New variant idea
[xogo.git] / variants / Dynamo / class.js
CommitLineData
66ab134b
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1import ChessRules from "/base_rules.js";
2
3export default class DynamoRules extends ChessRules {
4
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5 static get Options() {
6 // TODO
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7 }
8
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9 get hasEnpassant() {
10 return this.options["enpassant"];
11 }
66ab134b 12
939e06bf 13 canIplay(x, y) {
66ab134b 14 // Sometimes opponent's pieces can be moved directly
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15 return this.playerColor == this.turn;
16 }
17
18 canTake() {
19 // Captures don't occur (only pulls & pushes)
20 return false;
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21 }
22
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23 setOtherVariables(fenParsed) {
24 super.setOtherVariables(fenParsed);
66ab134b 25 this.subTurn = 1;
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26 // Last action format: e2h5/d1g4 for queen on d1 pushing pawn to h5
27 // for example, and moving herself to g4. If just move: e2h5
28 this.lastAction = [];
29 if (fenParsed.amove != '-') {
30 this.lastAction = fenParsed.amove.split('/').map(a => {
31 return {
32 c1: C.SquareToCoords(C.SquareFromUsual(a.substr(0, 2))),
33 c2: C.SquareToCoords(C.SquareFromUsual(a.substr(2, 2)))
34 };
66ab134b 35 });
66ab134b 36 }
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37 }
38
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39 getPartFen(o) {
40 let res = super.getPartFen(o);
41 if (o.init)
42 res["amove"] = '-';
43 else {
44 res["amove"] = this.lastAction.map(a => {
45 C.UsualFromSquare(C.CoordsToSquare(a.c1)) +
46 C.UsualFromSquare(C.CoordsToSquare(a.c2))
47 }).join('/');
66ab134b 48 }
939e06bf 49 return res;
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50 }
51
52 // Step is right, just add (push/pull) moves in this direction
53 // Direction is assumed normalized.
54 getMovesInDirection([x, y], [dx, dy], nbSteps) {
55 nbSteps = nbSteps || 8; //max 8 steps anyway
56 let [i, j] = [x + dx, y + dy];
57 let moves = [];
58 const color = this.getColor(x, y);
59 const piece = this.getPiece(x, y);
60 const lastRank = (color == 'w' ? 0 : 7);
61 let counter = 1;
62 while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
63 if (i == lastRank && piece == V.PAWN) {
64 // Promotion by push or pull
65 V.PawnSpecs.promotions.forEach(p => {
66 let move = super.getBasicMove([x, y], [i, j], { c: color, p: p });
67 moves.push(move);
68 });
69 }
70 else moves.push(super.getBasicMove([x, y], [i, j]));
71 if (++counter > nbSteps) break;
72 i += dx;
73 j += dy;
74 }
75 if (!V.OnBoard(i, j) && piece != V.KING) {
76 // Add special "exit" move, by "taking king"
77 moves.push(
78 new Move({
79 start: { x: x, y: y },
80 end: { x: this.kingPos[color][0], y: this.kingPos[color][1] },
81 appear: [],
82 vanish: [{ x: x, y: y, c: color, p: piece }]
83 })
84 );
85 }
86 return moves;
87 }
88
89 // Normalize direction to know the step
90 getNormalizedDirection([dx, dy]) {
91 const absDir = [Math.abs(dx), Math.abs(dy)];
92 let divisor = 0;
93 if (absDir[0] != 0 && absDir[1] != 0 && absDir[0] != absDir[1])
94 // Knight
95 divisor = Math.min(absDir[0], absDir[1]);
96 else
97 // Standard slider (or maybe a pawn or king: same)
98 divisor = Math.max(absDir[0], absDir[1]);
99 return [dx / divisor, dy / divisor];
100 }
101
102 // There was something on x2,y2, maybe our color, pushed or (self)pulled
103 isAprioriValidExit([x1, y1], [x2, y2], color2, piece2) {
104 const color1 = this.getColor(x1, y1);
105 const pawnShift = (color1 == 'w' ? -1 : 1);
106 const lastRank = (color1 == 'w' ? 0 : 7);
107 const deltaX = Math.abs(x1 - x2);
108 const deltaY = Math.abs(y1 - y2);
109 const checkSlider = () => {
110 const dir = this.getNormalizedDirection([x2 - x1, y2 - y1]);
111 let [i, j] = [x1 + dir[0], y1 + dir[1]];
112 while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
113 i += dir[0];
114 j += dir[1];
115 }
116 return !V.OnBoard(i, j);
117 };
118 switch (piece2 || this.getPiece(x1, y1)) {
119 case V.PAWN:
120 return (
121 x1 + pawnShift == x2 &&
122 (
123 (color1 == color2 && x2 == lastRank && y1 == y2) ||
124 (
125 color1 != color2 &&
126 deltaY == 1 &&
127 !V.OnBoard(2 * x2 - x1, 2 * y2 - y1)
128 )
129 )
130 );
131 case V.ROOK:
132 if (x1 != x2 && y1 != y2) return false;
133 return checkSlider();
134 case V.KNIGHT:
135 return (
136 deltaX + deltaY == 3 &&
137 (deltaX == 1 || deltaY == 1) &&
138 !V.OnBoard(2 * x2 - x1, 2 * y2 - y1)
139 );
140 case V.BISHOP:
141 if (deltaX != deltaY) return false;
142 return checkSlider();
143 case V.QUEEN:
144 if (deltaX != 0 && deltaY != 0 && deltaX != deltaY) return false;
145 return checkSlider();
146 case V.KING:
147 return (
148 deltaX <= 1 &&
149 deltaY <= 1 &&
150 !V.OnBoard(2 * x2 - x1, 2 * y2 - y1)
151 );
152 }
153 return false;
154 }
155
156 isAprioriValidVertical([x1, y1], x2) {
157 const piece = this.getPiece(x1, y1);
158 const deltaX = Math.abs(x1 - x2);
159 const startRank = (this.getColor(x1, y1) == 'w' ? 6 : 1);
160 return (
161 [V.QUEEN, V.ROOK].includes(piece) ||
162 (
163 [V.KING, V.PAWN].includes(piece) &&
164 (
165 deltaX == 1 ||
166 (deltaX == 2 && piece == V.PAWN && x1 == startRank)
167 )
168 )
169 );
170 }
171
172 // NOTE: for pushes, play the pushed piece first.
173 // for pulls: play the piece doing the action first
174 // NOTE: to push a piece out of the board, make it slide until its king
175 getPotentialMovesFrom([x, y]) {
176 const color = this.turn;
177 const sqCol = this.getColor(x, y);
178 const pawnShift = (color == 'w' ? -1 : 1);
179 const pawnStartRank = (color == 'w' ? 6 : 1);
180 const getMoveHash = (m) => {
181 return V.CoordsToSquare(m.start) + V.CoordsToSquare(m.end);
182 };
183 if (this.subTurn == 1) {
184 const addMoves = (dir, nbSteps) => {
185 const newMoves =
186 this.getMovesInDirection([x, y], [-dir[0], -dir[1]], nbSteps)
187 .filter(m => !movesHash[getMoveHash(m)]);
188 newMoves.forEach(m => { movesHash[getMoveHash(m)] = true; });
189 Array.prototype.push.apply(moves, newMoves);
190 };
191 // Free to play any move (if piece of my color):
192 let moves =
193 sqCol == color
194 ? super.getPotentialMovesFrom([x, y])
195 : [];
196 // There may be several suicide moves: keep only one
197 let hasExit = false;
198 moves = moves.filter(m => {
199 const suicide = (m.appear.length == 0);
200 if (suicide) {
201 if (hasExit) return false;
202 hasExit = true;
203 }
204 return true;
205 });
206 // Structure to avoid adding moves twice (can be action & move)
207 let movesHash = {};
208 moves.forEach(m => { movesHash[getMoveHash(m)] = true; });
209 // [x, y] is pushed by 'color'
210 for (let step of V.steps[V.KNIGHT]) {
211 const [i, j] = [x + step[0], y + step[1]];
212 if (
213 V.OnBoard(i, j) &&
214 this.board[i][j] != V.EMPTY &&
215 this.getColor(i, j) == color &&
216 this.getPiece(i, j) == V.KNIGHT
217 ) {
218 addMoves(step, 1);
219 }
220 }
221 for (let step of V.steps[V.ROOK].concat(V.steps[V.BISHOP])) {
222 let [i, j] = [x + step[0], y + step[1]];
223 while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
224 i += step[0];
225 j += step[1];
226 }
227 if (
228 V.OnBoard(i, j) &&
229 this.board[i][j] != V.EMPTY &&
230 this.getColor(i, j) == color
231 ) {
232 const deltaX = Math.abs(i - x);
233 const deltaY = Math.abs(j - y);
234 switch (this.getPiece(i, j)) {
235 case V.PAWN:
236 if (
237 (x - i) / deltaX == pawnShift &&
238 deltaX <= 2 &&
239 deltaY <= 1
240 ) {
241 if (sqCol == color && deltaY == 0) {
242 // Pushed forward
243 const maxSteps = (i == pawnStartRank && deltaX == 1 ? 2 : 1);
244 addMoves(step, maxSteps);
245 }
246 else if (sqCol != color && deltaY == 1 && deltaX == 1)
247 // Pushed diagonally
248 addMoves(step, 1);
249 }
250 break;
251 case V.ROOK:
252 if (deltaX == 0 || deltaY == 0) addMoves(step);
253 break;
254 case V.BISHOP:
255 if (deltaX == deltaY) addMoves(step);
256 break;
257 case V.QUEEN:
258 // All steps are valid for a queen:
259 addMoves(step);
260 break;
261 case V.KING:
262 if (deltaX <= 1 && deltaY <= 1) addMoves(step, 1);
263 break;
264 }
265 }
266 }
267 return moves;
268 }
269 // If subTurn == 2 then we should have a first move,
270 // which restrict what we can play now: only in the first move direction
271 const L = this.firstMove.length;
272 const fm = this.firstMove[L-1];
273 if (
274 (fm.appear.length == 2 && fm.vanish.length == 2) ||
275 (fm.vanish[0].c == sqCol && sqCol != color)
276 ) {
277 // Castle or again opponent color: no move playable then.
278 return [];
279 }
280 const piece = this.getPiece(x, y);
281 const getPushExit = () => {
282 // Piece at subTurn 1 exited: can I have caused the exit?
283 if (
284 this.isAprioriValidExit(
285 [x, y],
286 [fm.start.x, fm.start.y],
287 fm.vanish[0].c
288 )
289 ) {
290 // Seems so:
291 const dir = this.getNormalizedDirection(
292 [fm.start.x - x, fm.start.y - y]);
293 const nbSteps =
294 [V.PAWN, V.KING, V.KNIGHT].includes(piece)
295 ? 1
296 : null;
297 return this.getMovesInDirection([x, y], dir, nbSteps);
298 }
299 return [];
300 }
301 const getPushMoves = () => {
302 // Piece from subTurn 1 is still on board:
303 const dirM = this.getNormalizedDirection(
304 [fm.end.x - fm.start.x, fm.end.y - fm.start.y]);
305 const dir = this.getNormalizedDirection(
306 [fm.start.x - x, fm.start.y - y]);
307 // Normalized directions should match
308 if (dir[0] == dirM[0] && dir[1] == dirM[1]) {
309 // We don't know if first move is a pushed piece or normal move,
310 // so still must check if the push is valid.
311 const deltaX = Math.abs(fm.start.x - x);
312 const deltaY = Math.abs(fm.start.y - y);
313 switch (piece) {
314 case V.PAWN:
315 if (x == pawnStartRank) {
316 if (
317 (fm.start.x - x) * pawnShift < 0 ||
318 deltaX >= 3 ||
319 deltaY >= 2 ||
320 (fm.vanish[0].c == color && deltaY > 0) ||
321 (fm.vanish[0].c != color && deltaY == 0) ||
322 Math.abs(fm.end.x - fm.start.x) > deltaX ||
323 fm.end.y - fm.start.y != fm.start.y - y
324 ) {
325 return [];
326 }
327 }
328 else {
329 if (
330 fm.start.x - x != pawnShift ||
331 deltaY >= 2 ||
332 (fm.vanish[0].c == color && deltaY == 1) ||
333 (fm.vanish[0].c != color && deltaY == 0) ||
334 fm.end.x - fm.start.x != pawnShift ||
335 fm.end.y - fm.start.y != fm.start.y - y
336 ) {
337 return [];
338 }
339 }
340 break;
341 case V.KNIGHT:
342 if (
343 (deltaX + deltaY != 3 || (deltaX == 0 && deltaY == 0)) ||
344 (fm.end.x - fm.start.x != fm.start.x - x) ||
345 (fm.end.y - fm.start.y != fm.start.y - y)
346 ) {
347 return [];
348 }
349 break;
350 case V.KING:
351 if (
352 (deltaX >= 2 || deltaY >= 2) ||
353 (fm.end.x - fm.start.x != fm.start.x - x) ||
354 (fm.end.y - fm.start.y != fm.start.y - y)
355 ) {
356 return [];
357 }
358 break;
359 case V.BISHOP:
360 if (deltaX != deltaY) return [];
361 break;
362 case V.ROOK:
363 if (deltaX != 0 && deltaY != 0) return [];
364 break;
365 case V.QUEEN:
366 if (deltaX != deltaY && deltaX != 0 && deltaY != 0) return [];
367 break;
368 }
369 // Nothing should stand between [x, y] and the square fm.start
370 let [i, j] = [x + dir[0], y + dir[1]];
371 while (
372 (i != fm.start.x || j != fm.start.y) &&
373 this.board[i][j] == V.EMPTY
374 ) {
375 i += dir[0];
376 j += dir[1];
377 }
378 if (i == fm.start.x && j == fm.start.y)
379 return this.getMovesInDirection([x, y], dir);
380 }
381 return [];
382 }
383 const getPullExit = () => {
384 // Piece at subTurn 1 exited: can I be pulled?
385 // Note: kings cannot suicide, so fm.vanish[0].p is not KING.
386 // Could be PAWN though, if a pawn was pushed out of board.
387 if (
388 fm.vanish[0].p != V.PAWN && //pawns cannot pull
389 this.isAprioriValidExit(
390 [x, y],
391 [fm.start.x, fm.start.y],
392 fm.vanish[0].c,
393 fm.vanish[0].p
394 )
395 ) {
396 // Seems so:
397 const dir = this.getNormalizedDirection(
398 [fm.start.x - x, fm.start.y - y]);
399 const nbSteps = (fm.vanish[0].p == V.KNIGHT ? 1 : null);
400 return this.getMovesInDirection([x, y], dir, nbSteps);
401 }
402 return [];
403 };
404 const getPullMoves = () => {
405 if (fm.vanish[0].p == V.PAWN)
406 // pawns cannot pull
407 return [];
408 const dirM = this.getNormalizedDirection(
409 [fm.end.x - fm.start.x, fm.end.y - fm.start.y]);
410 const dir = this.getNormalizedDirection(
411 [fm.start.x - x, fm.start.y - y]);
412 // Normalized directions should match
413 if (dir[0] == dirM[0] && dir[1] == dirM[1]) {
414 // Am I at the right distance?
415 const deltaX = Math.abs(x - fm.start.x);
416 const deltaY = Math.abs(y - fm.start.y);
417 if (
418 (fm.vanish[0].p == V.KING && (deltaX > 1 || deltaY > 1)) ||
419 (fm.vanish[0].p == V.KNIGHT &&
420 (deltaX + deltaY != 3 || deltaX == 0 || deltaY == 0))
421 ) {
422 return [];
423 }
424 // Nothing should stand between [x, y] and the square fm.start
425 let [i, j] = [x + dir[0], y + dir[1]];
426 while (
427 (i != fm.start.x || j != fm.start.y) &&
428 this.board[i][j] == V.EMPTY
429 ) {
430 i += dir[0];
431 j += dir[1];
432 }
433 if (i == fm.start.x && j == fm.start.y)
434 return this.getMovesInDirection([x, y], dir);
435 }
436 return [];
437 };
438 if (fm.vanish[0].c != color) {
439 // Only possible action is a push:
440 if (fm.appear.length == 0) return getPushExit();
441 return getPushMoves();
442 }
443 else if (sqCol != color) {
444 // Only possible action is a pull, considering moving piece abilities
445 if (fm.appear.length == 0) return getPullExit();
446 return getPullMoves();
447 }
448 else {
449 // My color + my color: both actions possible
450 // Structure to avoid adding moves twice (can be action & move)
451 let movesHash = {};
452 if (fm.appear.length == 0) {
453 const pushes = getPushExit();
454 pushes.forEach(m => { movesHash[getMoveHash(m)] = true; });
455 return (
456 pushes.concat(getPullExit().filter(m => !movesHash[getMoveHash(m)]))
457 );
458 }
459 const pushes = getPushMoves();
460 pushes.forEach(m => { movesHash[getMoveHash(m)] = true; });
461 return (
462 pushes.concat(getPullMoves().filter(m => !movesHash[getMoveHash(m)]))
463 );
464 }
465 return [];
466 }
467
468 getSlideNJumpMoves([x, y], steps, oneStep) {
469 let moves = [];
470 const c = this.getColor(x, y);
471 const piece = this.getPiece(x, y);
472 outerLoop: for (let step of steps) {
473 let i = x + step[0];
474 let j = y + step[1];
475 while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
476 moves.push(this.getBasicMove([x, y], [i, j]));
477 if (oneStep) continue outerLoop;
478 i += step[0];
479 j += step[1];
480 }
481 if (V.OnBoard(i, j)) {
482 if (this.canTake([x, y], [i, j]))
483 moves.push(this.getBasicMove([x, y], [i, j]));
484 }
485 else {
486 // Add potential board exit (suicide), except for the king
487 if (piece != V.KING) {
488 moves.push({
489 start: { x: x, y: y},
490 end: { x: this.kingPos[c][0], y: this.kingPos[c][1] },
491 appear: [],
492 vanish: [
493 new PiPo({
494 x: x,
495 y: y,
496 c: c,
497 p: piece
498 })
499 ]
500 });
501 }
502 }
503 }
504 return moves;
505 }
506
507 // Does m2 un-do m1 ? (to disallow undoing actions)
508 oppositeMoves(m1, m2) {
509 const isEqual = (av1, av2) => {
510 for (let av of av1) {
511 const avInAv2 = av2.find(elt => {
512 return (
513 elt.x == av.x &&
514 elt.y == av.y &&
515 elt.c == av.c &&
516 elt.p == av.p
517 );
518 });
519 if (!avInAv2) return false;
520 }
521 return true;
522 };
523 // All appear and vanish arrays must have the same length
524 const mL = m1.appear.length;
525 return (
526 m2.appear.length == mL &&
527 m1.vanish.length == mL &&
528 m2.vanish.length == mL &&
529 isEqual(m1.appear, m2.vanish) &&
530 isEqual(m1.vanish, m2.appear)
531 );
532 }
533
939e06bf 534 // TODO: just stack in this.lastAction instead
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535 getAmove(move1, move2) {
536 // Just merge (one is action one is move, one may be empty)
537 return {
538 appear: move1.appear.concat(move2.appear),
539 vanish: move1.vanish.concat(move2.vanish)
540 }
541 }
542
543 filterValid(moves) {
544 const color = this.turn;
545 const La = this.amoves.length;
546 if (this.subTurn == 1) {
547 return moves.filter(m => {
548 // A move is valid either if it doesn't result in a check,
549 // or if a second move is possible to counter the check
550 // (not undoing a potential move + action of the opponent)
551 this.play(m);
552 let res = this.underCheck(color);
553 if (this.subTurn == 2) {
554 let isOpposite = La > 0 && this.oppositeMoves(this.amoves[La-1], m);
555 if (res || isOpposite) {
556 const moves2 = this.getAllPotentialMoves();
557 for (let m2 of moves2) {
558 this.play(m2);
559 const res2 = this.underCheck(color);
560 const amove = this.getAmove(m, m2);
561 isOpposite =
562 La > 0 && this.oppositeMoves(this.amoves[La-1], amove);
563 this.undo(m2);
564 if (!res2 && !isOpposite) {
565 res = false;
566 break;
567 }
568 }
569 }
570 }
571 this.undo(m);
572 return !res;
573 });
574 }
575 if (La == 0) return super.filterValid(moves);
576 const Lf = this.firstMove.length;
577 return (
578 super.filterValid(
579 moves.filter(m => {
580 // Move shouldn't undo another:
581 const amove = this.getAmove(this.firstMove[Lf-1], m);
582 return !this.oppositeMoves(this.amoves[La-1], amove);
583 })
584 )
585 );
586 }
587
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588 getEmptyMove() {
589 return new Move({
590 start: { x: -1, y: -1 },
591 end: { x: -1, y: -1 },
592 appear: [],
593 vanish: []
594 });
595 }
596
597 doClick(square) {
598 // A click to promote a piece on subTurn 2 would trigger this.
599 // For now it would then return [NaN, NaN] because surrounding squares
600 // have no IDs in the promotion modal. TODO: improve this?
601 if (isNaN(square[0])) return null;
602 // If subTurn == 2 && square is empty && !underCheck && !isOpposite,
603 // then return an empty move, allowing to "pass" subTurn2
604 const La = this.amoves.length;
605 const Lf = this.firstMove.length;
606 if (
607 this.subTurn == 2 &&
608 this.board[square[0]][square[1]] == V.EMPTY &&
609 !this.underCheck(this.turn) &&
610 (La == 0 || !this.oppositeMoves(this.amoves[La-1], this.firstMove[Lf-1]))
611 ) {
612 return this.getEmptyMove();
613 }
614 return null;
615 }
616
617 play(move) {
618 if (this.subTurn == 1 && move.vanish.length == 0) {
619 // Patch to work with old format: (TODO: remove later)
620 move.ignore = true;
621 return;
622 }
623 const color = this.turn;
624 move.subTurn = this.subTurn; //for undo
625 const gotoNext = (mv) => {
626 const L = this.firstMove.length;
627 this.amoves.push(this.getAmove(this.firstMove[L-1], mv));
628 this.turn = V.GetOppCol(color);
629 this.subTurn = 1;
630 this.movesCount++;
631 };
632 move.flags = JSON.stringify(this.aggregateFlags());
633 V.PlayOnBoard(this.board, move);
634 if (this.subTurn == 2) gotoNext(move);
635 else {
636 this.subTurn = 2;
637 this.firstMove.push(move);
638 this.toNewKingPos(move);
639 if (
640 // Condition is true on empty arrays:
641 this.getAllPotentialMoves().every(m => {
642 V.PlayOnBoard(this.board, m);
643 this.toNewKingPos(m);
644 const res = this.underCheck(color);
645 V.UndoOnBoard(this.board, m);
646 this.toOldKingPos(m);
647 return res;
648 })
649 ) {
650 // No valid move at subTurn 2
651 gotoNext(this.getEmptyMove());
652 }
653 this.toOldKingPos(move);
654 }
655 this.postPlay(move);
656 }
657
658 toNewKingPos(move) {
659 for (let a of move.appear)
660 if (a.p == V.KING) this.kingPos[a.c] = [a.x, a.y];
661 }
662
663 postPlay(move) {
664 if (move.start.x < 0) return;
665 this.toNewKingPos(move);
666 this.updateCastleFlags(move);
667 }
668
669 updateCastleFlags(move) {
670 const firstRank = { 'w': V.size.x - 1, 'b': 0 };
671 for (let v of move.vanish) {
672 if (v.p == V.KING) this.castleFlags[v.c] = [V.size.y, V.size.y];
673 else if (v.x == firstRank[v.c] && this.castleFlags[v.c].includes(v.y)) {
674 const flagIdx = (v.y == this.castleFlags[v.c][0] ? 0 : 1);
675 this.castleFlags[v.c][flagIdx] = V.size.y;
676 }
677 }
678 }
679
680 undo(move) {
681 if (!!move.ignore) return; //TODO: remove that later
682 this.disaggregateFlags(JSON.parse(move.flags));
683 V.UndoOnBoard(this.board, move);
684 if (this.subTurn == 1) {
685 this.amoves.pop();
686 this.turn = V.GetOppCol(this.turn);
687 this.movesCount--;
688 }
689 if (move.subTurn == 1) this.firstMove.pop();
690 this.subTurn = move.subTurn;
691 this.toOldKingPos(move);
692 }
693
694 toOldKingPos(move) {
695 // (Potentially) Reset king position
696 for (let v of move.vanish)
697 if (v.p == V.KING) this.kingPos[v.c] = [v.x, v.y];
698 }
699
66ab134b 700};