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2a8a94c9 | 1 | import { ArrayFun } from "@/utils/array"; |
afbf3ca7 | 2 | import { randInt } from "@/utils/alea"; |
2a8a94c9 BA |
3 | import { ChessRules, PiPo, Move } from "@/base_rules"; |
4 | ||
32f6285e | 5 | export class EightpiecesRules extends ChessRules { |
2a8a94c9 BA |
6 | static get JAILER() { |
7 | return "j"; | |
8 | } | |
9 | static get SENTRY() { | |
10 | return "s"; | |
11 | } | |
12 | static get LANCER() { | |
13 | return "l"; | |
14 | } | |
15 | ||
14edde72 BA |
16 | static get IMAGE_EXTENSION() { |
17 | // Temporarily, for the time SVG pieces are being designed: | |
18 | return ".png"; | |
19 | } | |
20 | ||
ee307044 | 21 | // Lancer directions *from white perspective* |
28b32b4f BA |
22 | static get LANCER_DIRS() { |
23 | return { | |
24 | 'c': [-1, 0], //north | |
25 | 'd': [-1, 1], //N-E | |
26 | 'e': [0, 1], //east | |
27 | 'f': [1, 1], //S-E | |
28 | 'g': [1, 0], //south | |
29 | 'h': [1, -1], //S-W | |
30 | 'm': [0, -1], //west | |
31 | 'o': [-1, -1] //N-W | |
32 | }; | |
33 | } | |
34 | ||
3a2a7b5f BA |
35 | static get PIECES() { |
36 | return ChessRules.PIECES | |
37 | .concat([V.JAILER, V.SENTRY]) | |
38 | .concat(Object.keys(V.LANCER_DIRS)); | |
39 | } | |
40 | ||
28b32b4f BA |
41 | getPiece(i, j) { |
42 | const piece = this.board[i][j].charAt(1); | |
43 | // Special lancer case: 8 possible orientations | |
44 | if (Object.keys(V.LANCER_DIRS).includes(piece)) return V.LANCER; | |
45 | return piece; | |
46 | } | |
47 | ||
3a2a7b5f | 48 | getPpath(b, color, score, orientation) { |
14edde72 | 49 | if ([V.JAILER, V.SENTRY].includes(b[1])) return "Eightpieces/tmp_png/" + b; |
3a2a7b5f | 50 | if (Object.keys(V.LANCER_DIRS).includes(b[1])) { |
14edde72 | 51 | if (orientation == 'w') return "Eightpieces/tmp_png/" + b; |
3a2a7b5f BA |
52 | // Find opposite direction for adequate display: |
53 | let oppDir = ''; | |
54 | switch (b[1]) { | |
55 | case 'c': | |
56 | oppDir = 'g'; | |
57 | break; | |
58 | case 'g': | |
59 | oppDir = 'c'; | |
60 | break; | |
61 | case 'd': | |
62 | oppDir = 'h'; | |
63 | break; | |
64 | case 'h': | |
65 | oppDir = 'd'; | |
66 | break; | |
67 | case 'e': | |
68 | oppDir = 'm'; | |
69 | break; | |
70 | case 'm': | |
71 | oppDir = 'e'; | |
72 | break; | |
73 | case 'f': | |
74 | oppDir = 'o'; | |
75 | break; | |
76 | case 'o': | |
77 | oppDir = 'f'; | |
78 | break; | |
79 | } | |
14edde72 | 80 | return "Eightpieces/tmp_png/" + b[0] + oppDir; |
3a2a7b5f | 81 | } |
14edde72 BA |
82 | // TODO: after we have SVG pieces, remove the folder and next prefix: |
83 | return "Eightpieces/tmp_png/" + b; | |
90e814b6 BA |
84 | } |
85 | ||
c7550017 BA |
86 | getPPpath(m, orientation) { |
87 | return ( | |
88 | this.getPpath( | |
89 | m.appear[0].c + m.appear[0].p, | |
90 | null, | |
91 | null, | |
92 | orientation | |
93 | ) | |
94 | ); | |
3a2a7b5f BA |
95 | } |
96 | ||
90e814b6 BA |
97 | static ParseFen(fen) { |
98 | const fenParts = fen.split(" "); | |
3a2a7b5f BA |
99 | return Object.assign( |
100 | ChessRules.ParseFen(fen), | |
101 | { sentrypush: fenParts[5] } | |
102 | ); | |
103 | } | |
104 | ||
105 | static IsGoodFen(fen) { | |
106 | if (!ChessRules.IsGoodFen(fen)) return false; | |
107 | const fenParsed = V.ParseFen(fen); | |
108 | // 5) Check sentry push (if any) | |
109 | if ( | |
110 | fenParsed.sentrypush != "-" && | |
61656127 | 111 | !fenParsed.sentrypush.match(/^([a-h][1-8]){2,2}$/) |
3a2a7b5f BA |
112 | ) { |
113 | return false; | |
114 | } | |
115 | return true; | |
90e814b6 BA |
116 | } |
117 | ||
118 | getFen() { | |
6b7b2cf7 | 119 | return super.getFen() + " " + this.getSentrypushFen(); |
90e814b6 BA |
120 | } |
121 | ||
122 | getFenForRepeat() { | |
6b7b2cf7 | 123 | return super.getFenForRepeat() + "_" + this.getSentrypushFen(); |
90e814b6 BA |
124 | } |
125 | ||
6b7b2cf7 BA |
126 | getSentrypushFen() { |
127 | const L = this.sentryPush.length; | |
128 | if (!this.sentryPush[L-1]) return "-"; | |
90e814b6 | 129 | let res = ""; |
0a9cef13 BA |
130 | const spL = this.sentryPush[L-1].length; |
131 | // Condensate path: just need initial and final squares: | |
132 | return [0, spL - 1] | |
133 | .map(i => V.CoordsToSquare(this.sentryPush[L-1][i])) | |
61656127 | 134 | .join(""); |
2a8a94c9 BA |
135 | } |
136 | ||
28b32b4f BA |
137 | setOtherVariables(fen) { |
138 | super.setOtherVariables(fen); | |
139 | // subTurn == 2 only when a sentry moved, and is about to push something | |
140 | this.subTurn = 1; | |
afbf3ca7 BA |
141 | // Sentry position just after a "capture" (subTurn from 1 to 2) |
142 | this.sentryPos = null; | |
28b32b4f | 143 | // Stack pieces' forbidden squares after a sentry move at each turn |
90e814b6 | 144 | const parsedFen = V.ParseFen(fen); |
6b7b2cf7 | 145 | if (parsedFen.sentrypush == "-") this.sentryPush = [null]; |
90e814b6 | 146 | else { |
0a9cef13 | 147 | // Expand init + dest squares into a full path: |
61656127 BA |
148 | const init = V.SquareToCoords(parsedFen.sentrypush.substr(0, 2)), |
149 | dest = V.SquareToCoords(parsedFen.sentrypush.substr(2)); | |
0a9cef13 BA |
150 | let newPath = [init]; |
151 | const delta = ['x', 'y'].map(i => Math.abs(dest[i] - init[i])); | |
152 | // Check that it's not a knight movement: | |
153 | if (delta[0] == 0 || delta[1] == 0 || delta[0] == delta[1]) { | |
154 | const step = ['x', 'y'].map((i, idx) => { | |
155 | return (dest[i] - init[i]) / delta[idx] || 0 | |
156 | }); | |
157 | let x = init.x + step[0], | |
158 | y = init.y + step[1]; | |
159 | while (x != dest.x || y != dest.y) { | |
160 | newPath.push({ x: x, y: y }); | |
161 | x += step[0]; | |
162 | y += step[1]; | |
163 | } | |
164 | } | |
165 | newPath.push(dest); | |
166 | this.sentryPush = [newPath]; | |
90e814b6 | 167 | } |
2a8a94c9 BA |
168 | } |
169 | ||
2a8a94c9 | 170 | static GenRandInitFen(randomness) { |
9842aca2 BA |
171 | if (randomness == 0) |
172 | // Deterministic: | |
d54f6261 | 173 | return "jfsqkbnr/pppppppp/8/8/8/8/PPPPPPPP/JDSQKBNR w 0 ahah - -"; |
9842aca2 BA |
174 | |
175 | let pieces = { w: new Array(8), b: new Array(8) }; | |
3a2a7b5f | 176 | let flags = ""; |
9842aca2 BA |
177 | // Shuffle pieces on first (and last rank if randomness == 2) |
178 | for (let c of ["w", "b"]) { | |
179 | if (c == 'b' && randomness == 1) { | |
ee307044 BA |
180 | const lancerIdx = pieces['w'].findIndex(p => { |
181 | return Object.keys(V.LANCER_DIRS).includes(p); | |
182 | }); | |
183 | pieces['b'] = | |
184 | pieces['w'].slice(0, lancerIdx) | |
185 | .concat(['g']) | |
186 | .concat(pieces['w'].slice(lancerIdx + 1)); | |
3a2a7b5f | 187 | flags += flags; |
9842aca2 BA |
188 | break; |
189 | } | |
190 | ||
191 | let positions = ArrayFun.range(8); | |
192 | ||
193 | // Get random squares for bishop and sentry | |
194 | let randIndex = 2 * randInt(4); | |
195 | let bishopPos = positions[randIndex]; | |
196 | // The sentry must be on a square of different color | |
197 | let randIndex_tmp = 2 * randInt(4) + 1; | |
198 | let sentryPos = positions[randIndex_tmp]; | |
199 | if (c == 'b') { | |
200 | // Check if white sentry is on the same color as ours. | |
201 | // If yes: swap bishop and sentry positions. | |
7e476ce4 BA |
202 | // NOTE: test % 2 == 1 because there are 7 slashes. |
203 | if ((pieces['w'].indexOf('s') - sentryPos) % 2 == 1) | |
9842aca2 BA |
204 | [bishopPos, sentryPos] = [sentryPos, bishopPos]; |
205 | } | |
206 | positions.splice(Math.max(randIndex, randIndex_tmp), 1); | |
207 | positions.splice(Math.min(randIndex, randIndex_tmp), 1); | |
208 | ||
209 | // Get random squares for knight and lancer | |
210 | randIndex = randInt(6); | |
211 | const knightPos = positions[randIndex]; | |
212 | positions.splice(randIndex, 1); | |
213 | randIndex = randInt(5); | |
214 | const lancerPos = positions[randIndex]; | |
215 | positions.splice(randIndex, 1); | |
216 | ||
217 | // Get random square for queen | |
218 | randIndex = randInt(4); | |
219 | const queenPos = positions[randIndex]; | |
220 | positions.splice(randIndex, 1); | |
221 | ||
222 | // Rook, jailer and king positions are now almost fixed, | |
a6836242 | 223 | // only the ordering rook->jailer or jailer->rook must be decided. |
9842aca2 BA |
224 | let rookPos = positions[0]; |
225 | let jailerPos = positions[2]; | |
226 | const kingPos = positions[1]; | |
3a2a7b5f | 227 | flags += V.CoordToColumn(rookPos) + V.CoordToColumn(jailerPos); |
9842aca2 BA |
228 | if (Math.random() < 0.5) [rookPos, jailerPos] = [jailerPos, rookPos]; |
229 | ||
230 | pieces[c][rookPos] = "r"; | |
231 | pieces[c][knightPos] = "n"; | |
232 | pieces[c][bishopPos] = "b"; | |
233 | pieces[c][queenPos] = "q"; | |
234 | pieces[c][kingPos] = "k"; | |
235 | pieces[c][sentryPos] = "s"; | |
236 | // Lancer faces north for white, and south for black: | |
237 | pieces[c][lancerPos] = c == 'w' ? 'c' : 'g'; | |
238 | pieces[c][jailerPos] = "j"; | |
239 | } | |
240 | return ( | |
241 | pieces["b"].join("") + | |
242 | "/pppppppp/8/8/8/8/PPPPPPPP/" + | |
243 | pieces["w"].join("").toUpperCase() + | |
3a2a7b5f | 244 | " w 0 " + flags + " - -" |
9842aca2 | 245 | ); |
2a8a94c9 BA |
246 | } |
247 | ||
b0a0468a BA |
248 | canTake([x1, y1], [x2, y2]) { |
249 | if (this.subTurn == 2) | |
250 | // Only self captures on this subturn: | |
251 | return this.getColor(x1, y1) == this.getColor(x2, y2); | |
252 | return super.canTake([x1, y1], [x2, y2]); | |
253 | } | |
254 | ||
6b7b2cf7 BA |
255 | // Is piece on square (x,y) immobilized? |
256 | isImmobilized([x, y]) { | |
257 | const color = this.getColor(x, y); | |
258 | const oppCol = V.GetOppCol(color); | |
259 | for (let step of V.steps[V.ROOK]) { | |
260 | const [i, j] = [x + step[0], y + step[1]]; | |
261 | if ( | |
262 | V.OnBoard(i, j) && | |
263 | this.board[i][j] != V.EMPTY && | |
264 | this.getColor(i, j) == oppCol | |
265 | ) { | |
bfed878d | 266 | if (this.getPiece(i, j) == V.JAILER) return [i, j]; |
6b7b2cf7 BA |
267 | } |
268 | } | |
269 | return null; | |
270 | } | |
271 | ||
ee307044 BA |
272 | // Because of the lancers, getPiece() could be wrong: |
273 | // use board[x][y][1] instead (always valid). | |
274 | getBasicMove([sx, sy], [ex, ey], tr) { | |
1c58eb76 BA |
275 | const initColor = this.getColor(sx, sy); |
276 | const initPiece = this.board[sx][sy].charAt(1); | |
ee307044 BA |
277 | let mv = new Move({ |
278 | appear: [ | |
279 | new PiPo({ | |
280 | x: ex, | |
281 | y: ey, | |
1c58eb76 BA |
282 | c: tr ? tr.c : initColor, |
283 | p: tr ? tr.p : initPiece | |
ee307044 BA |
284 | }) |
285 | ], | |
286 | vanish: [ | |
287 | new PiPo({ | |
288 | x: sx, | |
289 | y: sy, | |
1c58eb76 BA |
290 | c: initColor, |
291 | p: initPiece | |
ee307044 BA |
292 | }) |
293 | ] | |
294 | }); | |
295 | ||
296 | // The opponent piece disappears if we take it | |
297 | if (this.board[ex][ey] != V.EMPTY) { | |
298 | mv.vanish.push( | |
299 | new PiPo({ | |
300 | x: ex, | |
301 | y: ey, | |
302 | c: this.getColor(ex, ey), | |
afbf3ca7 | 303 | p: this.board[ex][ey].charAt(1) |
ee307044 BA |
304 | }) |
305 | ); | |
306 | } | |
307 | ||
308 | return mv; | |
309 | } | |
310 | ||
bfed878d BA |
311 | canIplay(side, [x, y]) { |
312 | return ( | |
2c5d7b20 BA |
313 | (this.subTurn == 1 && this.turn == side && this.getColor(x, y) == side) |
314 | || | |
bfed878d BA |
315 | (this.subTurn == 2 && x == this.sentryPos.x && y == this.sentryPos.y) |
316 | ); | |
317 | } | |
318 | ||
3a2a7b5f | 319 | getPotentialMovesFrom([x, y]) { |
d9a7a1e4 BA |
320 | const piece = this.getPiece(x, y); |
321 | const L = this.sentryPush.length; | |
1b56b736 | 322 | // At subTurn == 2, jailers aren't effective (Jeff K) |
3a2a7b5f BA |
323 | if (this.subTurn == 1) { |
324 | const jsq = this.isImmobilized([x, y]); | |
325 | if (!!jsq) { | |
326 | let moves = []; | |
327 | // Special pass move if king: | |
d9a7a1e4 | 328 | if (piece == V.KING) { |
3a2a7b5f BA |
329 | moves.push( |
330 | new Move({ | |
331 | appear: [], | |
332 | vanish: [], | |
333 | start: { x: x, y: y }, | |
334 | end: { x: jsq[0], y: jsq[1] } | |
335 | }) | |
336 | ); | |
337 | } | |
d9a7a1e4 BA |
338 | else if (piece == V.LANCER && !!this.sentryPush[L-1]) { |
339 | // A pushed lancer next to the jailer: reorient | |
340 | const color = this.getColor(x, y); | |
341 | const curDir = this.board[x][y].charAt(1); | |
342 | Object.keys(V.LANCER_DIRS).forEach(k => { | |
343 | moves.push( | |
344 | new Move({ | |
345 | appear: [{ x: x, y: y, c: color, p: k }], | |
346 | vanish: [{ x: x, y: y, c: color, p: curDir }], | |
347 | start: { x: x, y: y }, | |
348 | end: { x: jsq[0], y: jsq[1] } | |
349 | }) | |
350 | ); | |
351 | }); | |
352 | } | |
3a2a7b5f BA |
353 | return moves; |
354 | } | |
355 | } | |
bfed878d | 356 | let moves = []; |
d9a7a1e4 | 357 | switch (piece) { |
6b7b2cf7 | 358 | case V.JAILER: |
bfed878d BA |
359 | moves = this.getPotentialJailerMoves([x, y]); |
360 | break; | |
6b7b2cf7 | 361 | case V.SENTRY: |
bfed878d BA |
362 | moves = this.getPotentialSentryMoves([x, y]); |
363 | break; | |
13102cab | 364 | case V.LANCER: |
bfed878d BA |
365 | moves = this.getPotentialLancerMoves([x, y]); |
366 | break; | |
6b7b2cf7 | 367 | default: |
bfed878d BA |
368 | moves = super.getPotentialMovesFrom([x, y]); |
369 | break; | |
6b7b2cf7 | 370 | } |
bfed878d | 371 | if (!!this.sentryPush[L-1]) { |
d9a7a1e4 BA |
372 | // Delete moves walking back on sentry push path, |
373 | // only if not a pawn, and the piece is the pushed one. | |
374 | const pl = this.sentryPush[L-1].length; | |
375 | const finalPushedSq = this.sentryPush[L-1][pl-1]; | |
bfed878d BA |
376 | moves = moves.filter(m => { |
377 | if ( | |
378 | m.vanish[0].p != V.PAWN && | |
d9a7a1e4 | 379 | m.start.x == finalPushedSq.x && m.start.y == finalPushedSq.y && |
bfed878d BA |
380 | this.sentryPush[L-1].some(sq => sq.x == m.end.x && sq.y == m.end.y) |
381 | ) { | |
382 | return false; | |
383 | } | |
384 | return true; | |
385 | }); | |
b0a0468a BA |
386 | } else if (this.subTurn == 2) { |
387 | // Put back the sentinel on board: | |
388 | const color = this.turn; | |
bfed878d | 389 | moves.forEach(m => { |
b0a0468a | 390 | m.appear.push({x: x, y: y, p: V.SENTRY, c: color}); |
bfed878d BA |
391 | }); |
392 | } | |
393 | return moves; | |
6b7b2cf7 BA |
394 | } |
395 | ||
ee307044 | 396 | getPotentialPawnMoves([x, y]) { |
bfed878d | 397 | const color = this.getColor(x, y); |
ee307044 BA |
398 | let moves = []; |
399 | const [sizeX, sizeY] = [V.size.x, V.size.y]; | |
89781a55 | 400 | let shiftX = (color == "w" ? -1 : 1); |
b0a0468a | 401 | if (this.subTurn == 2) shiftX *= -1; |
89781a55 | 402 | const firstRank = color == "w" ? sizeX - 1 : 0; |
ee307044 BA |
403 | const startRank = color == "w" ? sizeX - 2 : 1; |
404 | const lastRank = color == "w" ? 0 : sizeX - 1; | |
405 | ||
b0a0468a BA |
406 | // Pawns might be pushed on 1st rank and attempt to move again: |
407 | if (!V.OnBoard(x + shiftX, y)) return []; | |
408 | ||
7f1df0d9 BA |
409 | // A push cannot put a pawn on last rank (it goes backward) |
410 | let finalPieces = [V.PAWN]; | |
411 | if (x + shiftX == lastRank) { | |
412 | // Only allow direction facing inside board: | |
413 | const allowedLancerDirs = | |
414 | lastRank == 0 | |
415 | ? ['e', 'f', 'g', 'h', 'm'] | |
416 | : ['c', 'd', 'e', 'm', 'o']; | |
417 | finalPieces = | |
418 | allowedLancerDirs | |
419 | .concat([V.ROOK, V.KNIGHT, V.BISHOP, V.QUEEN, V.SENTRY, V.JAILER]); | |
420 | } | |
ee307044 BA |
421 | if (this.board[x + shiftX][y] == V.EMPTY) { |
422 | // One square forward | |
423 | for (let piece of finalPieces) { | |
424 | moves.push( | |
425 | this.getBasicMove([x, y], [x + shiftX, y], { | |
426 | c: color, | |
427 | p: piece | |
428 | }) | |
429 | ); | |
430 | } | |
431 | if ( | |
89781a55 BA |
432 | // 2-squares jumps forbidden if pawn push |
433 | this.subTurn == 1 && | |
434 | [startRank, firstRank].includes(x) && | |
ee307044 BA |
435 | this.board[x + 2 * shiftX][y] == V.EMPTY |
436 | ) { | |
437 | // Two squares jump | |
438 | moves.push(this.getBasicMove([x, y], [x + 2 * shiftX, y])); | |
439 | } | |
440 | } | |
441 | // Captures | |
442 | for (let shiftY of [-1, 1]) { | |
443 | if ( | |
444 | y + shiftY >= 0 && | |
445 | y + shiftY < sizeY && | |
446 | this.board[x + shiftX][y + shiftY] != V.EMPTY && | |
447 | this.canTake([x, y], [x + shiftX, y + shiftY]) | |
448 | ) { | |
449 | for (let piece of finalPieces) { | |
450 | moves.push( | |
451 | this.getBasicMove([x, y], [x + shiftX, y + shiftY], { | |
452 | c: color, | |
453 | p: piece | |
454 | }) | |
455 | ); | |
6b7b2cf7 | 456 | } |
ee307044 BA |
457 | } |
458 | } | |
459 | ||
89781a55 | 460 | // En passant: only on subTurn == 1 |
ee307044 | 461 | const Lep = this.epSquares.length; |
3a2a7b5f | 462 | const epSquare = this.epSquares[Lep - 1]; |
ee307044 | 463 | if ( |
89781a55 | 464 | this.subTurn == 1 && |
ee307044 BA |
465 | !!epSquare && |
466 | epSquare.x == x + shiftX && | |
467 | Math.abs(epSquare.y - y) == 1 | |
468 | ) { | |
469 | let enpassantMove = this.getBasicMove([x, y], [epSquare.x, epSquare.y]); | |
470 | enpassantMove.vanish.push({ | |
471 | x: x, | |
472 | y: epSquare.y, | |
473 | p: "p", | |
474 | c: this.getColor(x, epSquare.y) | |
6b7b2cf7 | 475 | }); |
ee307044 | 476 | moves.push(enpassantMove); |
6b7b2cf7 | 477 | } |
6b7b2cf7 | 478 | |
ee307044 | 479 | return moves; |
9842aca2 BA |
480 | } |
481 | ||
1b56b736 BA |
482 | doClick(square) { |
483 | if (isNaN(square[0])) return null; | |
484 | const L = this.sentryPush.length; | |
485 | const [x, y] = [square[0], square[1]]; | |
486 | const color = this.turn; | |
487 | if ( | |
488 | this.subTurn == 2 || | |
489 | this.board[x][y] == V.EMPTY || | |
490 | this.getPiece(x, y) != V.LANCER || | |
491 | this.getColor(x, y) != color || | |
492 | !!this.sentryPush[L-1] | |
493 | ) { | |
494 | return null; | |
495 | } | |
496 | // Stuck lancer? | |
497 | const orientation = this.board[x][y][1]; | |
498 | const step = V.LANCER_DIRS[orientation]; | |
499 | if (!V.OnBoard(x + step[0], y + step[1])) { | |
500 | let choices = []; | |
501 | Object.keys(V.LANCER_DIRS).forEach(k => { | |
502 | const dir = V.LANCER_DIRS[k]; | |
503 | if ( | |
504 | (dir[0] != step[0] || dir[1] != step[1]) && | |
505 | V.OnBoard(x + dir[0], y + dir[1]) | |
506 | ) { | |
507 | choices.push( | |
508 | new Move({ | |
509 | vanish: [ | |
510 | new PiPo({ | |
511 | x: x, | |
512 | y: y, | |
513 | c: color, | |
514 | p: orientation | |
515 | }) | |
516 | ], | |
517 | appear: [ | |
518 | new PiPo({ | |
519 | x: x, | |
520 | y: y, | |
521 | c: color, | |
522 | p: k | |
523 | }) | |
524 | ], | |
525 | start: { x: x, y : y }, | |
526 | end: { x: -1, y: -1 } | |
527 | }) | |
528 | ); | |
529 | } | |
530 | }); | |
531 | return choices; | |
532 | } | |
533 | return null; | |
534 | } | |
535 | ||
3a2a7b5f | 536 | // Obtain all lancer moves in "step" direction |
afbf3ca7 | 537 | getPotentialLancerMoves_aux([x, y], step, tr) { |
9842aca2 BA |
538 | let moves = []; |
539 | // Add all moves to vacant squares until opponent is met: | |
b0a0468a BA |
540 | const color = this.getColor(x, y); |
541 | const oppCol = | |
542 | this.subTurn == 1 | |
543 | ? V.GetOppCol(color) | |
544 | // at subTurn == 2, consider own pieces as opponent | |
545 | : color; | |
9842aca2 BA |
546 | let sq = [x + step[0], y + step[1]]; |
547 | while (V.OnBoard(sq[0], sq[1]) && this.getColor(sq[0], sq[1]) != oppCol) { | |
548 | if (this.board[sq[0]][sq[1]] == V.EMPTY) | |
afbf3ca7 | 549 | moves.push(this.getBasicMove([x, y], sq, tr)); |
9842aca2 BA |
550 | sq[0] += step[0]; |
551 | sq[1] += step[1]; | |
552 | } | |
553 | if (V.OnBoard(sq[0], sq[1])) | |
554 | // Add capturing move | |
afbf3ca7 | 555 | moves.push(this.getBasicMove([x, y], sq, tr)); |
9842aca2 | 556 | return moves; |
6b7b2cf7 BA |
557 | } |
558 | ||
559 | getPotentialLancerMoves([x, y]) { | |
9842aca2 BA |
560 | let moves = []; |
561 | // Add all lancer possible orientations, similar to pawn promotions. | |
562 | // Except if just after a push: allow all movements from init square then | |
ee307044 | 563 | const L = this.sentryPush.length; |
89781a55 | 564 | const color = this.getColor(x, y); |
1b56b736 | 565 | const dirCode = this.board[x][y][1]; |
737a5daf | 566 | const curDir = V.LANCER_DIRS[dirCode]; |
ee307044 | 567 | if (!!this.sentryPush[L-1]) { |
9842aca2 | 568 | // Maybe I was pushed |
ee307044 | 569 | const pl = this.sentryPush[L-1].length; |
9842aca2 | 570 | if ( |
ee307044 BA |
571 | this.sentryPush[L-1][pl-1].x == x && |
572 | this.sentryPush[L-1][pl-1].y == y | |
9842aca2 BA |
573 | ) { |
574 | // I was pushed: allow all directions (for this move only), but | |
3a2a7b5f BA |
575 | // do not change direction after moving, *except* if I keep the |
576 | // same orientation in which I was pushed. | |
1b56b736 BA |
577 | // Also allow simple reorientation ("capturing king"): |
578 | if (!V.OnBoard(x + curDir[0], y + curDir[1])) { | |
579 | const kp = this.kingPos[color]; | |
580 | let reorientMoves = []; | |
581 | Object.keys(V.LANCER_DIRS).forEach(k => { | |
582 | const dir = V.LANCER_DIRS[k]; | |
583 | if ( | |
584 | (dir[0] != curDir[0] || dir[1] != curDir[1]) && | |
585 | V.OnBoard(x + dir[0], y + dir[1]) | |
586 | ) { | |
587 | reorientMoves.push( | |
588 | new Move({ | |
589 | vanish: [ | |
590 | new PiPo({ | |
591 | x: x, | |
592 | y: y, | |
593 | c: color, | |
594 | p: dirCode | |
595 | }) | |
596 | ], | |
597 | appear: [ | |
598 | new PiPo({ | |
599 | x: x, | |
600 | y: y, | |
601 | c: color, | |
602 | p: k | |
603 | }) | |
604 | ], | |
605 | start: { x: x, y : y }, | |
606 | end: { x: kp[0], y: kp[1] } | |
607 | }) | |
608 | ); | |
609 | } | |
610 | }); | |
611 | Array.prototype.push.apply(moves, reorientMoves); | |
612 | } | |
9842aca2 | 613 | Object.values(V.LANCER_DIRS).forEach(step => { |
afbf3ca7 | 614 | const dirCode = Object.keys(V.LANCER_DIRS).find(k => { |
3a2a7b5f BA |
615 | return ( |
616 | V.LANCER_DIRS[k][0] == step[0] && | |
617 | V.LANCER_DIRS[k][1] == step[1] | |
618 | ); | |
afbf3ca7 | 619 | }); |
3a2a7b5f BA |
620 | const dirMoves = |
621 | this.getPotentialLancerMoves_aux( | |
622 | [x, y], | |
623 | step, | |
624 | { p: dirCode, c: color } | |
625 | ); | |
626 | if (curDir[0] == step[0] && curDir[1] == step[1]) { | |
627 | // Keeping same orientation: can choose after | |
628 | let chooseMoves = []; | |
629 | dirMoves.forEach(m => { | |
630 | Object.keys(V.LANCER_DIRS).forEach(k => { | |
33974019 BA |
631 | const newDir = V.LANCER_DIRS[k]; |
632 | // Prevent orientations toward outer board: | |
633 | if (V.OnBoard(m.end.x + newDir[0], m.end.y + newDir[1])) { | |
634 | let mk = JSON.parse(JSON.stringify(m)); | |
635 | mk.appear[0].p = k; | |
636 | chooseMoves.push(mk); | |
637 | } | |
3a2a7b5f BA |
638 | }); |
639 | }); | |
640 | Array.prototype.push.apply(moves, chooseMoves); | |
33974019 BA |
641 | } |
642 | else Array.prototype.push.apply(moves, dirMoves); | |
9842aca2 BA |
643 | }); |
644 | return moves; | |
645 | } | |
646 | } | |
647 | // I wasn't pushed: standard lancer move | |
9842aca2 BA |
648 | const monodirMoves = |
649 | this.getPotentialLancerMoves_aux([x, y], V.LANCER_DIRS[dirCode]); | |
bfed878d BA |
650 | // Add all possible orientations aftermove except if I'm being pushed |
651 | if (this.subTurn == 1) { | |
652 | monodirMoves.forEach(m => { | |
653 | Object.keys(V.LANCER_DIRS).forEach(k => { | |
33974019 BA |
654 | const newDir = V.LANCER_DIRS[k]; |
655 | // Prevent orientations toward outer board: | |
656 | if (V.OnBoard(m.end.x + newDir[0], m.end.y + newDir[1])) { | |
657 | let mk = JSON.parse(JSON.stringify(m)); | |
658 | mk.appear[0].p = k; | |
659 | moves.push(mk); | |
660 | } | |
bfed878d | 661 | }); |
9842aca2 | 662 | }); |
bfed878d | 663 | return moves; |
33974019 BA |
664 | } |
665 | else { | |
737a5daf | 666 | // I'm pushed: add potential nudges, except for current orientation |
3a2a7b5f BA |
667 | let potentialNudges = []; |
668 | for (let step of V.steps[V.ROOK].concat(V.steps[V.BISHOP])) { | |
669 | if ( | |
737a5daf | 670 | (step[0] != curDir[0] || step[1] != curDir[1]) && |
3a2a7b5f BA |
671 | V.OnBoard(x + step[0], y + step[1]) && |
672 | this.board[x + step[0]][y + step[1]] == V.EMPTY | |
673 | ) { | |
89781a55 BA |
674 | const newDirCode = Object.keys(V.LANCER_DIRS).find(k => { |
675 | const codeStep = V.LANCER_DIRS[k]; | |
676 | return (codeStep[0] == step[0] && codeStep[1] == step[1]); | |
677 | }); | |
3a2a7b5f BA |
678 | potentialNudges.push( |
679 | this.getBasicMove( | |
680 | [x, y], | |
89781a55 BA |
681 | [x + step[0], y + step[1]], |
682 | { c: color, p: newDirCode } | |
3a2a7b5f BA |
683 | ) |
684 | ); | |
685 | } | |
686 | } | |
687 | return monodirMoves.concat(potentialNudges); | |
688 | } | |
6b7b2cf7 BA |
689 | } |
690 | ||
691 | getPotentialSentryMoves([x, y]) { | |
692 | // The sentry moves a priori like a bishop: | |
693 | let moves = super.getPotentialBishopMoves([x, y]); | |
ee307044 BA |
694 | // ...but captures are replaced by special move, if and only if |
695 | // "captured" piece can move now, considered as the capturer unit. | |
afbf3ca7 BA |
696 | // --> except is subTurn == 2, in this case I don't push anything. |
697 | if (this.subTurn == 2) return moves.filter(m => m.vanish.length == 1); | |
9842aca2 BA |
698 | moves.forEach(m => { |
699 | if (m.vanish.length == 2) { | |
700 | // Temporarily cancel the sentry capture: | |
701 | m.appear.pop(); | |
702 | m.vanish.pop(); | |
703 | } | |
704 | }); | |
bfed878d | 705 | const color = this.getColor(x, y); |
ee307044 | 706 | const fMoves = moves.filter(m => { |
b0a0468a | 707 | // Can the pushed unit make any move? ...resulting in a non-self-check? |
bfed878d BA |
708 | if (m.appear.length == 0) { |
709 | let res = false; | |
710 | this.play(m); | |
b0a0468a | 711 | let moves2 = this.getPotentialMovesFrom([m.end.x, m.end.y]); |
bfed878d BA |
712 | for (let m2 of moves2) { |
713 | this.play(m2); | |
714 | res = !this.underCheck(color); | |
715 | this.undo(m2); | |
716 | if (res) break; | |
717 | } | |
718 | this.undo(m); | |
719 | return res; | |
720 | } | |
721 | return true; | |
ee307044 | 722 | }); |
ee307044 | 723 | return fMoves; |
6b7b2cf7 BA |
724 | } |
725 | ||
726 | getPotentialJailerMoves([x, y]) { | |
ee307044 BA |
727 | return super.getPotentialRookMoves([x, y]).filter(m => { |
728 | // Remove jailer captures | |
729 | return m.vanish[0].p != V.JAILER || m.vanish.length == 1; | |
730 | }); | |
6b7b2cf7 BA |
731 | } |
732 | ||
b0a0468a BA |
733 | getPotentialKingMoves(sq) { |
734 | const moves = this.getSlideNJumpMoves( | |
735 | sq, | |
736 | V.steps[V.ROOK].concat(V.steps[V.BISHOP]), | |
737 | "oneStep" | |
738 | ); | |
739 | return ( | |
740 | this.subTurn == 1 | |
741 | ? moves.concat(this.getCastleMoves(sq)) | |
742 | : moves | |
743 | ); | |
744 | } | |
745 | ||
3a2a7b5f BA |
746 | atLeastOneMove() { |
747 | // If in second-half of a move, we already know that a move is possible | |
748 | if (this.subTurn == 2) return true; | |
749 | return super.atLeastOneMove(); | |
750 | } | |
751 | ||
ee307044 | 752 | filterValid(moves) { |
b0a0468a BA |
753 | if (moves.length == 0) return []; |
754 | const basicFilter = (m, c) => { | |
755 | this.play(m); | |
756 | const res = !this.underCheck(c); | |
757 | this.undo(m); | |
758 | return res; | |
759 | }; | |
bfed878d BA |
760 | // Disable check tests for sentry pushes, |
761 | // because in this case the move isn't finished | |
762 | let movesWithoutSentryPushes = []; | |
763 | let movesWithSentryPushes = []; | |
764 | moves.forEach(m => { | |
b0a0468a BA |
765 | // Second condition below for special king "pass" moves |
766 | if (m.appear.length > 0 || m.vanish.length == 0) | |
767 | movesWithoutSentryPushes.push(m); | |
bfed878d BA |
768 | else movesWithSentryPushes.push(m); |
769 | }); | |
b0a0468a BA |
770 | const color = this.turn; |
771 | const oppCol = V.GetOppCol(color); | |
772 | const filteredMoves = | |
773 | movesWithoutSentryPushes.filter(m => basicFilter(m, color)); | |
774 | // If at least one full move made, everything is allowed. | |
775 | // Else: forbid checks and captures. | |
776 | return ( | |
777 | this.movesCount >= 2 | |
778 | ? filteredMoves | |
779 | : filteredMoves.filter(m => { | |
d958cc68 | 780 | return (m.vanish.length <= 1 && basicFilter(m, oppCol)); |
b0a0468a BA |
781 | }) |
782 | ).concat(movesWithSentryPushes); | |
bfed878d BA |
783 | } |
784 | ||
785 | getAllValidMoves() { | |
786 | if (this.subTurn == 1) return super.getAllValidMoves(); | |
787 | // Sentry push: | |
afbf3ca7 | 788 | const sentrySq = [this.sentryPos.x, this.sentryPos.y]; |
bfed878d | 789 | return this.filterValid(this.getPotentialMovesFrom(sentrySq)); |
ee307044 BA |
790 | } |
791 | ||
68e19a44 | 792 | isAttacked(sq, color) { |
afbf3ca7 | 793 | return ( |
68e19a44 BA |
794 | super.isAttacked(sq, color) || |
795 | this.isAttackedByLancer(sq, color) || | |
796 | this.isAttackedBySentry(sq, color) | |
9dca2c93 | 797 | // The jailer doesn't capture. |
afbf3ca7 BA |
798 | ); |
799 | } | |
800 | ||
68e19a44 | 801 | isAttackedBySlideNJump([x, y], color, piece, steps, oneStep) { |
b0a0468a BA |
802 | for (let step of steps) { |
803 | let rx = x + step[0], | |
804 | ry = y + step[1]; | |
805 | while (V.OnBoard(rx, ry) && this.board[rx][ry] == V.EMPTY && !oneStep) { | |
806 | rx += step[0]; | |
807 | ry += step[1]; | |
808 | } | |
809 | if ( | |
810 | V.OnBoard(rx, ry) && | |
68e19a44 BA |
811 | this.getPiece(rx, ry) == piece && |
812 | this.getColor(rx, ry) == color && | |
b0a0468a BA |
813 | !this.isImmobilized([rx, ry]) |
814 | ) { | |
815 | return true; | |
816 | } | |
817 | } | |
818 | return false; | |
819 | } | |
820 | ||
68e19a44 BA |
821 | isAttackedByPawn([x, y], color) { |
822 | const pawnShift = (color == "w" ? 1 : -1); | |
823 | if (x + pawnShift >= 0 && x + pawnShift < V.size.x) { | |
824 | for (let i of [-1, 1]) { | |
825 | if ( | |
826 | y + i >= 0 && | |
827 | y + i < V.size.y && | |
828 | this.getPiece(x + pawnShift, y + i) == V.PAWN && | |
829 | this.getColor(x + pawnShift, y + i) == color && | |
830 | !this.isImmobilized([x + pawnShift, y + i]) | |
831 | ) { | |
832 | return true; | |
b0a0468a BA |
833 | } |
834 | } | |
835 | } | |
836 | return false; | |
837 | } | |
838 | ||
68e19a44 | 839 | isAttackedByLancer([x, y], color) { |
afbf3ca7 BA |
840 | for (let step of V.steps[V.ROOK].concat(V.steps[V.BISHOP])) { |
841 | // If in this direction there are only enemy pieces and empty squares, | |
842 | // and we meet a lancer: can he reach us? | |
843 | // NOTE: do not stop at first lancer, there might be several! | |
844 | let coord = { x: x + step[0], y: y + step[1] }; | |
845 | let lancerPos = []; | |
846 | while ( | |
847 | V.OnBoard(coord.x, coord.y) && | |
848 | ( | |
849 | this.board[coord.x][coord.y] == V.EMPTY || | |
68e19a44 | 850 | this.getColor(coord.x, coord.y) == color |
afbf3ca7 BA |
851 | ) |
852 | ) { | |
b0a0468a BA |
853 | if ( |
854 | this.getPiece(coord.x, coord.y) == V.LANCER && | |
855 | !this.isImmobilized([coord.x, coord.y]) | |
856 | ) { | |
3a2a7b5f | 857 | lancerPos.push({x: coord.x, y: coord.y}); |
b0a0468a | 858 | } |
3a2a7b5f BA |
859 | coord.x += step[0]; |
860 | coord.y += step[1]; | |
afbf3ca7 | 861 | } |
737a5daf BA |
862 | const L = this.sentryPush.length; |
863 | const pl = (!!this.sentryPush[L-1] ? this.sentryPush[L-1].length : 0); | |
afbf3ca7 BA |
864 | for (let xy of lancerPos) { |
865 | const dir = V.LANCER_DIRS[this.board[xy.x][xy.y].charAt(1)]; | |
737a5daf BA |
866 | if ( |
867 | (dir[0] == -step[0] && dir[1] == -step[1]) || | |
868 | // If the lancer was just pushed, this is an attack too: | |
869 | ( | |
870 | !!this.sentryPush[L-1] && | |
871 | this.sentryPush[L-1][pl-1].x == xy.x && | |
872 | this.sentryPush[L-1][pl-1].y == xy.y | |
873 | ) | |
874 | ) { | |
875 | return true; | |
876 | } | |
afbf3ca7 BA |
877 | } |
878 | } | |
879 | return false; | |
880 | } | |
881 | ||
882 | // Helper to check sentries attacks: | |
883 | selfAttack([x1, y1], [x2, y2]) { | |
884 | const color = this.getColor(x1, y1); | |
9dca2c93 | 885 | const oppCol = V.GetOppCol(color); |
afbf3ca7 | 886 | const sliderAttack = (allowedSteps, lancer) => { |
89781a55 BA |
887 | const deltaX = x2 - x1, |
888 | absDeltaX = Math.abs(deltaX); | |
889 | const deltaY = y2 - y1, | |
890 | absDeltaY = Math.abs(deltaY); | |
518a0dc9 | 891 | const step = [ deltaX / absDeltaX || 0, deltaY / absDeltaY || 0 ]; |
89781a55 BA |
892 | if ( |
893 | // Check that the step is a priori valid: | |
894 | (absDeltaX != absDeltaY && deltaX != 0 && deltaY != 0) || | |
895 | allowedSteps.every(st => st[0] != step[0] || st[1] != step[1]) | |
896 | ) { | |
afbf3ca7 | 897 | return false; |
89781a55 | 898 | } |
3a2a7b5f | 899 | let sq = [ x1 + step[0], y1 + step[1] ]; |
f14572c4 | 900 | while (sq[0] != x2 || sq[1] != y2) { |
afbf3ca7 | 901 | if ( |
3a2a7b5f | 902 | // NOTE: no need to check OnBoard in this special case |
afbf3ca7 | 903 | (!lancer && this.board[sq[0]][sq[1]] != V.EMPTY) || |
9dca2c93 | 904 | (!!lancer && this.getColor(sq[0], sq[1]) == oppCol) |
afbf3ca7 BA |
905 | ) { |
906 | return false; | |
907 | } | |
3a2a7b5f BA |
908 | sq[0] += step[0]; |
909 | sq[1] += step[1]; | |
afbf3ca7 BA |
910 | } |
911 | return true; | |
912 | }; | |
913 | switch (this.getPiece(x1, y1)) { | |
914 | case V.PAWN: { | |
915 | // Pushed pawns move as enemy pawns | |
916 | const shift = (color == 'w' ? 1 : -1); | |
917 | return (x1 + shift == x2 && Math.abs(y1 - y2) == 1); | |
918 | } | |
919 | case V.KNIGHT: { | |
920 | const deltaX = Math.abs(x1 - x2); | |
921 | const deltaY = Math.abs(y1 - y2); | |
922 | return ( | |
923 | deltaX + deltaY == 3 && | |
924 | [1, 2].includes(deltaX) && | |
925 | [1, 2].includes(deltaY) | |
926 | ); | |
927 | } | |
928 | case V.ROOK: | |
929 | return sliderAttack(V.steps[V.ROOK]); | |
930 | case V.BISHOP: | |
931 | return sliderAttack(V.steps[V.BISHOP]); | |
932 | case V.QUEEN: | |
933 | return sliderAttack(V.steps[V.ROOK].concat(V.steps[V.BISHOP])); | |
934 | case V.LANCER: { | |
2c5d7b20 BA |
935 | // Special case: as long as no enemy units stands in-between, |
936 | // it attacks (if it points toward the king). | |
afbf3ca7 BA |
937 | const allowedStep = V.LANCER_DIRS[this.board[x1][y1].charAt(1)]; |
938 | return sliderAttack([allowedStep], "lancer"); | |
939 | } | |
940 | // No sentries or jailer tests: they cannot self-capture | |
941 | } | |
942 | return false; | |
943 | } | |
944 | ||
68e19a44 | 945 | isAttackedBySentry([x, y], color) { |
afbf3ca7 BA |
946 | // Attacked by sentry means it can self-take our king. |
947 | // Just check diagonals of enemy sentry(ies), and if it reaches | |
948 | // one of our pieces: can I self-take? | |
68e19a44 | 949 | const myColor = V.GetOppCol(color); |
afbf3ca7 BA |
950 | let candidates = []; |
951 | for (let i=0; i<V.size.x; i++) { | |
952 | for (let j=0; j<V.size.y; j++) { | |
953 | if ( | |
954 | this.getPiece(i,j) == V.SENTRY && | |
68e19a44 | 955 | this.getColor(i,j) == color && |
b0a0468a | 956 | !this.isImmobilized([i, j]) |
afbf3ca7 BA |
957 | ) { |
958 | for (let step of V.steps[V.BISHOP]) { | |
959 | let sq = [ i + step[0], j + step[1] ]; | |
960 | while ( | |
961 | V.OnBoard(sq[0], sq[1]) && | |
962 | this.board[sq[0]][sq[1]] == V.EMPTY | |
963 | ) { | |
964 | sq[0] += step[0]; | |
965 | sq[1] += step[1]; | |
966 | } | |
967 | if ( | |
968 | V.OnBoard(sq[0], sq[1]) && | |
68e19a44 | 969 | this.getColor(sq[0], sq[1]) == myColor |
afbf3ca7 | 970 | ) { |
3a2a7b5f | 971 | candidates.push([ sq[0], sq[1] ]); |
afbf3ca7 BA |
972 | } |
973 | } | |
974 | } | |
975 | } | |
976 | } | |
977 | for (let c of candidates) | |
978 | if (this.selfAttack(c, [x, y])) return true; | |
979 | return false; | |
980 | } | |
981 | ||
982 | // Jailer doesn't capture or give check | |
983 | ||
d54f6261 BA |
984 | prePlay(move) { |
985 | if (move.appear.length == 0 && move.vanish.length == 1) | |
986 | // The sentry is about to push a piece: subTurn goes from 1 to 2 | |
987 | this.sentryPos = { x: move.end.x, y: move.end.y }; | |
988 | if (this.subTurn == 2 && move.vanish[0].p != V.PAWN) { | |
989 | // A piece is pushed: forbid array of squares between start and end | |
990 | // of move, included (except if it's a pawn) | |
991 | let squares = []; | |
992 | if ([V.KNIGHT,V.KING].includes(move.vanish[0].p)) | |
993 | // short-range pieces: just forbid initial square | |
994 | squares.push({ x: move.start.x, y: move.start.y }); | |
995 | else { | |
996 | const deltaX = move.end.x - move.start.x; | |
997 | const deltaY = move.end.y - move.start.y; | |
998 | const step = [ | |
999 | deltaX / Math.abs(deltaX) || 0, | |
1000 | deltaY / Math.abs(deltaY) || 0 | |
1001 | ]; | |
1002 | for ( | |
1003 | let sq = {x: move.start.x, y: move.start.y}; | |
1004 | sq.x != move.end.x || sq.y != move.end.y; | |
1005 | sq.x += step[0], sq.y += step[1] | |
1006 | ) { | |
1007 | squares.push({ x: sq.x, y: sq.y }); | |
1008 | } | |
1009 | } | |
1010 | // Add end square as well, to know if I was pushed (useful for lancers) | |
1011 | squares.push({ x: move.end.x, y: move.end.y }); | |
1012 | this.sentryPush.push(squares); | |
1013 | } else this.sentryPush.push(null); | |
1014 | } | |
1015 | ||
1016 | play(move) { | |
1017 | this.prePlay(move); | |
1018 | move.flags = JSON.stringify(this.aggregateFlags()); | |
1019 | this.epSquares.push(this.getEpSquare(move)); | |
1020 | V.PlayOnBoard(this.board, move); | |
1021 | // Is it a sentry push? (useful for undo) | |
1022 | move.sentryPush = (this.subTurn == 2); | |
1023 | if (this.subTurn == 1) this.movesCount++; | |
1024 | if (move.appear.length == 0 && move.vanish.length == 1) this.subTurn = 2; | |
1025 | else { | |
1026 | // Turn changes only if not a sentry "pre-push" | |
1027 | this.turn = V.GetOppCol(this.turn); | |
1028 | this.subTurn = 1; | |
1029 | } | |
1030 | this.postPlay(move); | |
1031 | } | |
1032 | ||
1033 | postPlay(move) { | |
1034 | if (move.vanish.length == 0 || this.subTurn == 2) | |
1035 | // Special pass move of the king, or sentry pre-push: nothing to update | |
1036 | return; | |
1037 | const c = move.vanish[0].c; | |
1038 | const piece = move.vanish[0].p; | |
1039 | const firstRank = c == "w" ? V.size.x - 1 : 0; | |
1040 | ||
1041 | if (piece == V.KING) { | |
1042 | this.kingPos[c][0] = move.appear[0].x; | |
1043 | this.kingPos[c][1] = move.appear[0].y; | |
1044 | this.castleFlags[c] = [V.size.y, V.size.y]; | |
1045 | return; | |
1046 | } | |
1047 | // Update castling flags if rooks are moved | |
1048 | const oppCol = V.GetOppCol(c); | |
1049 | const oppFirstRank = V.size.x - 1 - firstRank; | |
1050 | if ( | |
1051 | move.start.x == firstRank && //our rook moves? | |
1052 | this.castleFlags[c].includes(move.start.y) | |
1053 | ) { | |
1054 | const flagIdx = (move.start.y == this.castleFlags[c][0] ? 0 : 1); | |
1055 | this.castleFlags[c][flagIdx] = V.size.y; | |
1056 | } else if ( | |
1057 | move.end.x == oppFirstRank && //we took opponent rook? | |
1058 | this.castleFlags[oppCol].includes(move.end.y) | |
1059 | ) { | |
1060 | const flagIdx = (move.end.y == this.castleFlags[oppCol][0] ? 0 : 1); | |
1061 | this.castleFlags[oppCol][flagIdx] = V.size.y; | |
1062 | } | |
1063 | } | |
1064 | ||
1065 | undo(move) { | |
1066 | this.epSquares.pop(); | |
1067 | this.disaggregateFlags(JSON.parse(move.flags)); | |
1068 | V.UndoOnBoard(this.board, move); | |
1069 | // Decrement movesCount except if the move is a sentry push | |
1070 | if (!move.sentryPush) this.movesCount--; | |
1071 | if (this.subTurn == 2) this.subTurn = 1; | |
1072 | else { | |
1073 | this.turn = V.GetOppCol(this.turn); | |
1074 | if (move.sentryPush) this.subTurn = 2; | |
1075 | } | |
1076 | this.postUndo(move); | |
1077 | } | |
1078 | ||
1079 | postUndo(move) { | |
1080 | super.postUndo(move); | |
1081 | this.sentryPush.pop(); | |
1082 | } | |
1083 | ||
2a8a94c9 BA |
1084 | static get VALUES() { |
1085 | return Object.assign( | |
28b32b4f | 1086 | { l: 4.8, s: 2.8, j: 3.8 }, //Jeff K. estimations |
2a8a94c9 BA |
1087 | ChessRules.VALUES |
1088 | ); | |
1089 | } | |
6b7b2cf7 | 1090 | |
afbf3ca7 BA |
1091 | getComputerMove() { |
1092 | const maxeval = V.INFINITY; | |
1093 | const color = this.turn; | |
1094 | let moves1 = this.getAllValidMoves(); | |
1095 | ||
1096 | if (moves1.length == 0) | |
1097 | // TODO: this situation should not happen | |
1098 | return null; | |
1099 | ||
3a2a7b5f | 1100 | const setEval = (move, next) => { |
afbf3ca7 | 1101 | const score = this.getCurrentScore(); |
3a2a7b5f | 1102 | const curEval = move.eval; |
afbf3ca7 BA |
1103 | if (score != "*") { |
1104 | move.eval = | |
1105 | score == "1/2" | |
1106 | ? 0 | |
1107 | : (score == "1-0" ? 1 : -1) * maxeval; | |
3a2a7b5f BA |
1108 | } else move.eval = this.evalPosition(); |
1109 | if ( | |
1110 | // "next" is defined after sentry pushes | |
1111 | !!next && ( | |
1112 | !curEval || | |
1113 | color == 'w' && move.eval > curEval || | |
1114 | color == 'b' && move.eval < curEval | |
1115 | ) | |
1116 | ) { | |
1117 | move.second = next; | |
1118 | } | |
afbf3ca7 BA |
1119 | }; |
1120 | ||
1121 | // Just search_depth == 1 (because of sentries. TODO: can do better...) | |
1122 | moves1.forEach(m1 => { | |
1123 | this.play(m1); | |
1124 | if (this.subTurn == 1) setEval(m1); | |
1125 | else { | |
1126 | // Need to play every pushes and count: | |
1127 | const moves2 = this.getAllValidMoves(); | |
1128 | moves2.forEach(m2 => { | |
1129 | this.play(m2); | |
3a2a7b5f | 1130 | setEval(m1, m2); |
afbf3ca7 BA |
1131 | this.undo(m2); |
1132 | }); | |
1133 | } | |
1134 | this.undo(m1); | |
1135 | }); | |
1136 | ||
1137 | moves1.sort((a, b) => { | |
1138 | return (color == "w" ? 1 : -1) * (b.eval - a.eval); | |
1139 | }); | |
1140 | let candidates = [0]; | |
1141 | for (let j = 1; j < moves1.length && moves1[j].eval == moves1[0].eval; j++) | |
1142 | candidates.push(j); | |
3a2a7b5f BA |
1143 | const choice = moves1[candidates[randInt(candidates.length)]]; |
1144 | return (!choice.second ? choice : [choice, choice.second]); | |
afbf3ca7 BA |
1145 | } |
1146 | ||
f14572c4 BA |
1147 | // For moves notation: |
1148 | static get LANCER_DIRNAMES() { | |
1149 | return { | |
1150 | 'c': "N", | |
1151 | 'd': "NE", | |
1152 | 'e': "E", | |
1153 | 'f': "SE", | |
1154 | 'g': "S", | |
1155 | 'h': "SW", | |
1156 | 'm': "W", | |
1157 | 'o': "NW" | |
1158 | }; | |
1159 | } | |
1160 | ||
6b7b2cf7 BA |
1161 | getNotation(move) { |
1162 | // Special case "king takes jailer" is a pass move | |
1163 | if (move.appear.length == 0 && move.vanish.length == 0) return "pass"; | |
f14572c4 | 1164 | let notation = undefined; |
b0a0468a BA |
1165 | if (this.subTurn == 2) { |
1166 | // Do not consider appear[1] (sentry) for sentry pushes | |
1167 | const simpleMove = { | |
1168 | appear: [move.appear[0]], | |
1169 | vanish: move.vanish, | |
1170 | start: move.start, | |
1171 | end: move.end | |
1172 | }; | |
f14572c4 | 1173 | notation = super.getNotation(simpleMove); |
1b56b736 BA |
1174 | } |
1175 | else if ( | |
1176 | move.appear.length > 0 && | |
1177 | move.vanish[0].x == move.appear[0].x && | |
1178 | move.vanish[0].y == move.appear[0].y | |
1179 | ) { | |
1180 | // Lancer in-place reorientation: | |
1181 | notation = "L" + V.CoordsToSquare(move.start) + ":R"; | |
1182 | } | |
1183 | else notation = super.getNotation(move); | |
f14572c4 BA |
1184 | if (Object.keys(V.LANCER_DIRNAMES).includes(move.vanish[0].p)) |
1185 | // Lancer: add direction info | |
1186 | notation += "=" + V.LANCER_DIRNAMES[move.appear[0].p]; | |
7e476ce4 BA |
1187 | else if ( |
1188 | move.vanish[0].p == V.PAWN && | |
1189 | Object.keys(V.LANCER_DIRNAMES).includes(move.appear[0].p) | |
1190 | ) { | |
1191 | // Fix promotions in lancer: | |
2c5d7b20 BA |
1192 | notation = notation.slice(0, -1) + |
1193 | "L:" + V.LANCER_DIRNAMES[move.appear[0].p]; | |
7e476ce4 | 1194 | } |
f14572c4 | 1195 | return notation; |
6b7b2cf7 | 1196 | } |
2a8a94c9 | 1197 | }; |