Attempt to clarify installation instructions a little
[vchess.git] / client / src / variants / Wildebeest.js
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83cecc0f 1import { ChessRules, Move, PiPo } from "@/base_rules";
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2import { ArrayFun } from "@/utils/array";
3import { sample, randInt } from "@/utils/alea";
4
32f6285e 5export class WildebeestRules extends ChessRules {
7e8a7ea1 6
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7 static get size() {
8 return { x: 10, y: 11 };
9 }
8a196305 10
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11 static get CAMEL() {
12 return "c";
13 }
14 static get WILDEBEEST() {
15 return "w";
16 }
a37076f1 17
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18 static get PIECES() {
19 return ChessRules.PIECES.concat([V.CAMEL, V.WILDEBEEST]);
dac39588 20 }
7931e479 21
6808d7a1 22 static get steps() {
dac39588 23 return Object.assign(
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24 {},
25 ChessRules.steps,
26 // Add camel moves:
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27 {
28 c: [
29 [-3, -1],
30 [-3, 1],
31 [-1, -3],
32 [-1, 3],
33 [1, -3],
34 [1, 3],
35 [3, -1],
36 [3, 1]
37 ]
38 }
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39 );
40 }
a37076f1 41
6808d7a1 42 static IsGoodEnpassant(enpassant) {
472c0c4f 43 if (enpassant != "-") return !!enpassant.match(/^([a-j][0-9]{1,2},?)+$/);
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44 return true;
45 }
6e62b1c7 46
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47 getPpath(b) {
48 return ([V.CAMEL, V.WILDEBEEST].includes(b[1]) ? "Wildebeest/" : "") + b;
49 }
50
dac39588 51 // There may be 2 enPassant squares (if pawn jump 3 squares)
6808d7a1 52 getEnpassantFen() {
dac39588 53 const L = this.epSquares.length;
6808d7a1 54 if (!this.epSquares[L - 1]) return "-"; //no en-passant
dac39588 55 let res = "";
6808d7a1 56 this.epSquares[L - 1].forEach(sq => {
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57 res += V.CoordsToSquare(sq) + ",";
58 });
6808d7a1 59 return res.slice(0, -1); //remove last comma
dac39588 60 }
2d7194bd 61
dac39588 62 // En-passant after 2-sq or 3-sq jumps
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63 getEpSquare(moveOrSquare) {
64 if (!moveOrSquare) return undefined;
65 if (typeof moveOrSquare === "string") {
dac39588 66 const square = moveOrSquare;
6808d7a1 67 if (square == "-") return undefined;
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68 let res = [];
69 square.split(",").forEach(sq => {
70 res.push(V.SquareToCoords(sq));
71 });
72 return res;
73 }
74 // Argument is a move:
75 const move = moveOrSquare;
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76 const [sx, sy, ex] = [move.start.x, move.start.y, move.end.x];
77 if (this.getPiece(sx, sy) == V.PAWN && Math.abs(sx - ex) >= 2) {
78 const step = (ex - sx) / Math.abs(ex - sx);
79 let res = [
80 {
81 x: sx + step,
82 y: sy
83 }
84 ];
85 if (sx + 2 * step != ex) {
a538d4b0 86 // 3-squares move
dac39588 87 res.push({
6808d7a1 88 x: sx + 2 * step,
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89 y: sy
90 });
91 }
92 return res;
93 }
94 return undefined; //default
95 }
a37076f1 96
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97 getPotentialMovesFrom([x, y]) {
98 switch (this.getPiece(x, y)) {
dac39588 99 case V.CAMEL:
6808d7a1 100 return this.getPotentialCamelMoves([x, y]);
dac39588 101 case V.WILDEBEEST:
6808d7a1 102 return this.getPotentialWildebeestMoves([x, y]);
dac39588 103 default:
6808d7a1 104 return super.getPotentialMovesFrom([x, y]);
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105 }
106 }
a37076f1 107
dac39588 108 // Pawns jump 2 or 3 squares, and promote to queen or wildebeest
6808d7a1 109 getPotentialPawnMoves([x, y]) {
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110 const color = this.turn;
111 let moves = [];
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112 const [sizeX, sizeY] = [V.size.x, V.size.y];
113 const shiftX = color == "w" ? -1 : 1;
114 const startRanks = color == "w" ? [sizeX - 2, sizeX - 3] : [1, 2];
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115 const lastRanks = color == "w" ? [0, 1] : [sizeX - 1, sizeX -2];
116 let finalPieces = [V.PAWN];
117 if (x + shiftX == lastRanks[1])
118 Array.prototype.push.apply(finalPieces, [V.WILDEBEEST, V.QUEEN]);
119 else if (x + shiftX == lastRanks[0])
120 finalPieces = [V.WILDEBEEST, V.QUEEN];
a37076f1 121
6808d7a1 122 if (this.board[x + shiftX][y] == V.EMPTY) {
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123 // One square forward
124 for (let piece of finalPieces)
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125 moves.push(
126 this.getBasicMove([x, y], [x + shiftX, y], { c: color, p: piece })
127 );
128 if (startRanks.includes(x)) {
129 if (this.board[x + 2 * shiftX][y] == V.EMPTY) {
dac39588 130 // Two squares jump
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131 moves.push(this.getBasicMove([x, y], [x + 2 * shiftX, y]));
132 if (x == startRanks[0] && this.board[x + 3 * shiftX][y] == V.EMPTY) {
dac39588 133 // Three squares jump
6808d7a1 134 moves.push(this.getBasicMove([x, y], [x + 3 * shiftX, y]));
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135 }
136 }
137 }
138 }
139 // Captures
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140 for (let shiftY of [-1, 1]) {
141 if (
142 y + shiftY >= 0 &&
143 y + shiftY < sizeY &&
144 this.board[x + shiftX][y + shiftY] != V.EMPTY &&
145 this.canTake([x, y], [x + shiftX, y + shiftY])
146 ) {
147 for (let piece of finalPieces) {
148 moves.push(
149 this.getBasicMove([x, y], [x + shiftX, y + shiftY], {
150 c: color,
151 p: piece
152 })
153 );
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154 }
155 }
156 }
a37076f1 157
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158 // En passant
159 const Lep = this.epSquares.length;
6808d7a1 160 const epSquare = this.epSquares[Lep - 1];
472c0c4f 161 if (!!epSquare) {
6808d7a1 162 for (let epsq of epSquare) {
dac39588 163 // TODO: some redundant checks
6808d7a1 164 if (epsq.x == x + shiftX && Math.abs(epsq.y - y) == 1) {
f52671e5 165 let enpassantMove = this.getBasicMove([x, y], [epsq.x, epsq.y]);
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166 // WARNING: the captured pawn may be diagonally behind us,
167 // if it's a 3-squares jump and we take on 1st passing square
6808d7a1 168 const px = this.board[x][epsq.y] != V.EMPTY ? x : x - shiftX;
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169 enpassantMove.vanish.push({
170 x: px,
171 y: epsq.y,
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172 p: "p",
173 c: this.getColor(px, epsq.y)
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174 });
175 moves.push(enpassantMove);
176 }
177 }
178 }
a37076f1 179
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180 return moves;
181 }
a37076f1 182
6808d7a1 183 getPotentialCamelMoves(sq) {
4313762d 184 return this.getSlideNJumpMoves(sq, V.steps[V.CAMEL], 1);
dac39588 185 }
a37076f1 186
6808d7a1 187 getPotentialWildebeestMoves(sq) {
dac39588 188 return this.getSlideNJumpMoves(
4313762d 189 sq, V.steps[V.KNIGHT].concat(V.steps[V.CAMEL]), 1);
dac39588 190 }
a37076f1 191
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192 getPPpath(m) {
193 if (
194 m.appear.length == 2 && m.vanish.length == 2 &&
195 Math.abs(m.end.y - m.start.y) == 1 &&
196 this.board[m.end.x][m.end.y] == V.EMPTY
197 ) {
198 // Castle, king moved by one square only, not directly onto rook
199 return "Wildebeest/castle";
200 }
201 return super.getPPpath(m);
202 }
203
204 // Special Wildebeest castling rules:
205 getCastleMoves([x, y]) {
206 const c = this.getColor(x, y);
207 const oppCol = V.GetOppCol(c);
208 let moves = [];
209 let i = 0;
210 const castlingKing = this.board[x][y].charAt(1);
211 castlingCheck: for (
212 let castleSide = 0;
213 castleSide < 2;
214 castleSide++ //"large", then "small"
215 ) {
216 if (this.castleFlags[c][castleSide] >= V.size.y) continue;
217 // Rook and king are on initial position
218 const rookPos = this.castleFlags[c][castleSide];
219 const range = (castleSide == 0 ? [rookPos, y] : [y, rookPos]);
220
221 // King and rook must be connected:
222 for (let i = range[0] + 1; i <= range[1] - 1; i++) {
223 if (this.board[x][i] != V.EMPTY) continue castlingCheck;
224 }
225 const step = 2 * castleSide - 1;
226 // No attacks on the path of the king ?
227 for (let i = range[0]; i <= range[1]; i++) {
228 if (i != rookPos && this.isAttacked([x, i], oppCol))
229 continue castlingCheck;
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230 if (
231 i != y &&
232 // Do not end in the corner, except if starting square is too near
233 (i > 0 || y == 1) &&
234 (i < V.size.y - 1 || y == V.size.y - 2)
235 ) {
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236 // Found a possible castle move:
237 moves.push(
238 new Move({
239 appear: [
240 new PiPo({
241 x: x,
242 y: i,
243 p: V.KING,
244 c: c
245 }),
246 new PiPo({
247 x: x,
248 y: i - step,
249 p: V.ROOK,
250 c: c
251 })
252 ],
253 vanish: [
254 new PiPo({ x: x, y: y, p: V.KING, c: c }),
255 new PiPo({ x: x, y: rookPos, p: V.ROOK, c: c })
256 ]
257 })
258 );
259 }
260 }
261 }
262
263 return moves;
264 }
265
68e19a44 266 isAttacked(sq, color) {
6808d7a1 267 return (
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268 super.isAttacked(sq, color) ||
269 this.isAttackedByCamel(sq, color) ||
270 this.isAttackedByWildebeest(sq, color)
6808d7a1 271 );
dac39588 272 }
a37076f1 273
68e19a44 274 isAttackedByCamel(sq, color) {
6808d7a1 275 return this.isAttackedBySlideNJump(
4313762d 276 sq, color, V.CAMEL, V.steps[V.CAMEL], 1);
dac39588 277 }
a37076f1 278
68e19a44 279 isAttackedByWildebeest(sq, color) {
6808d7a1 280 return this.isAttackedBySlideNJump(
4313762d 281 sq, color, V.WILDEBEEST, V.steps[V.KNIGHT].concat(V.steps[V.CAMEL]), 1);
dac39588 282 }
a37076f1 283
6808d7a1 284 getCurrentScore() {
bb688df5 285 if (this.atLeastOneMove()) return "*";
dac39588 286 // No valid move: game is lost (stalemate is a win)
6808d7a1 287 return this.turn == "w" ? "0-1" : "1-0";
dac39588 288 }
efb20746 289
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290 static get VALUES() {
291 return Object.assign(
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292 { c: 3, w: 7 }, //experimental
293 ChessRules.VALUES
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294 );
295 }
a37076f1 296
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297 static get SEARCH_DEPTH() {
298 return 2;
299 }
3c09dc49 300
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301 static GenRandInitFen(options) {
302 if (options.randomness == 0) {
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303 return (
304 "rnccwkqbbnr/ppppppppppp/92/92/92/92/92/92/PPPPPPPPPPP/RNBBQKWCCNR " +
305 "w 0 akak -"
306 );
307 }
7ba4a5bc 308
6f2f9437 309 let pieces = { w: new Array(11), b: new Array(11) };
3a2a7b5f 310 let flags = "";
6808d7a1 311 for (let c of ["w", "b"]) {
4313762d 312 if (c == 'b' && options.randomness == 1) {
7ba4a5bc 313 pieces['b'] = pieces['w'];
3a2a7b5f 314 flags += flags;
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315 break;
316 }
317
dac39588 318 let positions = ArrayFun.range(11);
a37076f1 319
dac39588 320 // Get random squares for bishops + camels (different colors)
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321 let randIndexes = sample(ArrayFun.range(6), 2).map(i => {
322 return 2 * i;
323 });
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324 let bishop1Pos = positions[randIndexes[0]];
325 let camel1Pos = positions[randIndexes[1]];
326 // The second bishop (camel) must be on a square of different color
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327 let randIndexes_tmp = sample(ArrayFun.range(5), 2).map(i => {
328 return 2 * i + 1;
329 });
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330 let bishop2Pos = positions[randIndexes_tmp[0]];
331 let camel2Pos = positions[randIndexes_tmp[1]];
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332 for (let idx of randIndexes.concat(randIndexes_tmp).sort((a, b) => {
333 return b - a;
334 })) {
7ba4a5bc 335 // Largest indices first
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336 positions.splice(idx, 1);
337 }
a37076f1 338
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339 let randIndex = randInt(7);
340 let knight1Pos = positions[randIndex];
341 positions.splice(randIndex, 1);
342 randIndex = randInt(6);
343 let knight2Pos = positions[randIndex];
344 positions.splice(randIndex, 1);
a37076f1 345
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346 randIndex = randInt(5);
347 let queenPos = positions[randIndex];
348 positions.splice(randIndex, 1);
8a196305 349
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350 // Random square for wildebeest
351 randIndex = randInt(4);
352 let wildebeestPos = positions[randIndex];
353 positions.splice(randIndex, 1);
8a196305 354
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355 let rook1Pos = positions[0];
356 let kingPos = positions[1];
357 let rook2Pos = positions[2];
a37076f1 358
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359 pieces[c][rook1Pos] = "r";
360 pieces[c][knight1Pos] = "n";
361 pieces[c][bishop1Pos] = "b";
362 pieces[c][queenPos] = "q";
363 pieces[c][camel1Pos] = "c";
364 pieces[c][camel2Pos] = "c";
365 pieces[c][wildebeestPos] = "w";
366 pieces[c][kingPos] = "k";
367 pieces[c][bishop2Pos] = "b";
368 pieces[c][knight2Pos] = "n";
369 pieces[c][rook2Pos] = "r";
3a2a7b5f 370 flags += V.CoordToColumn(rook1Pos) + V.CoordToColumn(rook2Pos);
dac39588 371 }
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372 return (
373 pieces["b"].join("") +
6f2f9437 374 "/ppppppppppp/92/92/92/92/92/92/PPPPPPPPPPP/" +
dac39588 375 pieces["w"].join("").toUpperCase() +
3a2a7b5f 376 " w 0 " + flags + " -"
6808d7a1 377 );
dac39588 378 }
7e8a7ea1 379
6808d7a1 380};