509             this.board[eggSquare[0]][eggSquare[1]] != V.EMPTY &&
 510             this.getColor(eggSquare[0], eggSquare[1]) != 'a'
 511           ) {
 512             eggSquare[0] = x1;
 513             eggSquare[1] = y1;
 514           }
 515           move.appear.push(
 516             new PiPo({
 517               x: eggSquare[0],
 518               y: eggSquare[1],
 519               c: 'a',
 520               p: V.EGG
 521             })
 522           );
 523           if (this.getColor(eggSquare[0], eggSquare[1]) == 'a') {
 524             move.vanish.push(
 525               new PiPo({
 526                 x: eggSquare[0],
 527                 y: eggSquare[1],
 528                 c: 'a',
 529                 p: this.getPiece(eggSquare[0], eggSquare[1])
 530               })
 531             );
 532           }
 533           break;
 534         }
 535       }
 536     }
 537     // For (wa)luigi effect:
 538     const changePieceColor = (color) => {
 539       let pieces = [];
 540       const oppLastRank = (color == 'w' ? 7 : 0);
 541       for (let i=0; i<8; i++) {
 542         for (let j=0; j<8; j++) {
 543           if (
 544             (i != move.vanish[0].x || j != move.vanish[0].y) &&
 545             this.board[i][j] != V.EMPTY &&
 546             this.getColor(i, j) == color
 547           ) {
 548             const piece = this.getPiece(i, j);
 549             if (piece != V.KING && (piece != V.PAWN || i != oppLastRank))
 550               pieces.push({ x: i, y: j, p: piece });
 551           }
 552         }
 553       }
 554       // Special case of the current piece (still at its initial position)
 555       if (color == color1)
 556         pieces.push({ x: move.appear[0].x, y: move.appear[0].y, p: piece1 });
 557       const cp = pieces[randInt(pieces.length)];
 558       if (move.appear[0].x != cp.x || move.appear[0].y != cp.y) {
 559         move.vanish.push(
 560           new PiPo({
 561             x: cp.x,
 562             y: cp.y,
 563             c: color,
 564             p: cp.p
 565           })
 566         );
 567       }
 568       else move.appear.shift();
 569       move.appear.push(
 570         new PiPo({
 571           x: cp.x,
 572           y: cp.y,
 573           c: V.GetOppCol(color),
 574           p: cp.p
 575         })
 576       );
 577     };
 578     const applyEggEffect = () => {
 579       if (this.subTurn == 2)
 580         // No egg effects at subTurn 2
 581         return;
 582       // 1) Determine the effect (some may be impossible)
 583       let effects = ["kingboo", "koopa", "chomp", "bowser"];
 584       if (Object.values(this.captured[color1]).some(c => c >= 1))
 585         effects.push("toadette");
 586       const lastRank = { 'w': 0, 'b': 7 };
 587       let canPlayAgain = undefined;
 588       if (
 589         move.appear[0].p == V.PAWN &&
 590         move.appear[0].x == lastRank[color1]
 591       ) {
 592         // Always possible: promote into a queen, rook or king
 593         canPlayAgain = true;
 594       }
 595       else {
 596         move.end.effect = "daisy";
 597         V.PlayOnBoard(this.board, move);
 598         const square = [move.appear[0].x, move.appear[0].y];
 599         canPlayAgain = this.canMove(square, piece1);
 600         V.UndoOnBoard(this.board, move);
 601         delete move.end["effect"];
 602       }
 603       if (canPlayAgain) effects.push("daisy");
 604       if (
 605         this.board.some((b,i) =>
 606           b.some(cell => {
 607             return (
 608               cell[0] == oppCol &&
 609               cell[1] != V.KING &&
 610               (cell[1] != V.PAWN || i != lastRank[color1])
 611             );
 612           })
 613         )
 614       ) {
 615         effects.push("luigi");
 616       }
 617       if (
 618         (
 619           piece1 != V.KING &&
 620           (piece1 != V.PAWN || move.appear[0].x != lastRank[oppCol])
 621         ) ||
 622         this.board.some((b,i) =>
 623           b.some(cell => {
 624             return (
 625               cell[0] == color1 &&
 626               cell[1] != V.KING &&
 627               (cell[1] != V.PAWN || i != lastRank[oppCol])
 628             );
 629           })
 630         )
 631       ) {
 632         effects.push("waluigi");
 633       }
 634       const effect = effects[randInt(effects.length)];
 635       move.end.effect = effect;
 636       // 2) Apply it if possible
 637       if (!(["kingboo", "toadette", "daisy"].includes(effect))) {
 638         switch (effect) {
 639           case "koopa":
 640             move.appear = [];
 641             // Maybe egg effect was applied after others,
 642             // so just shift vanish array:
 643             move.vanish.shift();
 644             break;
 645           case "chomp":
 646             move.appear = [];
 647             break;
 648           case "bowser":
 649             move.appear[0].p = V.IMMOBILIZE_CODE[piece1];
 650             break;
 651           case "luigi":
 652             changePieceColor(oppCol);
 653             break;
 654           case "waluigi":
 655             changePieceColor(color1);
 656             break;
 657         }
 658       }
 659     };
 660     const applyMushroomEffect = () => {
 661       if ([V.PAWN, V.KING, V.KNIGHT].includes(piece1)) {
 662         // Just make another similar step, if possible (non-capturing)
 663         const [i, j] = [
 664           move.appear[0].x + (x2 - x1),
 665           move.appear[0].y + (y2 - y1)
 666         ];
 667         if (
 668           V.OnBoard(i, j) &&
 669           (this.board[i][j] == V.EMPTY || this.getColor(i, j) == 'a')
 670         ) {
 671           move.appear[0].x = i;
 672           move.appear[0].y = j;
 673           if (this.board[i][j] != V.EMPTY) {
 674             const object = this.getPiece(i, j);
 675             move.vanish.push(
 676               new PiPo({
 677                 x: i,
 678                 y: j,
 679                 c: 'a',
 680                 p: object
 681               })
 682             );
 683             switch (object) {
 684               case V.BANANA:
 685               case V.BOMB:
 686                 const steps = V.steps[object == V.BANANA ? V.ROOK : V.BISHOP];
 687                 move.next = this.getRandomSquare([i, j], steps);
 688                 break;
 689               case V.EGG:
 690                 applyEggEffect();
 691                 break;
 692               case V.MUSHROOM:
 693                 applyMushroomEffect();
 694                 break;
 695             }
 696           }
 697         }
 698       }
 699       else {
 700         // Queen, bishop or rook:
 701         const step = [
 702           (x2 - x1) / Math.abs(x2 - x1) || 0,
 703           (y2 - y1) / Math.abs(y2 - y1) || 0
 704         ];
 705         const next = [move.appear[0].x + step[0], move.appear[0].y + step[1]];
 706         if (
 707           V.OnBoard(next[0], next[1]) &&
 708           this.board[next[0]][next[1]] != V.EMPTY &&
 709           this.getColor(next[0], next[1]) != 'a'
 710         ) {
 711           const afterNext = [next[0] + step[0], next[1] + step[1]];
 712           if (V.OnBoard(afterNext[0], afterNext[1])) {
 713             const afterColor = this.getColor(afterNext[0], afterNext[1])
 714             if (
 715               this.board[afterNext[0]][afterNext[1]] == V.EMPTY ||
 716               afterColor != color1
 717             ) {
 718               move.appear[0].x = afterNext[0];
 719               move.appear[0].y = afterNext[1];
 720               if (this.board[afterNext[0]][afterNext[1]] != V.EMPTY) {
 721                 // The "object" could also be an opponent's piece
 722                 const object = this.getPiece(afterNext[0], afterNext[1]);
 723                 move.vanish.push(
 724                   new PiPo({
 725                     x: afterNext[0],
 726                     y: afterNext[1],
 727                     c: afterColor,
 728                     p: object
 729                   })
 730                 );
 731                 switch (object) {
 732                   case V.BANANA:
 733                   case V.BOMB:
 734                     const steps =
 735                       V.steps[object == V.BANANA ? V.ROOK : V.BISHOP];
 736                     move.next = this.getRandomSquare(
 737                       [afterNext[0], afterNext[1]], steps);
 738                     break;
 739                   case V.EGG:
 740                     applyEggEffect();
 741                     break;
 742                   case V.MUSHROOM:
 743                     applyMushroomEffect();
 744                     break;
 745                 }
 746               }
 747             }
 748           }
 749         }
 750       }
 751     };
 752     const color2 = this.getColor(x2, y2);
 753     const piece2 = this.getPiece(x2, y2);
 754     if (color2 == 'a') {
 755       switch (piece2) {
 756         case V.BANANA:
 757         case V.BOMB:
 758           const steps = V.steps[piece2 == V.BANANA ? V.ROOK : V.BISHOP];
 759           move.next = this.getRandomSquare([x2, y2], steps);
 760           break;
 761         case V.MUSHROOM:
 762           applyMushroomEffect();
 763           break;
 764         case V.EGG:
 765           if (this.subTurn == 1)
 766             // No egg effect at subTurn 2
 767             applyEggEffect();
 768           break;
 769       }
 770     }
 771     if (
 772       this.subTurn == 1 &&
 773       !move.next &&
 774       move.appear.length > 0 &&
 775       [V.ROOK, V.BISHOP].includes(piece1)
 776     ) {
 777       const finalSquare = [move.appear[0].x, move.appear[0].y];
 778       if (
 779         color2 != 'a' ||
 780         this.getColor(finalSquare[0], finalSquare[1]) != 'a' ||
 781         this.getPiece(finalSquare[0], finalSquare[1]) != V.EGG
 782       ) {
 783         const validSteps =
 784           V.steps[piece1 == V.ROOK ? V.BISHOP : V.ROOK].filter(s => {
 785             const [i, j] = [finalSquare[0] + s[0], finalSquare[1] + s[1]];
 786             return (
 787               V.OnBoard(i, j) &&
 788               (this.board[i][j] == V.EMPTY || this.getColor(i, j) == 'a')
 789             );
 790           });
 791         if (validSteps.length >= 1) {
 792           const [x, y] = [
 793             finalSquare[0] + validSteps[0][0],
 794             finalSquare[1] + validSteps[0][1]
 795           ];
 796           move.appear.push(
 797             new PiPo({
 798               x: x,
 799               y: y,
 800               c: 'a',
 801               p: (piece1 == V.ROOK ? V.BANANA : V.BOMB)
 802             })
 803           );
 804           if (this.board[x][y] != V.EMPTY) {
 805             move.vanish.push(
 806               new PiPo({ x: x, y: y, c: 'a', p: this.getPiece(x, y) }));
 807           }
 808         }
 809       }
 810     }
 811     return move;
 812   }
 813
 814   getBasicMove(psq1, sq2, tr) {
 815     let moves = [];
 816     if (Array.isArray(psq1)) psq1 = { x: psq1[0], y: psq1[1] };
 817     let m = this.getBasicMove_aux(psq1, sq2, tr, "initMove");
 818     while (!!m.next) {
 819       // Last move ended on bomb or banana, direction change
 820       V.PlayOnBoard(this.board, m);
 821       moves.push(m);
 822       m = this.getBasicMove_aux(
 823         { x: m.appear[0].x, y: m.appear[0].y }, m.next);
 824     }
 825     for (let i=moves.length-1; i>=0; i--) V.UndoOnBoard(this.board, moves[i]);
 826     moves.push(m);
 827     // Now merge moves into one
 828     let move = {};
 829     // start is wrong for Toadette moves --> it's fixed later
 830     move.start = { x: psq1.x, y: psq1.y };
 831     move.end = !!sq2 ? { x: sq2[0], y: sq2[1] } : { x: psq1.x, y: psq1.y };
 832     if (!!tr) move.promoteInto = moves[0].promoteInto;
 833     let lm = moves[moves.length-1];
 834     if (this.subTurn == 1 && !!lm.end.effect)
 835       move.end.effect = lm.end.effect;
 836     if (moves.length == 1) {
 837       move.appear = moves[0].appear;
 838       move.vanish = moves[0].vanish;
 839     }
 840     else {
 841       // Keep first vanish and last appear (if any)
 842       move.appear = lm.appear;
 843       move.vanish = moves[0].vanish;
 844       if (
 845         move.vanish.length >= 1 &&
 846         move.appear.length >= 1 &&
 847         move.vanish[0].x == move.appear[0].x &&
 848         move.vanish[0].y == move.appear[0].y
 849       ) {
 850         // Loopback on initial square:
 851         move.vanish.shift();
 852         move.appear.shift();
 853       }
 854       for (let i=1; i < moves.length - 1; i++) {
 855         for (let v of moves[i].vanish) {
 856           // Only vanishing objects, not appearing at init move
 857           if (
 858             v.c == 'a' &&
 859             (
 860               moves[0].appear.length == 1 ||
 861               moves[0].appear[1].x != v.x ||
 862               moves[0].appear[1].y != v.y
 863             )
 864           ) {
 865             move.vanish.push(v);
 866           }
 867         }
 868       }
 869       // Final vanish is our piece, but others might be relevant
 870       // (for some egg bonuses at least).
 871       for (let i=1; i < lm.vanish.length; i++) {
 872         if (
 873           lm.vanish[i].c != 'a' ||
 874           moves[0].appear.length == 1 ||
 875           moves[0].appear[1].x != lm.vanish[i].x ||
 876           moves[0].appear[1].y != lm.vanish[i].y
 877         ) {
 878           move.vanish.push(lm.vanish[i]);
 879         }
 880       }
 881     }
 882     return move;
 883   }
 884
 885   getPotentialPawnMoves([x, y]) {
 886     const color = this.turn;
 887     const oppCol = V.GetOppCol(color);
 888     const [sizeX, sizeY] = [V.size.x, V.size.y];
 889     const shiftX = V.PawnSpecs.directions[color];
 890     const firstRank = (color == "w" ? sizeX - 1 : 0);
 891     let moves = [];
 892     if (
 893       this.board[x + shiftX][y] == V.EMPTY ||
 894       this.getColor(x + shiftX, y) == 'a'
 895     ) {
 896       this.addPawnMoves([x, y], [x + shiftX, y], moves);
 897       if (
 898         [firstRank, firstRank + shiftX].includes(x) &&
 899         (
 900           this.board[x + 2 * shiftX][y] == V.EMPTY ||
 901           this.getColor(x + 2 * shiftX, y) == 'a'
 902         )
 903       ) {
 904         moves.push(this.getBasicMove({ x: x, y: y }, [x + 2 * shiftX, y]));
 905       }
 906     }
 907     for (let shiftY of [-1, 1]) {
 908       if (
 909         y + shiftY >= 0 &&
 910         y + shiftY < sizeY &&
 911         this.board[x + shiftX][y + shiftY] != V.EMPTY &&
 912         ['a', oppCol].includes(this.getColor(x + shiftX, y + shiftY))
 913       ) {
 914         this.addPawnMoves([x, y], [x + shiftX, y + shiftY], moves);
 915       }
 916     }
 917     return moves;
 918   }
 919
 920   getPotentialQueenMoves(sq) {
 921     const normalMoves = super.getPotentialQueenMoves(sq);
 922     // If flag allows it, add 'invisible movements'
 923     let invisibleMoves = [];
 924     if (this.powerFlags[this.turn][V.QUEEN]) {
 925       normalMoves.forEach(m => {
 926         if (
 927           m.appear.length == 1 &&
 928           m.vanish.length == 1 &&
 929           // Only simple non-capturing moves:
 930           m.vanish[0].c != 'a'
 931         ) {
 932           let im = JSON.parse(JSON.stringify(m));
 933           im.appear[0].p = V.INVISIBLE_QUEEN;
 934           im.end.noHighlight = true;
 935           invisibleMoves.push(im);
 936         }
 937       });
 938     }
 939     return normalMoves.concat(invisibleMoves);
 940   }
 941
 942   getPotentialKingMoves([x, y]) {
 943     let moves = super.getPotentialKingMoves([x, y]);
 944     const color = this.turn;
 945     // If flag allows it, add 'remote shell captures'
 946     if (this.powerFlags[this.turn][V.KING]) {
 947       V.steps[V.ROOK].concat(V.steps[V.BISHOP]).forEach(step => {
 948         const [nextX, nextY] = [x + step[0], y + step[1]];
 949         if (
 950           V.OnBoard(nextX, nextY) &&
 951           (
 952             this.board[nextX][nextY] == V.EMPTY ||
 953             (
 954               this.getColor(nextX, nextY) == 'a' &&
 955               [V.EGG, V.MUSHROOM].includes(this.getPiece(nextX, nextY))
 956             )
 957           )
 958         ) {
 959           let [i, j] = [x + 2 * step[0], y + 2 * step[1]];
 960           while (
 961             V.OnBoard(i, j) &&
 962             (
 963               this.board[i][j] == V.EMPTY ||
 964               (
 965                 this.getColor(i, j) == 'a' &&
 966                 [V.EGG, V.MUSHROOM].includes(this.getPiece(i, j))
 967               )
 968             )
 969           ) {
 970             i += step[0];
 971             j += step[1];
 972           }
 973           if (V.OnBoard(i, j)) {
 974             const colIJ = this.getColor(i, j);
 975             if (colIJ != color) {
 976               // May just destroy a bomb or banana:
 977               moves.push(
 978                 new Move({
 979                   start: { x: x, y: y},
 980                   end: { x: i, y: j },
 981                   appear: [],
 982                   vanish: [
 983                     new PiPo({
 984                       x: i, y: j, c: colIJ, p: this.getPiece(i, j)
 985                     })
 986                   ]
 987                 })
 988               );
 989             }
 990           }
 991         }
 992       });
 993     }
 994     return moves;
 995   }
 996
 997   getSlideNJumpMoves([x, y], steps, oneStep) {
 998     let moves = [];
 999     outerLoop: for (let step of steps) {
1000       let i = x + step[0];
1001       let j = y + step[1];
1002       while (
1003         V.OnBoard(i, j) &&
1004         (
1005           this.board[i][j] == V.EMPTY ||
1006           this.getPiece(i, j) == V.INVISIBLE_QUEEN ||
1007           (
1008             this.getColor(i, j) == 'a' &&
1009             [V.EGG, V.MUSHROOM].includes(this.getPiece(i, j))
1010           )
1011         )
1012       ) {
1013         moves.push(this.getBasicMove({ x: x, y: y }, [i, j]));
1014         if (oneStep) continue outerLoop;
1015         i += step[0];
1016         j += step[1];
1017       }
1018       if (V.OnBoard(i, j) && this.canTake([x, y], [i, j]))
1019         moves.push(this.getBasicMove({ x: x, y: y }, [i, j]));
1020     }
1021     return moves;
1022   }
1023
1024   getAllPotentialMoves() {
1025     if (this.subTurn == 1) return super.getAllPotentialMoves();
1026     let moves = [];
1027     const L = this.firstMove.length;
1028     const fm = this.firstMove[L-1];
1029     switch (fm.end.effect) {
1030       case 0:
1031         moves.push({
1032           start: { x: -1, y: -1 },
1033           end: { x: -1, y: -1 },
1034           appear: [],
1035           vanish: []
1036         });
1037         for (
1038           let step of
1039           (fm.vanish[0].p == V.ROOK ? V.steps[V.BISHOP] : V.steps[V.ROOK])
1040         ) {
1041           const [i, j] = [fm.appear[0].x + step[0], fm.appear[0].y + step[1]];
1042           if (
1043             V.OnBoard(i, j) &&
1044             (this.board[i][j] == V.EMPTY || this.getColor(i, j) == 'a')
1045           ) {
1046             let m = new Move({
1047               start: { x: -1, y: -1 },
1048               end: { x: i, y: j },
1049               appear: [
1050                 new PiPo({
1051                   x: i,
1052                   y: j,
1053                   c: 'a',
1054                   p: (fm.vanish[0].p == V.ROOK ? V.BANANA : V.BOMB)
1055                 })
1056               ],
1057               vanish: []
1058             });
1059             if (this.board[i][j] != V.EMPTY) {
1060               m.vanish.push(
1061                 new PiPo({ x: i, y: j, c: 'a', p: this.getPiece(i, j) }));
1062             }
1063             moves.push(m);
1064           }
1065         }
1066         break;
1067       case "kingboo": {
1068         const [x, y] = [fm.appear[0].x, fm.appear[0].y];
1069         for (let i=0; i<8; i++) {
1070           for (let j=0; j<8; j++) {
1071             const colIJ = this.getColor(i, j);
1072             if (
1073               i != x &&
1074               j != y &&
1075               this.board[i][j] != V.EMPTY &&
1076               colIJ != 'a'
1077             ) {
1078               const movedUnit = new PiPo({
1079                 x: x,
1080                 y: y,
1081                 c: colIJ,
1082                 p: this.getPiece(i, j)
1083               });
1084               let mMove = this.getBasicMove({ x: x, y: y }, [i, j]);
1085               mMove.appear.push(movedUnit);
1086               moves.push(mMove);
1087             }
1088           }
1089         }
1090         break;
1091       }
1092       case "toadette": {
1093         const x = V.size.x + (this.turn == 'w' ? 0 : 1);
1094         for (let y = 0; y < 8; y++)
1095           Array.prototype.push.apply(moves, this.getReserveMoves([x, y]));
1096         break;
1097       }
1098       case "daisy":
1099         moves = super.getPotentialMovesFrom([fm.appear[0].x, fm.appear[0].y]);
1100         break;
1101     }
1102     return moves;
1103   }
1104
1105   doClick(square) {
1106     const L = this.firstMove.length;
1107     const fm = (L > 0 ? this.firstMove[L-1] : null);
1108     if (
1109       isNaN(square[0]) ||
1110       this.subTurn == 1 ||
1111       !([0, "daisy"].includes(fm.end.effect))
1112     ) {
1113       return null;
1114     }
1115     const [x, y] = [square[0], square[1]];
1116     const deltaX = Math.abs(fm.appear[0].x - x);
1117     const deltaY = Math.abs(fm.appear[0].y - y);
1118     if (
1119       fm.end.effect == 0 &&
1120       (this.board[x][y] == V.EMPTY || this.getColor(x, y) == 'a') &&
1121       (
1122         (fm.vanish[0].p == V.ROOK && deltaX == 1 && deltaY == 1) ||
1123         (fm.vanish[0].p == V.BISHOP && deltaX + deltaY == 1)
1124       )
1125     ) {
1126       let m = new Move({
1127         start: { x: -1, y: -1 },
1128         end: { x: x, y: y },
1129         appear: [
1130           new PiPo({
1131             x: x,
1132             y: y,
1133             c: 'a',
1134             p: (fm.vanish[0].p == V.ROOK ? V.BANANA : V.BOMB)
1135           })
1136         ],
1137         vanish: []
1138       });
1139       if (this.board[x][y] != V.EMPTY) {
1140         m.vanish.push(
1141           new PiPo({ x: x, y: y, c: 'a', p: this.getPiece(x, y) }));
1142       }
1143       return m;
1144     }
1145     else if (
1146       fm.end.effect == "daisy" &&
1147       deltaX == 0 && deltaY == 0 &&
1148       !this.canMove([x, y])
1149     ) {
1150       // No possible move: return empty move
1151       return {
1152         start: { x: -1, y: -1 },
1153         end: { x: -1, y: -1 },
1154         appear: [],
1155         vanish: []
1156       };
1157     }
1158     return null;
1159   }
1160
1161   play(move) {
1162 //    if (!this.states) this.states = [];
1163 //    const stateFen = this.getFen();
1164 //    this.states.push(stateFen);
1165
1166     move.flags = JSON.stringify(this.aggregateFlags());
1167     V.PlayOnBoard(this.board, move);
1168     move.turn = [this.turn, this.subTurn];
1169     if ([0, "kingboo", "toadette", "daisy"].includes(move.end.effect)) {
1170       this.firstMove.push(move);
1171       this.subTurn = 2;
1172     }
1173     else {
1174       this.turn = V.GetOppCol(this.turn);
1175       this.movesCount++;
1176       this.subTurn = 1;
1177     }
1178     this.postPlay(move);
1179   }
1180
1181   postPlay(move) {
1182     if (move.end.effect == "toadette") this.reserve = this.captured;
1183     else this.reserve = undefined;
1184     const color = move.turn[0];
1185     if (move.vanish.length == 2 && move.vanish[1].c != 'a') {
1186       // Capture: update this.captured
1187       let capturedPiece = move.vanish[1].p;
1188       if (capturedPiece == V.INVISIBLE_QUEEN) capturedPiece = V.QUEEN;
1189       else if (Object.keys(V.IMMOBILIZE_DECODE).includes(capturedPiece))
1190         capturedPiece = V.IMMOBILIZE_DECODE[capturedPiece];
1191       this.captured[move.vanish[1].c][capturedPiece]++;
1192     }
1193     else if (move.vanish.length == 0) {
1194       if (move.appear.length == 0 || move.appear[0].c == 'a') return;
1195       // A piece is back on board
1196       this.captured[move.appear[0].c][move.appear[0].p]--;
1197     }
1198     if (move.appear.length == 0) {
1199       // Three cases: king "shell capture", Chomp or Koopa
1200       if (this.getPiece(move.start.x, move.start.y) == V.KING)
1201         // King remote capture:
1202         this.powerFlags[color][V.KING] = false;
1203       else if (move.end.effect == "chomp")
1204         this.captured[color][move.vanish[0].p]++;
1205     }
1206     else if (move.appear[0].p == V.INVISIBLE_QUEEN)
1207       this.powerFlags[move.appear[0].c][V.QUEEN] = false;
1208     if (this.subTurn == 2) return;
1209     if (
1210       move.turn[1] == 1 &&
1211       move.appear.length == 0 ||
1212       !(Object.keys(V.IMMOBILIZE_DECODE).includes(move.appear[0].p))
1213     ) {
1214       // Look for an immobilized piece of my color: it can now move
1215       for (let i=0; i<8; i++) {
1216         for (let j=0; j<8; j++) {
1217           if (this.board[i][j] != V.EMPTY) {
1218             const piece = this.getPiece(i, j);
1219             if (
1220               this.getColor(i, j) == color &&
1221               Object.keys(V.IMMOBILIZE_DECODE).includes(piece)
1222             ) {
1223               this.board[i][j] = color + V.IMMOBILIZE_DECODE[piece];
1224               move.wasImmobilized = [i, j];
1225             }
1226           }
1227         }
1228       }
1229     }
1230     // Also make opponent invisible queen visible again, if any
1231     const oppCol = V.GetOppCol(color);
1232     for (let i=0; i<8; i++) {
1233       for (let j=0; j<8; j++) {
1234         if (
1235           this.board[i][j] != V.EMPTY &&
1236           this.getColor(i, j) == oppCol &&
1237           this.getPiece(i, j) == V.INVISIBLE_QUEEN
1238         ) {
1239           this.board[i][j] = oppCol + V.QUEEN;
1240           move.wasInvisible = [i, j];
1241         }
1242       }
1243     }
1244   }
1245
1246   undo(move) {
1247     this.disaggregateFlags(JSON.parse(move.flags));
1248     V.UndoOnBoard(this.board, move);
1249     if ([0, "kingboo", "toadette", "daisy"].includes(move.end.effect))
1250       this.firstMove.pop();
1251     else this.movesCount--;
1252     this.turn = move.turn[0];
1253     this.subTurn = move.turn[1];
1254     this.postUndo(move);
1255
1256 //    const stateFen = this.getFen();
1257 //    if (stateFen != this.states[this.states.length-1]) debugger;
1258 //    this.states.pop();
1259   }
1260
1261   postUndo(move) {
1262     if (!!move.wasImmobilized) {
1263       const [i, j] = move.wasImmobilized;
1264       this.board[i][j] =
1265         this.getColor(i, j) + V.IMMOBILIZE_CODE[this.getPiece(i, j)];
1266     }
1267     if (!!move.wasInvisible) {
1268       const [i, j] = move.wasInvisible;
1269       this.board[i][j] = this.getColor(i, j) + V.INVISIBLE_QUEEN;
1270     }
1271     if (move.vanish.length == 2 && move.vanish[1].c != 'a') {
1272       let capturedPiece = move.vanish[1].p;
1273       if (capturedPiece == V.INVISIBLE_QUEEN) capturedPiece = V.QUEEN;
1274       else if (Object.keys(V.IMMOBILIZE_DECODE).includes(capturedPiece))
1275         capturedPiece = V.IMMOBILIZE_DECODE[capturedPiece];
1276       this.captured[move.vanish[1].c][capturedPiece]--;
1277     }
1278     else if (move.vanish.length == 0) {
1279       if (move.appear.length == 0 || move.appear[0].c == 'a') return;
1280       // A piece was back on board
1281       this.captured[move.appear[0].c][move.appear[0].p]++;
1282     }
1283     else if (move.appear.length == 0 && move.end.effect == "chomp")
1284       this.captured[move.vanish[0].c][move.vanish[0].p]--;
1285     if (move.vanish.length == 0) this.reserve = this.captured;
1286     else this.reserve = undefined;
1287   }
1288
1289   getCheckSquares() {
1290     return [];
1291   }
1292
1293   getCurrentScore() {
1294     // Find kings (not tracked in this variant)
1295     let kingThere = { w: false, b: false };
1296     for (let i=0; i<8; i++) {
1297       for (let j=0; j<8; j++) {
1298         if (
1299           this.board[i][j] != V.EMPTY &&
1300           ['k', 'l'].includes(this.getPiece(i, j))
1301         ) {
1302           kingThere[this.getColor(i, j)] = true;
1303         }
1304       }
1305     }
1306     if (!kingThere['w']) return "0-1";
1307     if (!kingThere['b']) return "1-0";
1308     if (!this.atLeastOneMove()) return (this.turn == 'w' ? "0-1" : "1-0");
1309     return "*";
1310   }
1311
1312   static GenRandInitFen(randomness) {
1313     return (
1314       SuicideRules.GenRandInitFen(randomness).slice(0, -1) +
1315       // Add Peach + Mario flags + capture counts
1316       "1111 000000000000"
1317     );
1318   }
1319
1320   filterValid(moves) {
1321     return moves;
1322   }
1323
1324   static get VALUES() {
1325     return Object.assign(
1326       {},
1327       ChessRules.VALUES,
1328       {
1329         s: 1,
1330         u: 5,
1331         o: 3,
1332         c: 3,
1333         t: 9,
1334         l: 1000,
1335         e: 0,
1336         d: 0,
1337         w: 0,
1338         m: 0
1339       }
1340     );
1341   }
1342
1343   static get SEARCH_DEPTH() {
1344     return 1;
1345   }
1346
1347   getComputerMove() {
1348     const moves = this.getAllValidMoves();
1349     // Split into "normal" and "random" moves:
1350     // (Next splitting condition is OK because cannot take self object
1351     // without a banana or bomb on the way).
1352     const deterministicMoves = moves.filter(m => {
1353       return m.vanish.every(a => a.c != 'a' || a.p == V.MUSHROOM);
1354     });
1355     const randomMoves = moves.filter(m => {
1356       return m.vanish.some(a => a.c == 'a' && a.p != V.MUSHROOM);
1357     });
1358     if (Math.random() < deterministicMoves.length / randomMoves.length)
1359       // Play a deterministic one: capture king or material if possible
1360       return super.getComputerMove(deterministicMoves);
1361     // Play a random effect move, at random:
1362     let move1 = randomMoves[randInt(randomMoves.length)];
1363     this.play(move1);
1364     let move2 = undefined;
1365     if (this.subTurn == 2) {
1366       const moves2 = this.getAllValidMoves();
1367       move2 = moves2[randInt(moves2.length)];
1368     }
1369     this.undo(move1);
1370     if (!move2) return move1;
1371     return [move1, move2];
1372   }
1373
1374   getNotation(move) {
1375     if (move.vanish.length == 0 && move.appear.length == 0) return "-";
1376     if (
1377       !move.end.effect &&
1378       move.appear.length > 0 &&
1379       move.appear[0].p == V.INVISIBLE_QUEEN
1380     ) {
1381       return "Q??";
1382     }
1383     const finalSquare = V.CoordsToSquare(move.end);
1384     // Next condition also includes Toadette placements:
1385     if (move.appear.length > 0 && move.vanish.every(a => a.c == 'a')) {
1386       const piece =
1387         move.appear[0].p != V.PAWN ? move.appear[0].p.toUpperCase() : "";
1388       return piece + "@" + finalSquare;
1389     }
1390     else if (move.appear.length == 0) {
1391       const piece = this.getPiece(move.start.x, move.start.y);
1392       if (piece == V.KING && !move.end.effect)
1393         // King remote capture
1394         return "Kx" + finalSquare;
1395       // Koopa or Chomp, or loopback after bananas, bombs & mushrooms:
1396       return (
1397         piece.toUpperCase() + "x" + finalSquare +
1398         (
1399           !!move.end.effect
1400             ? "*" + (move.end.effect == "koopa" ? "K" : "C")
1401             : ""
1402         )
1403       );
1404     }
1405     if (move.appear.length == 1 && move.vanish.length == 1) {
1406       const moveStart = move.appear[0].p.toUpperCase() + "@";
1407       if (move.appear[0].c == 'a' && move.vanish[0].c == 'a')
1408         // Bonus replacement:
1409         return moveStart + finalSquare;
1410       if (
1411         move.vanish[0].p == V.INVISIBLE_QUEEN &&
1412         move.appear[0].x == move.vanish[0].x &&
1413         move.appear[0].y == move.vanish[0].y
1414       ) {
1415         // Toadette takes invisible queen
1416         return moveStart + "Q" + finalSquare;
1417       }
1418     }
1419     if (
1420       move.appear.length == 2 &&
1421       move.vanish.length == 2 &&
1422       move.appear.every(a => a.c != 'a') &&
1423       move.vanish.every(v => v.c != 'a')
1424     ) {
1425       // King Boo exchange
1426       return move.vanish[1].p.toUpperCase() + finalSquare;
1427     }
1428     const piece = move.vanish[0].p;
1429     let notation = undefined;
1430     if (piece == V.PAWN) {
1431       // Pawn move
1432       if (move.vanish.length >= 2) {
1433         // Capture
1434         const startColumn = V.CoordToColumn(move.start.y);
1435         notation = startColumn + "x" + finalSquare;
1436       }
1437       else notation = finalSquare;
1438       if (move.appear[0].p != V.PAWN)
1439         // Promotion
1440         notation += "=" + move.appear[0].p.toUpperCase();
1441     }
1442     else {
1443       notation =
1444         piece.toUpperCase() +
1445         (move.vanish.length >= 2 ? "x" : "") +
1446         finalSquare;
1447     }
1448     if (!!move.end.effect) {
1449       switch (move.end.effect) {
1450         case "kingboo":
1451           notation += "*B";
1452           break;
1453         case "toadette":
1454           notation += "*T";
1455           break;
1456         case "daisy":
1457           notation += "*D";
1458           break;
1459         case "bowser":
1460           notation += "*M";
1461           break;
1462         case "luigi":
1463         case "waluigi":
1464           const lastAppear = move.appear[move.appear.length - 1];
1465           const effectOn =
1466             V.CoordsToSquare({ x: lastAppear.x, y : lastAppear.y });
1467           notation += "*" + move.end.effect[0].toUpperCase() + effectOn;
1468           break;
1469       }
1470     }
1471     return notation;
1472   }
1473 };