Separate client and server codes. Keep everything in one git repo for simplicity
[vchess.git] / client / client_OLD / javascripts / variants / Wildebeest.js
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8a196305 1class WildebeestRules extends ChessRules
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2{
3 static getPpath(b)
4 {
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5 return ([V.CAMEL,V.WILDEBEEST].includes(b[1]) ? "Wildebeest/" : "") + b;
6 }
7
0b7d99ec 8 static get size() { return {x:10,y:11}; }
8a196305 9
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10 static get CAMEL() { return 'c'; }
11 static get WILDEBEEST() { return 'w'; }
12
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13 static get PIECES()
14 {
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15 return ChessRules.PIECES.concat([V.CAMEL,V.WILDEBEEST]);
16 }
17
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18 static get steps()
19 {
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20 return Object.assign(
21 ChessRules.steps, //add camel moves:
22 {'c': [ [-3,-1],[-3,1],[-1,-3],[-1,3],[1,-3],[1,3],[3,-1],[3,1] ]}
23 );
24 }
25
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26 static IsGoodEnpassant(enpassant)
27 {
28 if (enpassant != "-")
29 {
30 const squares = enpassant.split(",");
31 if (squares.length > 2)
32 return false;
33 for (let sq of squares)
34 {
35 const ep = V.SquareToCoords(sq);
36 if (isNaN(ep.x) || !V.OnBoard(ep))
37 return false;
38 }
39 }
40 return true;
41 }
42
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43 // There may be 2 enPassant squares (if pawn jump 3 squares)
44 getEnpassantFen()
45 {
46 const L = this.epSquares.length;
47 if (!this.epSquares[L-1])
48 return "-"; //no en-passant
49 let res = "";
50 this.epSquares[L-1].forEach(sq => {
51 res += V.CoordsToSquare(sq) + ",";
52 });
53 return res.slice(0,-1); //remove last comma
54 }
55
8a196305 56 // En-passant after 2-sq or 3-sq jumps
2d7194bd 57 getEpSquare(moveOrSquare)
a37076f1 58 {
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59 if (!moveOrSquare)
60 return undefined;
61 if (typeof moveOrSquare === "string")
62 {
63 const square = moveOrSquare;
64 if (square == "-")
65 return undefined;
66 let res = [];
67 square.split(",").forEach(sq => {
68 res.push(V.SquareToCoords(sq));
69 });
70 return res;
71 }
72 // Argument is a move:
73 const move = moveOrSquare;
a37076f1 74 const [sx,sy,ex] = [move.start.x,move.start.y,move.end.x];
0b7d99ec 75 if (this.getPiece(sx,sy) == V.PAWN && Math.abs(sx - ex) >= 2)
a37076f1 76 {
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77 const step = (ex-sx) / Math.abs(ex-sx);
78 let res = [{
79 x: sx + step,
a37076f1 80 y: sy
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81 }];
82 if (sx + 2*step != ex) //3-squares move
83 {
84 res.push({
85 x: sx + 2*step,
86 y: sy
87 });
88 }
89 return res;
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90 }
91 return undefined; //default
92 }
93
94 getPotentialMovesFrom([x,y])
95 {
96 switch (this.getPiece(x,y))
97 {
0b7d99ec 98 case V.CAMEL:
a37076f1 99 return this.getPotentialCamelMoves([x,y]);
0b7d99ec 100 case V.WILDEBEEST:
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101 return this.getPotentialWildebeestMoves([x,y]);
102 default:
103 return super.getPotentialMovesFrom([x,y])
104 }
105 }
106
8a196305 107 // Pawns jump 2 or 3 squares, and promote to queen or wildebeest
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108 getPotentialPawnMoves([x,y])
109 {
110 const color = this.turn;
111 let moves = [];
0b7d99ec 112 const [sizeX,sizeY] = [V.size.x,V.size.y];
69f3d801 113 const shiftX = (color == "w" ? -1 : 1);
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114 const startRanks = (color == "w" ? [sizeX-2,sizeX-3] : [1,2]);
115 const lastRank = (color == "w" ? 0 : sizeX-1);
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116 const finalPieces = x + shiftX == lastRank
117 ? [V.ROOK,V.KNIGHT,V.BISHOP,V.QUEEN]
118 : [V.PAWN];
a37076f1 119
69f3d801 120 if (this.board[x+shiftX][y] == V.EMPTY)
a37076f1 121 {
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122 // One square forward
123 for (let piece of finalPieces)
124 moves.push(this.getBasicMove([x,y], [x+shiftX,y], {c:color,p:piece}));
125 if (startRanks.includes(x))
a37076f1 126 {
69f3d801 127 if (this.board[x+2*shiftX][y] == V.EMPTY)
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128 {
129 // Two squares jump
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130 moves.push(this.getBasicMove([x,y], [x+2*shiftX,y]));
131 if (x==startRanks[0] && this.board[x+3*shiftX][y] == V.EMPTY)
8a196305 132 {
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133 // Three squares jump
134 moves.push(this.getBasicMove([x,y], [x+3*shiftX,y]));
8a196305 135 }
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136 }
137 }
a37076f1 138 }
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139 // Captures
140 for (let shiftY of [-1,1])
a37076f1 141 {
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142 if (y + shiftY >= 0 && y + shiftY < sizeY
143 && this.board[x+shiftX][y+shiftY] != V.EMPTY
144 && this.canTake([x,y], [x+shiftX,y+shiftY]))
145 {
146 for (let piece of finalPieces)
92342261 147 {
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148 moves.push(this.getBasicMove([x,y], [x+shiftX,y+shiftY],
149 {c:color,p:piece}));
92342261 150 }
69f3d801 151 }
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152 }
153
154 // En passant
155 const Lep = this.epSquares.length;
69f3d801 156 const epSquare = this.epSquares[Lep-1];
8a196305 157 if (!!epSquare)
a37076f1 158 {
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159 for (let epsq of epSquare)
160 {
161 // TODO: some redundant checks
69f3d801 162 if (epsq.x == x+shiftX && Math.abs(epsq.y - y) == 1)
8a196305 163 {
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164 var enpassantMove = this.getBasicMove([x,y], [epsq.x,epsq.y]);
165 // WARNING: the captured pawn may be diagonally behind us,
166 // if it's a 3-squares jump and we take on 1st passing square
167 const px = (this.board[x][epsq.y] != V.EMPTY ? x : x - shiftX);
8a196305 168 enpassantMove.vanish.push({
69f3d801 169 x: px,
375ecdd1 170 y: epsq.y,
8a196305 171 p: 'p',
69f3d801 172 c: this.getColor(px,epsq.y)
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173 });
174 moves.push(enpassantMove);
175 }
176 }
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177 }
178
179 return moves;
180 }
181
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182 // TODO: wildebeest castle
183
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184 getPotentialCamelMoves(sq)
185 {
0b7d99ec 186 return this.getSlideNJumpMoves(sq, V.steps[V.CAMEL], "oneStep");
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187 }
188
189 getPotentialWildebeestMoves(sq)
190 {
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191 return this.getSlideNJumpMoves(
192 sq, V.steps[V.KNIGHT].concat(V.steps[V.CAMEL]), "oneStep");
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193 }
194
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195 isAttacked(sq, colors)
196 {
8a196305 197 return super.isAttacked(sq, colors)
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198 || this.isAttackedByCamel(sq, colors)
199 || this.isAttackedByWildebeest(sq, colors);
200 }
201
202 isAttackedByCamel(sq, colors)
203 {
204 return this.isAttackedBySlideNJump(sq, colors,
0b7d99ec 205 V.CAMEL, V.steps[V.CAMEL], "oneStep");
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206 }
207
208 isAttackedByWildebeest(sq, colors)
209 {
a37076f1 210 return this.isAttackedBySlideNJump(sq, colors, V.WILDEBEEST,
cf130369 211 V.steps[V.KNIGHT].concat(V.steps[V.CAMEL]), "oneStep");
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212 }
213
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214 checkGameEnd()
215 {
216 // No valid move: game is lost (stalemate is a win)
217 return this.turn == "w" ? "0-1" : "1-0";
218 }
efb20746 219
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220 static get VALUES() {
221 return Object.assign(
222 ChessRules.VALUES,
223 {'c': 3, 'w': 7} //experimental
224 );
225 }
226
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227 static get SEARCH_DEPTH() { return 2; }
228
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229 static GenRandInitFen()
230 {
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231 let pieces = { "w": new Array(10), "b": new Array(10) };
232 for (let c of ["w","b"])
a37076f1 233 {
8a196305 234 let positions = _.range(11);
a37076f1 235
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236 // Get random squares for bishops + camels (different colors)
237 let randIndexes = _.sample(_.range(6), 2).map(i => { return 2*i; });
238 let bishop1Pos = positions[randIndexes[0]];
239 let camel1Pos = positions[randIndexes[1]];
240 // The second bishop (camel) must be on a square of different color
241 let randIndexes_tmp = _.sample(_.range(5), 2).map(i => { return 2*i+1; });
242 let bishop2Pos = positions[randIndexes_tmp[0]];
243 let camel2Pos = positions[randIndexes_tmp[1]];
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244 for (let idx of randIndexes.concat(randIndexes_tmp)
245 .sort((a,b) => { return b-a; })) //largest indices first
246 {
dca02599 247 positions.splice(idx, 1);
92342261 248 }
a37076f1 249
dca02599 250 let randIndex = _.random(6);
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251 let knight1Pos = positions[randIndex];
252 positions.splice(randIndex, 1);
dca02599 253 randIndex = _.random(5);
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254 let knight2Pos = positions[randIndex];
255 positions.splice(randIndex, 1);
256
8a196305 257 randIndex = _.random(4);
dca02599 258 let queenPos = positions[randIndex];
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259 positions.splice(randIndex, 1);
260
92342261 261 // Random square for wildebeest
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262 randIndex = _.random(3);
263 let wildebeestPos = positions[randIndex];
264 positions.splice(randIndex, 1);
265
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266 let rook1Pos = positions[0];
267 let kingPos = positions[1];
268 let rook2Pos = positions[2];
269
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270 pieces[c][rook1Pos] = 'r';
271 pieces[c][knight1Pos] = 'n';
272 pieces[c][bishop1Pos] = 'b';
273 pieces[c][queenPos] = 'q';
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274 pieces[c][camel1Pos] = 'c';
275 pieces[c][camel2Pos] = 'c';
276 pieces[c][wildebeestPos] = 'w';
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277 pieces[c][kingPos] = 'k';
278 pieces[c][bishop2Pos] = 'b';
279 pieces[c][knight2Pos] = 'n';
280 pieces[c][rook2Pos] = 'r';
281 }
c794dbb8 282 return pieces["b"].join("") +
8a196305 283 "/ppppppppppp/11/11/11/11/11/11/PPPPPPPPPPP/" +
92342261 284 pieces["w"].join("").toUpperCase() +
2d7194bd 285 " w 1111 -";
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286 }
287}