Commit | Line | Data |
---|---|---|
26c1e3bd | 1 | class LosersRules extends ChessRules |
a6abf094 | 2 | { |
2d7194bd | 3 | static get HasFlags() { return false; } |
7931e479 | 4 | |
a6abf094 BA |
5 | getPotentialPawnMoves([x,y]) |
6 | { | |
7 | let moves = super.getPotentialPawnMoves([x,y]); | |
8 | ||
9 | // Complete with promotion(s) into king, if possible | |
10 | const color = this.turn; | |
a6abf094 | 11 | const shift = (color == "w" ? -1 : 1); |
0b7d99ec | 12 | const lastRank = (color == "w" ? 0 : V.size.x-1); |
a6abf094 BA |
13 | if (x+shift == lastRank) |
14 | { | |
a6abf094 BA |
15 | // Normal move |
16 | if (this.board[x+shift][y] == V.EMPTY) | |
92342261 | 17 | moves.push(this.getBasicMove([x,y], [x+shift,y], {c:color,p:V.KING})); |
a6abf094 | 18 | // Captures |
92342261 BA |
19 | if (y>0 && this.canTake([x,y], [x+shift,y-1]) |
20 | && this.board[x+shift][y-1] != V.EMPTY) | |
21 | { | |
22 | moves.push(this.getBasicMove([x,y], [x+shift,y-1], {c:color,p:V.KING})); | |
23 | } | |
0b7d99ec | 24 | if (y<V.size.y-1 && this.canTake([x,y], [x+shift,y+1]) |
92342261 BA |
25 | && this.board[x+shift][y+1] != V.EMPTY) |
26 | { | |
27 | moves.push(this.getBasicMove([x,y], [x+shift,y+1], {c:color,p:V.KING})); | |
28 | } | |
a6abf094 BA |
29 | } |
30 | ||
31 | return moves; | |
32 | } | |
33 | ||
34 | getPotentialKingMoves(sq) | |
35 | { | |
2d7194bd | 36 | // No castle: |
a6abf094 BA |
37 | return this.getSlideNJumpMoves(sq, |
38 | V.steps[V.ROOK].concat(V.steps[V.BISHOP]), "oneStep"); | |
39 | } | |
40 | ||
41 | // Stop at the first capture found (if any) | |
42 | atLeastOneCapture() | |
43 | { | |
44 | const color = this.turn; | |
26b8e4f7 | 45 | const oppCol = V.GetOppCol(color); |
0b7d99ec | 46 | for (let i=0; i<V.size.x; i++) |
a6abf094 | 47 | { |
0b7d99ec | 48 | for (let j=0; j<V.size.y; j++) |
a6abf094 | 49 | { |
0b7d99ec | 50 | if (this.board[i][j] != V.EMPTY && this.getColor(i,j) != oppCol) |
a6abf094 BA |
51 | { |
52 | const moves = this.getPotentialMovesFrom([i,j]); | |
53 | if (moves.length > 0) | |
54 | { | |
55 | for (let k=0; k<moves.length; k++) | |
56 | { | |
57 | if (moves[k].vanish.length==2 && this.filterValid([moves[k]]).length > 0) | |
58 | return true; | |
59 | } | |
60 | } | |
61 | } | |
62 | } | |
63 | } | |
64 | return false; | |
65 | } | |
66 | ||
67 | // Trim all non-capturing moves | |
68 | static KeepCaptures(moves) | |
69 | { | |
70 | return moves.filter(m => { return m.vanish.length == 2; }); | |
71 | } | |
72 | ||
73 | getPossibleMovesFrom(sq) | |
74 | { | |
75 | let moves = this.filterValid( this.getPotentialMovesFrom(sq) ); | |
76 | // This is called from interface: we need to know if a capture is possible | |
77 | if (this.atLeastOneCapture()) | |
0b7d99ec | 78 | moves = V.KeepCaptures(moves); |
a6abf094 BA |
79 | return moves; |
80 | } | |
81 | ||
82 | getAllValidMoves() | |
83 | { | |
84 | let moves = super.getAllValidMoves(); | |
85 | if (moves.some(m => { return m.vanish.length == 2; })) | |
0b7d99ec | 86 | moves = V.KeepCaptures(moves); |
a6abf094 BA |
87 | return moves; |
88 | } | |
89 | ||
f6dbe8e3 | 90 | underCheck(color) |
a6abf094 BA |
91 | { |
92 | return false; //No notion of check | |
93 | } | |
94 | ||
95 | getCheckSquares(move) | |
96 | { | |
97 | return []; | |
98 | } | |
99 | ||
388e4c40 | 100 | // No variables update because no royal king + no castling |
6752407b BA |
101 | updateVariables(move) { } |
102 | unupdateVariables(move) { } | |
a6abf094 BA |
103 | |
104 | checkGameEnd() | |
105 | { | |
106 | // No valid move: you win! | |
107 | return this.turn == "w" ? "1-0" : "0-1"; | |
108 | } | |
109 | ||
2d7194bd BA |
110 | static get VALUES() |
111 | { | |
112 | // Experimental... | |
a6abf094 BA |
113 | return { |
114 | 'p': 1, | |
115 | 'r': 7, | |
116 | 'n': 3, | |
117 | 'b': 3, | |
118 | 'q': 5, | |
119 | 'k': 5 | |
120 | }; | |
121 | } | |
122 | ||
123 | static get SEARCH_DEPTH() { return 4; } | |
124 | ||
125 | evalPosition() | |
126 | { | |
127 | return - super.evalPosition(); //better with less material | |
128 | } | |
2eef6db6 BA |
129 | |
130 | static GenRandInitFen() | |
131 | { | |
132 | let pieces = { "w": new Array(8), "b": new Array(8) }; | |
133 | // Shuffle pieces on first and last rank | |
134 | for (let c of ["w","b"]) | |
135 | { | |
8d61fc4a | 136 | let positions = range(8); |
2eef6db6 BA |
137 | |
138 | // Get random squares for bishops | |
8d61fc4a | 139 | let randIndex = 2 * random(4); |
2eef6db6 BA |
140 | let bishop1Pos = positions[randIndex]; |
141 | // The second bishop must be on a square of different color | |
8d61fc4a | 142 | let randIndex_tmp = 2 * random(4) + 1; |
2eef6db6 BA |
143 | let bishop2Pos = positions[randIndex_tmp]; |
144 | // Remove chosen squares | |
145 | positions.splice(Math.max(randIndex,randIndex_tmp), 1); | |
146 | positions.splice(Math.min(randIndex,randIndex_tmp), 1); | |
147 | ||
148 | // Get random squares for knights | |
8d61fc4a | 149 | randIndex = random(6); |
2eef6db6 BA |
150 | let knight1Pos = positions[randIndex]; |
151 | positions.splice(randIndex, 1); | |
8d61fc4a | 152 | randIndex = random(5); |
2eef6db6 BA |
153 | let knight2Pos = positions[randIndex]; |
154 | positions.splice(randIndex, 1); | |
155 | ||
156 | // Get random square for queen | |
8d61fc4a | 157 | randIndex = random(4); |
2eef6db6 BA |
158 | let queenPos = positions[randIndex]; |
159 | positions.splice(randIndex, 1); | |
160 | ||
161 | // Random square for king (no castle) | |
8d61fc4a | 162 | randIndex = random(3); |
2eef6db6 BA |
163 | let kingPos = positions[randIndex]; |
164 | positions.splice(randIndex, 1); | |
165 | ||
166 | // Rooks positions are now fixed | |
167 | let rook1Pos = positions[0]; | |
168 | let rook2Pos = positions[1]; | |
169 | ||
170 | // Finally put the shuffled pieces in the board array | |
171 | pieces[c][rook1Pos] = 'r'; | |
172 | pieces[c][knight1Pos] = 'n'; | |
173 | pieces[c][bishop1Pos] = 'b'; | |
174 | pieces[c][queenPos] = 'q'; | |
175 | pieces[c][kingPos] = 'k'; | |
176 | pieces[c][bishop2Pos] = 'b'; | |
177 | pieces[c][knight2Pos] = 'n'; | |
178 | pieces[c][rook2Pos] = 'r'; | |
179 | } | |
180 | return pieces["b"].join("") + | |
181 | "/pppppppp/8/8/8/8/PPPPPPPP/" + | |
182 | pieces["w"].join("").toUpperCase() + | |
2d7194bd | 183 | " w -"; //no en-passant |
2eef6db6 | 184 | } |
a6abf094 | 185 | } |