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1d184b4c BA |
1 | class CheckeredRules extends ChessRules |
2 | { | |
1d184b4c BA |
3 | static getPpath(b) |
4 | { | |
5 | return b[0]=='c' ? "Checkered/"+b : b; | |
6 | } | |
7 | static board2fen(b) | |
8 | { | |
9 | const checkered_codes = { | |
10 | 'p': 's', | |
11 | 'q': 't', | |
12 | 'r': 'u', | |
13 | 'b': 'c', | |
14 | 'n': 'o', | |
15 | }; | |
16 | if (b[0]=="c") | |
17 | return checkered_codes[b[1]]; | |
18 | return ChessRules.board2fen(b); | |
19 | } | |
20 | static fen2board(f) | |
21 | { | |
22 | const checkered_pieces = { | |
23 | 's': 'p', | |
24 | 't': 'q', | |
25 | 'u': 'r', | |
26 | 'c': 'b', | |
27 | 'o': 'n', | |
28 | }; | |
29 | if (Object.keys(checkered_pieces).includes(f)) | |
30 | return 'c'+checkered_pieces[f]; | |
31 | return ChessRules.fen2board(f); | |
32 | } | |
33 | ||
2526c041 | 34 | setFlags(fen) |
1d184b4c | 35 | { |
2526c041 BA |
36 | super.setFlags(fen); //castleFlags |
37 | this.pawnFlags = | |
38 | { | |
39 | "w": new Array(8), //pawns can move 2 squares? | |
40 | "b": new Array(8) | |
41 | }; | |
42 | const flags = fen.split(" ")[1].substr(4); //skip first 4 digits, for castle | |
1d184b4c BA |
43 | for (let c of ['w','b']) |
44 | { | |
45 | for (let i=0; i<8; i++) | |
2526c041 | 46 | this.pawnFlags[c][i] = (flags.charAt((c=='w'?0:8)+i) == '1'); |
1d184b4c | 47 | } |
1d184b4c BA |
48 | } |
49 | ||
2526c041 BA |
50 | // Aggregates flags into one object |
51 | get flags() { | |
52 | return [this.castleFlags, this.pawnFlags]; | |
1d184b4c BA |
53 | } |
54 | ||
2526c041 BA |
55 | // Reverse operation |
56 | parseFlags(flags) | |
1d184b4c | 57 | { |
2526c041 BA |
58 | this.castleFlags = flags[0]; |
59 | this.pawnFlags = flags[1]; | |
1d184b4c BA |
60 | } |
61 | ||
2526c041 | 62 | canTake([x1,y1], [x2,y2]) |
1d184b4c | 63 | { |
2526c041 BA |
64 | const color1 = this.getColor(x1,y1); |
65 | const color2 = this.getColor(x2,y2); | |
66 | // Checkered aren't captured | |
67 | return color1 != color2 && color2 != 'c' && (color1 != 'c' || color2 != this.turn); | |
1d184b4c BA |
68 | } |
69 | ||
2526c041 BA |
70 | // Post-processing: apply "checkerization" of standard moves |
71 | getPotentialMovesFrom([x,y]) | |
1d184b4c | 72 | { |
2526c041 | 73 | let standardMoves = super.getPotentialMovesFrom([x,y]); |
aea1443e | 74 | const lastRank = this.turn == "w" ? 0 : 7; |
2526c041 BA |
75 | if (this.getPiece(x,y) == VariantRules.KING) |
76 | return standardMoves; //king has to be treated differently (for castles) | |
1d184b4c | 77 | let moves = []; |
2526c041 BA |
78 | standardMoves.forEach(m => { |
79 | if (m.vanish[0].p == VariantRules.PAWN && Math.abs(m.end.x-m.start.x)==2 | |
80 | && !this.pawnFlags[this.turn][m.start.y]) | |
1d184b4c | 81 | { |
2526c041 | 82 | return; //skip forbidden 2-squares jumps |
1d184b4c | 83 | } |
2526c041 BA |
84 | if (m.vanish.length == 1) |
85 | moves.push(m); //no capture | |
86 | else | |
1d184b4c | 87 | { |
2526c041 BA |
88 | // A capture occured (m.vanish.length == 2) |
89 | m.appear[0].c = "c"; | |
aea1443e | 90 | moves.push(m); |
68f5ccc8 | 91 | if (m.appear[0].p != m.vanish[1].p //avoid promotions (already treated): |
aea1443e | 92 | && (m.vanish[0].p != VariantRules.PAWN || m.end.x != lastRank)) |
1d184b4c | 93 | { |
2526c041 BA |
94 | // Add transformation into captured piece |
95 | let m2 = JSON.parse(JSON.stringify(m)); | |
aea1443e | 96 | m2.appear[0].p = m.vanish[1].p; |
2526c041 | 97 | moves.push(m2); |
1d184b4c BA |
98 | } |
99 | } | |
2526c041 | 100 | }); |
1d184b4c BA |
101 | return moves; |
102 | } | |
103 | ||
46302e64 | 104 | canIplay(side, [x,y]) |
1d184b4c | 105 | { |
46302e64 BA |
106 | return ((side=='w' && this.moves.length%2==0) || (side=='b' && this.moves.length%2==1)) |
107 | && [side,'c'].includes(this.getColor(x,y)); | |
1d184b4c BA |
108 | } |
109 | ||
110 | // Does m2 un-do m1 ? (to disallow undoing checkered moves) | |
111 | oppositeMoves(m1, m2) | |
112 | { | |
113 | return m1.appear.length == 1 && m2.appear.length == 1 | |
114 | && m1.vanish.length == 1 && m2.vanish.length == 1 | |
1d184b4c BA |
115 | && m1.start.x == m2.end.x && m1.end.x == m2.start.x |
116 | && m1.start.y == m2.end.y && m1.end.y == m2.start.y | |
117 | && m1.appear[0].c == m2.vanish[0].c && m1.appear[0].p == m2.vanish[0].p | |
118 | && m1.vanish[0].c == m2.appear[0].c && m1.vanish[0].p == m2.appear[0].p; | |
119 | } | |
120 | ||
121 | filterValid(moves) | |
122 | { | |
123 | if (moves.length == 0) | |
124 | return []; | |
46302e64 | 125 | const color = this.turn; |
1d184b4c BA |
126 | return moves.filter(m => { |
127 | const L = this.moves.length; | |
128 | if (L > 0 && this.oppositeMoves(this.moves[L-1], m)) | |
129 | return false; | |
46302e64 | 130 | return !this.underCheck(m); |
1d184b4c BA |
131 | }); |
132 | } | |
133 | ||
46302e64 BA |
134 | isAttackedByPawn([x,y], colors) |
135 | { | |
136 | for (let c of colors) | |
137 | { | |
138 | const color = (c=="c" ? this.turn : c); | |
139 | let pawnShift = (color=="w" ? 1 : -1); | |
140 | if (x+pawnShift>=0 && x+pawnShift<8) | |
141 | { | |
142 | for (let i of [-1,1]) | |
143 | { | |
144 | if (y+i>=0 && y+i<8 && this.getPiece(x+pawnShift,y+i)==VariantRules.PAWN | |
145 | && this.getColor(x+pawnShift,y+i)==c) | |
146 | { | |
147 | return true; | |
148 | } | |
149 | } | |
150 | } | |
151 | } | |
152 | return false; | |
153 | } | |
1d184b4c | 154 | |
46302e64 | 155 | underCheck(move) |
1d184b4c | 156 | { |
46302e64 | 157 | const color = this.turn; |
1d184b4c | 158 | this.play(move); |
46302e64 | 159 | let res = this.isAttacked(this.kingPos[color], [this.getOppCol(color),'c']); |
1d184b4c BA |
160 | this.undo(move); |
161 | return res; | |
162 | } | |
163 | ||
46302e64 | 164 | getCheckSquares(move) |
bd6ff57c BA |
165 | { |
166 | this.play(move); | |
46302e64 | 167 | const color = this.turn; |
cd4cad04 | 168 | this.moves.push(move); //artifically change turn, for checkered pawns (TODO) |
46302e64 | 169 | const kingAttacked = this.isAttacked(this.kingPos[color], [this.getOppCol(color),'c']); |
bd6ff57c | 170 | let res = kingAttacked |
46302e64 | 171 | ? [ JSON.parse(JSON.stringify(this.kingPos[color])) ] //need to duplicate! |
bd6ff57c | 172 | : [ ]; |
cd4cad04 | 173 | this.moves.pop(); |
bd6ff57c BA |
174 | this.undo(move); |
175 | return res; | |
176 | } | |
177 | ||
1d184b4c BA |
178 | updateVariables(move) |
179 | { | |
1d184b4c | 180 | const c = this.getColor(move.start.x,move.start.y); |
1d184b4c | 181 | if (c != 'c') //checkered not concerned by castle flags |
2526c041 | 182 | super.updateVariables(move); |
1d184b4c BA |
183 | |
184 | // Does it turn off a 2-squares pawn flag? | |
185 | const secondRank = [1,6]; | |
186 | if (secondRank.includes(move.start.x) && move.vanish[0].p == VariantRules.PAWN) | |
2526c041 | 187 | this.pawnFlags[move.start.x==6 ? "w" : "b"][move.start.y] = false; |
1d184b4c BA |
188 | } |
189 | ||
46302e64 | 190 | checkGameEnd() |
1d184b4c | 191 | { |
46302e64 | 192 | const color = this.turn; |
e2b216fe BA |
193 | this.moves.length++; //artifically change turn, for checkered pawns (TODO) |
194 | const res = this.isAttacked(this.kingPos[color], [this.getOppCol(color),'c']) | |
195 | ? (color == "w" ? "0-1" : "1-0") | |
196 | : "1/2"; | |
197 | this.moves.length--; | |
198 | return res; | |
1d184b4c BA |
199 | } |
200 | ||
201 | evalPosition() | |
202 | { | |
203 | const [sizeX,sizeY] = VariantRules.size; | |
204 | let evaluation = 0; | |
205 | //Just count material for now, considering checkered neutral (...) | |
206 | for (let i=0; i<sizeX; i++) | |
207 | { | |
208 | for (let j=0; j<sizeY; j++) | |
209 | { | |
210 | if (this.board[i][j] != VariantRules.EMPTY) | |
211 | { | |
212 | const sqColor = this.getColor(i,j); | |
213 | const sign = sqColor == "w" ? 1 : (sqColor=="b" ? -1 : 0); | |
214 | evaluation += sign * VariantRules.VALUES[this.getPiece(i,j)]; | |
215 | } | |
216 | } | |
217 | } | |
218 | return evaluation; | |
219 | } | |
220 | ||
221 | static GenRandInitFen() | |
222 | { | |
f3802fcd | 223 | return ChessRules.GenRandInitFen() + "1111111111111111"; //add 16 pawns flags |
1d184b4c BA |
224 | } |
225 | ||
226 | getFlagsFen() | |
227 | { | |
2526c041 | 228 | let fen = super.getFlagsFen(); |
1d184b4c BA |
229 | // Add pawns flags |
230 | for (let c of ['w','b']) | |
231 | { | |
232 | for (let i=0; i<8; i++) | |
2526c041 | 233 | fen += this.pawnFlags[c][i] ? '1' : '0'; |
1d184b4c BA |
234 | } |
235 | return fen; | |
236 | } | |
237 | ||
238 | getNotation(move) | |
239 | { | |
240 | if (move.appear.length == 2) | |
241 | { | |
242 | // Castle | |
243 | if (move.end.y < move.start.y) | |
244 | return "0-0-0"; | |
245 | else | |
246 | return "0-0"; | |
247 | } | |
248 | ||
249 | // Translate final square | |
250 | let finalSquare = | |
251 | String.fromCharCode(97 + move.end.y) + (VariantRules.size[0]-move.end.x); | |
252 | ||
253 | let piece = this.getPiece(move.start.x, move.start.y); | |
254 | if (piece == VariantRules.PAWN) | |
255 | { | |
256 | // Pawn move | |
257 | let notation = ""; | |
258 | if (move.vanish.length > 1) | |
259 | { | |
260 | // Capture | |
261 | let startColumn = String.fromCharCode(97 + move.start.y); | |
262 | notation = startColumn + "x" + finalSquare + "=" + move.appear[0].p.toUpperCase(); | |
263 | } | |
264 | else //no capture | |
265 | notation = finalSquare; | |
266 | if (move.appear.length > 0 && piece != move.appear[0].p) //promotion | |
267 | notation += "=" + move.appear[0].p.toUpperCase(); | |
268 | return notation; | |
269 | } | |
270 | ||
271 | else | |
272 | { | |
273 | // Piece movement | |
274 | return piece.toUpperCase() + (move.vanish.length > 1 ? "x" : "") + finalSquare | |
275 | + (move.vanish.length > 1 ? "=" + move.appear[0].p.toUpperCase() : ""); | |
276 | } | |
277 | } | |
278 | } |