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0c3fe8a6 BA |
1 | import { ChessRules } from "@/base_rules"; |
2 | import { ArrayFun } from "@/utils/array"; | |
3 | import { sample, randInt } from "@/utils/alea"; | |
4 | ||
32f6285e | 5 | export class WildebeestRules extends ChessRules { |
6808d7a1 BA |
6 | static get size() { |
7 | return { x: 10, y: 11 }; | |
8 | } | |
8a196305 | 9 | |
6808d7a1 BA |
10 | static get CAMEL() { |
11 | return "c"; | |
12 | } | |
13 | static get WILDEBEEST() { | |
14 | return "w"; | |
15 | } | |
a37076f1 | 16 | |
6808d7a1 BA |
17 | static get PIECES() { |
18 | return ChessRules.PIECES.concat([V.CAMEL, V.WILDEBEEST]); | |
dac39588 | 19 | } |
7931e479 | 20 | |
6808d7a1 | 21 | static get steps() { |
dac39588 | 22 | return Object.assign( |
6f2f9437 BA |
23 | {}, |
24 | ChessRules.steps, | |
25 | // Add camel moves: | |
6808d7a1 BA |
26 | { |
27 | c: [ | |
28 | [-3, -1], | |
29 | [-3, 1], | |
30 | [-1, -3], | |
31 | [-1, 3], | |
32 | [1, -3], | |
33 | [1, 3], | |
34 | [3, -1], | |
35 | [3, 1] | |
36 | ] | |
37 | } | |
dac39588 BA |
38 | ); |
39 | } | |
a37076f1 | 40 | |
6808d7a1 BA |
41 | static IsGoodEnpassant(enpassant) { |
42 | if (enpassant != "-") { | |
dac39588 | 43 | const squares = enpassant.split(","); |
6808d7a1 BA |
44 | if (squares.length > 2) return false; |
45 | for (let sq of squares) { | |
dac39588 | 46 | const ep = V.SquareToCoords(sq); |
6808d7a1 | 47 | if (isNaN(ep.x) || !V.OnBoard(ep)) return false; |
dac39588 BA |
48 | } |
49 | } | |
50 | return true; | |
51 | } | |
6e62b1c7 | 52 | |
241bf8f2 BA |
53 | getPpath(b) { |
54 | return ([V.CAMEL, V.WILDEBEEST].includes(b[1]) ? "Wildebeest/" : "") + b; | |
55 | } | |
56 | ||
dac39588 | 57 | // There may be 2 enPassant squares (if pawn jump 3 squares) |
6808d7a1 | 58 | getEnpassantFen() { |
dac39588 | 59 | const L = this.epSquares.length; |
6808d7a1 | 60 | if (!this.epSquares[L - 1]) return "-"; //no en-passant |
dac39588 | 61 | let res = ""; |
6808d7a1 | 62 | this.epSquares[L - 1].forEach(sq => { |
dac39588 BA |
63 | res += V.CoordsToSquare(sq) + ","; |
64 | }); | |
6808d7a1 | 65 | return res.slice(0, -1); //remove last comma |
dac39588 | 66 | } |
2d7194bd | 67 | |
dac39588 | 68 | // En-passant after 2-sq or 3-sq jumps |
6808d7a1 BA |
69 | getEpSquare(moveOrSquare) { |
70 | if (!moveOrSquare) return undefined; | |
71 | if (typeof moveOrSquare === "string") { | |
dac39588 | 72 | const square = moveOrSquare; |
6808d7a1 | 73 | if (square == "-") return undefined; |
dac39588 BA |
74 | let res = []; |
75 | square.split(",").forEach(sq => { | |
76 | res.push(V.SquareToCoords(sq)); | |
77 | }); | |
78 | return res; | |
79 | } | |
80 | // Argument is a move: | |
81 | const move = moveOrSquare; | |
6808d7a1 BA |
82 | const [sx, sy, ex] = [move.start.x, move.start.y, move.end.x]; |
83 | if (this.getPiece(sx, sy) == V.PAWN && Math.abs(sx - ex) >= 2) { | |
84 | const step = (ex - sx) / Math.abs(ex - sx); | |
85 | let res = [ | |
86 | { | |
87 | x: sx + step, | |
88 | y: sy | |
89 | } | |
90 | ]; | |
91 | if (sx + 2 * step != ex) { | |
92 | //3-squares move | |
dac39588 | 93 | res.push({ |
6808d7a1 | 94 | x: sx + 2 * step, |
dac39588 BA |
95 | y: sy |
96 | }); | |
97 | } | |
98 | return res; | |
99 | } | |
100 | return undefined; //default | |
101 | } | |
a37076f1 | 102 | |
6808d7a1 BA |
103 | getPotentialMovesFrom([x, y]) { |
104 | switch (this.getPiece(x, y)) { | |
dac39588 | 105 | case V.CAMEL: |
6808d7a1 | 106 | return this.getPotentialCamelMoves([x, y]); |
dac39588 | 107 | case V.WILDEBEEST: |
6808d7a1 | 108 | return this.getPotentialWildebeestMoves([x, y]); |
dac39588 | 109 | default: |
6808d7a1 | 110 | return super.getPotentialMovesFrom([x, y]); |
dac39588 BA |
111 | } |
112 | } | |
a37076f1 | 113 | |
dac39588 | 114 | // Pawns jump 2 or 3 squares, and promote to queen or wildebeest |
6808d7a1 | 115 | getPotentialPawnMoves([x, y]) { |
dac39588 BA |
116 | const color = this.turn; |
117 | let moves = []; | |
6808d7a1 BA |
118 | const [sizeX, sizeY] = [V.size.x, V.size.y]; |
119 | const shiftX = color == "w" ? -1 : 1; | |
120 | const startRanks = color == "w" ? [sizeX - 2, sizeX - 3] : [1, 2]; | |
121 | const lastRank = color == "w" ? 0 : sizeX - 1; | |
e3ef199c BA |
122 | const finalPieces = x + shiftX == lastRank |
123 | ? [V.WILDEBEEST, V.QUEEN] | |
124 | : [V.PAWN]; | |
a37076f1 | 125 | |
6808d7a1 | 126 | if (this.board[x + shiftX][y] == V.EMPTY) { |
dac39588 BA |
127 | // One square forward |
128 | for (let piece of finalPieces) | |
6808d7a1 BA |
129 | moves.push( |
130 | this.getBasicMove([x, y], [x + shiftX, y], { c: color, p: piece }) | |
131 | ); | |
132 | if (startRanks.includes(x)) { | |
133 | if (this.board[x + 2 * shiftX][y] == V.EMPTY) { | |
dac39588 | 134 | // Two squares jump |
6808d7a1 BA |
135 | moves.push(this.getBasicMove([x, y], [x + 2 * shiftX, y])); |
136 | if (x == startRanks[0] && this.board[x + 3 * shiftX][y] == V.EMPTY) { | |
dac39588 | 137 | // Three squares jump |
6808d7a1 | 138 | moves.push(this.getBasicMove([x, y], [x + 3 * shiftX, y])); |
dac39588 BA |
139 | } |
140 | } | |
141 | } | |
142 | } | |
143 | // Captures | |
6808d7a1 BA |
144 | for (let shiftY of [-1, 1]) { |
145 | if ( | |
146 | y + shiftY >= 0 && | |
147 | y + shiftY < sizeY && | |
148 | this.board[x + shiftX][y + shiftY] != V.EMPTY && | |
149 | this.canTake([x, y], [x + shiftX, y + shiftY]) | |
150 | ) { | |
151 | for (let piece of finalPieces) { | |
152 | moves.push( | |
153 | this.getBasicMove([x, y], [x + shiftX, y + shiftY], { | |
154 | c: color, | |
155 | p: piece | |
156 | }) | |
157 | ); | |
dac39588 BA |
158 | } |
159 | } | |
160 | } | |
a37076f1 | 161 | |
dac39588 BA |
162 | // En passant |
163 | const Lep = this.epSquares.length; | |
6808d7a1 BA |
164 | const epSquare = this.epSquares[Lep - 1]; |
165 | if (epSquare) { | |
166 | for (let epsq of epSquare) { | |
dac39588 | 167 | // TODO: some redundant checks |
6808d7a1 BA |
168 | if (epsq.x == x + shiftX && Math.abs(epsq.y - y) == 1) { |
169 | var enpassantMove = this.getBasicMove([x, y], [epsq.x, epsq.y]); | |
dac39588 BA |
170 | // WARNING: the captured pawn may be diagonally behind us, |
171 | // if it's a 3-squares jump and we take on 1st passing square | |
6808d7a1 | 172 | const px = this.board[x][epsq.y] != V.EMPTY ? x : x - shiftX; |
dac39588 BA |
173 | enpassantMove.vanish.push({ |
174 | x: px, | |
175 | y: epsq.y, | |
6808d7a1 BA |
176 | p: "p", |
177 | c: this.getColor(px, epsq.y) | |
dac39588 BA |
178 | }); |
179 | moves.push(enpassantMove); | |
180 | } | |
181 | } | |
182 | } | |
a37076f1 | 183 | |
dac39588 BA |
184 | return moves; |
185 | } | |
a37076f1 | 186 | |
dac39588 | 187 | // TODO: wildebeest castle |
8a196305 | 188 | |
6808d7a1 | 189 | getPotentialCamelMoves(sq) { |
dac39588 BA |
190 | return this.getSlideNJumpMoves(sq, V.steps[V.CAMEL], "oneStep"); |
191 | } | |
a37076f1 | 192 | |
6808d7a1 | 193 | getPotentialWildebeestMoves(sq) { |
dac39588 | 194 | return this.getSlideNJumpMoves( |
6808d7a1 BA |
195 | sq, |
196 | V.steps[V.KNIGHT].concat(V.steps[V.CAMEL]), | |
197 | "oneStep" | |
198 | ); | |
dac39588 | 199 | } |
a37076f1 | 200 | |
68e19a44 | 201 | isAttacked(sq, color) { |
6808d7a1 | 202 | return ( |
68e19a44 BA |
203 | super.isAttacked(sq, color) || |
204 | this.isAttackedByCamel(sq, color) || | |
205 | this.isAttackedByWildebeest(sq, color) | |
6808d7a1 | 206 | ); |
dac39588 | 207 | } |
a37076f1 | 208 | |
68e19a44 | 209 | isAttackedByCamel(sq, color) { |
6808d7a1 BA |
210 | return this.isAttackedBySlideNJump( |
211 | sq, | |
68e19a44 | 212 | color, |
6808d7a1 BA |
213 | V.CAMEL, |
214 | V.steps[V.CAMEL], | |
215 | "oneStep" | |
216 | ); | |
dac39588 | 217 | } |
a37076f1 | 218 | |
68e19a44 | 219 | isAttackedByWildebeest(sq, color) { |
6808d7a1 BA |
220 | return this.isAttackedBySlideNJump( |
221 | sq, | |
68e19a44 | 222 | color, |
6808d7a1 BA |
223 | V.WILDEBEEST, |
224 | V.steps[V.KNIGHT].concat(V.steps[V.CAMEL]), | |
225 | "oneStep" | |
226 | ); | |
dac39588 | 227 | } |
a37076f1 | 228 | |
6808d7a1 | 229 | getCurrentScore() { |
bb688df5 | 230 | if (this.atLeastOneMove()) return "*"; |
dac39588 | 231 | // No valid move: game is lost (stalemate is a win) |
6808d7a1 | 232 | return this.turn == "w" ? "0-1" : "1-0"; |
dac39588 | 233 | } |
efb20746 | 234 | |
dac39588 BA |
235 | static get VALUES() { |
236 | return Object.assign( | |
a97bdbda BA |
237 | { c: 3, w: 7 }, //experimental |
238 | ChessRules.VALUES | |
dac39588 BA |
239 | ); |
240 | } | |
a37076f1 | 241 | |
6808d7a1 BA |
242 | static get SEARCH_DEPTH() { |
243 | return 2; | |
244 | } | |
3c09dc49 | 245 | |
7ba4a5bc BA |
246 | static GenRandInitFen(randomness) { |
247 | if (!randomness) randomness = 2; | |
248 | if (randomness == 0) | |
6f2f9437 | 249 | return "rnccwkqbbnr/ppppppppppp/92/92/92/92/92/92/PPPPPPPPPPP/RNBBQKWCCNR w 0 akak -"; |
7ba4a5bc | 250 | |
6f2f9437 | 251 | let pieces = { w: new Array(11), b: new Array(11) }; |
3a2a7b5f | 252 | let flags = ""; |
6808d7a1 | 253 | for (let c of ["w", "b"]) { |
7ba4a5bc BA |
254 | if (c == 'b' && randomness == 1) { |
255 | pieces['b'] = pieces['w']; | |
3a2a7b5f | 256 | flags += flags; |
7ba4a5bc BA |
257 | break; |
258 | } | |
259 | ||
dac39588 | 260 | let positions = ArrayFun.range(11); |
a37076f1 | 261 | |
dac39588 | 262 | // Get random squares for bishops + camels (different colors) |
6808d7a1 BA |
263 | let randIndexes = sample(ArrayFun.range(6), 2).map(i => { |
264 | return 2 * i; | |
265 | }); | |
dac39588 BA |
266 | let bishop1Pos = positions[randIndexes[0]]; |
267 | let camel1Pos = positions[randIndexes[1]]; | |
268 | // The second bishop (camel) must be on a square of different color | |
6808d7a1 BA |
269 | let randIndexes_tmp = sample(ArrayFun.range(5), 2).map(i => { |
270 | return 2 * i + 1; | |
271 | }); | |
dac39588 BA |
272 | let bishop2Pos = positions[randIndexes_tmp[0]]; |
273 | let camel2Pos = positions[randIndexes_tmp[1]]; | |
6808d7a1 BA |
274 | for (let idx of randIndexes.concat(randIndexes_tmp).sort((a, b) => { |
275 | return b - a; | |
276 | })) { | |
7ba4a5bc | 277 | // Largest indices first |
dac39588 BA |
278 | positions.splice(idx, 1); |
279 | } | |
a37076f1 | 280 | |
dac39588 BA |
281 | let randIndex = randInt(7); |
282 | let knight1Pos = positions[randIndex]; | |
283 | positions.splice(randIndex, 1); | |
284 | randIndex = randInt(6); | |
285 | let knight2Pos = positions[randIndex]; | |
286 | positions.splice(randIndex, 1); | |
a37076f1 | 287 | |
dac39588 BA |
288 | randIndex = randInt(5); |
289 | let queenPos = positions[randIndex]; | |
290 | positions.splice(randIndex, 1); | |
8a196305 | 291 | |
dac39588 BA |
292 | // Random square for wildebeest |
293 | randIndex = randInt(4); | |
294 | let wildebeestPos = positions[randIndex]; | |
295 | positions.splice(randIndex, 1); | |
8a196305 | 296 | |
dac39588 BA |
297 | let rook1Pos = positions[0]; |
298 | let kingPos = positions[1]; | |
299 | let rook2Pos = positions[2]; | |
a37076f1 | 300 | |
6808d7a1 BA |
301 | pieces[c][rook1Pos] = "r"; |
302 | pieces[c][knight1Pos] = "n"; | |
303 | pieces[c][bishop1Pos] = "b"; | |
304 | pieces[c][queenPos] = "q"; | |
305 | pieces[c][camel1Pos] = "c"; | |
306 | pieces[c][camel2Pos] = "c"; | |
307 | pieces[c][wildebeestPos] = "w"; | |
308 | pieces[c][kingPos] = "k"; | |
309 | pieces[c][bishop2Pos] = "b"; | |
310 | pieces[c][knight2Pos] = "n"; | |
311 | pieces[c][rook2Pos] = "r"; | |
3a2a7b5f | 312 | flags += V.CoordToColumn(rook1Pos) + V.CoordToColumn(rook2Pos); |
dac39588 | 313 | } |
6808d7a1 BA |
314 | return ( |
315 | pieces["b"].join("") + | |
6f2f9437 | 316 | "/ppppppppppp/92/92/92/92/92/92/PPPPPPPPPPP/" + |
dac39588 | 317 | pieces["w"].join("").toUpperCase() + |
3a2a7b5f | 318 | " w 0 " + flags + " -" |
6808d7a1 | 319 | ); |
dac39588 | 320 | } |
6808d7a1 | 321 | }; |