-
Notifications
You must be signed in to change notification settings - Fork 2
/
Copy pathChessEngine -naive algorithm.py
238 lines (214 loc) · 10.4 KB
/
ChessEngine -naive algorithm.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
class GameState():
def __init__(self):
self.board = [
["bR", "bN", "bB", "bQ", "bK", "bB", "bN", "bR"],
["bp", "bp", "bp", "bp", "bp", "bp", "bp", "bp"],
["--", "--", "--", "--", "--", "--", "--", "--"],
["--", "--", "--", "--", "--", "--", "--", "--"],
["--", "--", "--", "--", "--", "--", "--", "--"],
["--", "--", "--", "--", "--", "--", "--", "--"],
["wp", "wp", "wp", "wp", "wp", "wp", "wp", "wp"],
["wR", "wN", "wB", "wQ", "wK", "wB", "wN", "wR"]
]
self.moveFunctions = {'p': self.getPawnMoves, 'R': self.getRookMoves, 'N': self.getKnightMoves,
'B': self.getBishopMoves, 'Q': self.getQueenMoves, 'K': self.getKingMoves,}
self.whiteToMove = True
self.moveLog = []
self.whiteKingLocate = (7, 4)
self.blackKingLocate = (0, 4)
self.checkMate = False
self.staleMate = False
self.enpassantPossible = ()
def makeMove(self, move):
self.board[move.startRow][move.startCol] = "--"
self.board[move.endRow][move.endCol] = move.pieceMoved
self.moveLog.append(move)
self.whiteToMove = not self.whiteToMove
if move.pieceMoved == "wK":
self.whiteKingLocate = (move.endRow, move.endCol)
if move.pieceMoved == "bK":
self.blackKingLocate = (move.endRow, move.endCol)
# Enpassant Move
if move.isEnpassantMove:
print("HERE")
self.board[move.startRow][move.endCol] = "--" # capturing the pawn
# EnpassantPossible update
if move.pieceMoved[1] == 'p' and (abs(move.startRow - move.endRow) == 2): # only 2 squares pawn move
self.enpassantPossible = ((move.startRow + move.endRow) // 2, move.endCol)
else:
self.enpassantPossible = () # not en passant move
def undoMove(self):
if len(self.moveLog) != 0:
move = self.moveLog.pop()
self.board[move.startRow][move.startCol] = move.pieceMoved
self.board[move.endRow][move.endCol] = move.pieceCaptured
self.whiteToMove = not self.whiteToMove
if move.pieceMoved == "wK":
self.whiteKingLocate = (move.startRow, move.startCol)
if move.pieceMoved == "bK":
self.blackKingLocate = (move.startRow, move.startCol)
if move.isEnpassantMove:
self.board[move.endRow][move.endCol] = "--"
self.board[move.startRow][move.endCol] = move.pieceCaptured
self.enpassantPossible = (move.endRow, move.endCol)
if move.pieceMoved[1] == 'p' and abs(move.startRow - move.endRow) == 2:
self.enpassantPossible = ()
def getValidMoves(self):
tempEnpassantPossible = self.enpassantPossible
moves = self.getAllPossibleMoves()
for i in range(len(moves)-1, -1, -1):
self.makeMove(moves[i])
self.whiteToMove = not self.whiteToMove
if self.inCheck():
moves.remove(moves[i])
self.undoMove()
self.whiteToMove = not self.whiteToMove
if len(moves) == 0:
if self.inCheck():
self.checkMate = True
print("checkMate")
else:
self.staleMate = True
print("staleMate")
else:
self.checkMate = False
self.staleMate = False
self.enpassantPossible = tempEnpassantPossible
return moves
def inCheck(self):
if self.whiteToMove:
return self.sqUnderAttack(self.whiteKingLocate[0], self.whiteKingLocate[1])
else:
return self.sqUnderAttack(self.blackKingLocate[0], self.blackKingLocate[1])
def sqUnderAttack(self, r, c):
self.whiteToMove = not self.whiteToMove
oppMoves = self.getAllPossibleMoves()
self.whiteToMove = not self.whiteToMove
for move in oppMoves:
if move.endRow == r and move.endCol == c:
return True
return False
def getAllPossibleMoves(self):
moves = []
for r in range(len(self.board)):
for c in range(len(self.board[r])):
turn = self.board[r][c][0]
if (turn == 'w' and self.whiteToMove) or (turn == 'b' and not self.whiteToMove):
piece = self.board[r][c][1]
self.moveFunctions[piece](r, c, moves)
return moves
def getPawnMoves(self, r, c, moves):
if self.whiteToMove:
if self.board[r-1][c] == "--":
moves.append(Move((r, c), (r-1, c), self.board))
if self.board[r-2][c] == "--" and r == 6:
moves.append(Move((r, c), (r-2, c), self.board))
if c-1 >= 0:
if self.board[r-1][c-1][0] == "b":
moves.append(Move((r, c), (r-1, c-1), self.board))
elif (r - 1, c - 1) == self.enpassantPossible:
moves.append(Move((r, c), (r - 1, c - 1), self.board, isEnpassantMove=True))
if c+1 <= 7:
if self.board[r-1][c+1][0] == "b":
moves.append(Move((r, c), (r-1, c+1), self.board))
elif (r - 1, c + 1) == self.enpassantPossible:
moves.append(Move((r, c), (r - 1, c + 1), self.board, isEnpassantMove=True))
else:
if self.board[r+1][c] == "--":
moves.append(Move((r, c), (r+1, c), self.board))
if self.board[r+2][c] == "--" and r == 1:
moves.append(Move((r, c), (r+2, c), self.board))
if c-1 >= 0:
if self.board[r+1][c-1][0] == "w":
moves.append(Move((r, c), (r+1, c-1), self.board))
elif (r + 1, c - 1) == self.enpassantPossible:
moves.append(Move((r, c), (r + 1, c - 1), self.board, isEnpassantMove=True))
if c+1 <= 7:
if self.board[r+1][c+1][0] == "w":
moves.append(Move((r, c), (r+1, c+1), self.board))
elif (r + 1, c + 1) == self.enpassantPossible:
moves.append(Move((r, c), (r + 1, c + 1), self.board, isEnpassantMove=True))
def getRookMoves(self, r, c, moves):
straightDirections = ((-1, 0), (1, 0), (0, -1), (0, 1))
enemyColor = 'b' if self.whiteToMove else 'w'
for d in straightDirections:
for i in range(1, 8):
endRow = r + d[0] * i
endCol = c + d[1] * i
if (0 <= endRow < 8) and (0 <= endCol < 8):
endPiece = self.board[endRow][endCol]
if endPiece == "--":
moves.append(Move((r, c), (endRow, endCol), self.board))
elif endPiece[0] == enemyColor:
moves.append(Move((r, c), (endRow, endCol), self.board))
break
else:
break
else:
break
def getKnightMoves(self, r, c, moves):
knightDirections = ((-2, -1), (-1, -2), (1, -2), (2, -1), (2, 1), (1, 2), (-1, 2), (-2, 1))
allyColor = 'w' if self.whiteToMove else 'b'
for d in knightDirections:
endRow = r + d[0]
endCol = c + d[1]
if (0 <= endRow < 8) and (0 <= endCol < 8):
endPiece = self.board[endRow][endCol]
if endPiece[0] != allyColor:
moves.append(Move((r, c), (endRow, endCol), self.board))
def getBishopMoves(self, r, c, moves):
diagonalDirections = ((-1, -1), (1, 1), (1, -1), (-1, 1))
enemyColor = 'b' if self.whiteToMove else 'w'
for d in diagonalDirections:
for i in range(1, 8):
endRow = r + d[0] * i
endCol = c + d[1] * i
if (0 <= endRow < 8) and (0 <= endCol < 8):
endPiece = self.board[endRow][endCol]
if endPiece == "--":
moves.append(Move((r, c), (endRow, endCol), self.board))
elif endPiece[0] == enemyColor:
moves.append(Move((r, c), (endRow, endCol), self.board))
break
else:
break
else:
break
def getQueenMoves(self, r, c, moves):
self.getRookMoves(r, c, moves)
self.getBishopMoves(r, c, moves)
def getKingMoves(self, r, c, moves):
kingDirections = ((-1, 0), (1, 0), (0, -1), (0, 1), (-1, -1), (1, 1), (1, -1), (-1, 1))
allyColor = 'w' if self.whiteToMove else 'b'
for i in range(8):
endRow = r + kingDirections[i][0]
endCol = c + kingDirections[i][1]
if (0 <= endRow < 8) and (0 <= endCol < 8):
endPiece = self.board[endRow][endCol]
if endPiece[0] != allyColor:
moves.append(Move((r, c), (endRow, endCol), self.board))
class Move():
ranksToRows = {"1": 7, "2": 6, "3": 5, "4": 4, "5": 3, "6": 2, "7": 1, "8": 0}
rowsToRanks = {v: k for k, v in ranksToRows.items()}
filesToCols = {"a": 0, "b": 1, "c": 2, "d": 3, "e": 4, "f": 5, "g": 6, "h": 7}
colsToFiles = {v: k for k, v in filesToCols.items()}
def __init__(self, startSq, endSq, board, isEnpassantMove = False):
self.startRow = startSq[0]
self.startCol = startSq[1]
self.endRow = endSq[0]
self.endCol = endSq[1]
self.pieceMoved = board[self.startRow][self.startCol]
self.pieceCaptured = board[self.endRow][self.endCol]
self.isEnpassantMove = isEnpassantMove
if self.isEnpassantMove:
self.pieceCaptured = "wp" if self.pieceMoved == "bp" else "bp"
self.moveID = self.startCol * 1000 + self.startRow * 100 + self.endCol * 10 + self.endRow
def __eq__(self, other):
if isinstance(other, Move):
return self.moveID == other.moveID
else:
return False
def getChessNotation(self):
return self.getFileRank(self.startRow, self.startCol) + "-" + self.getFileRank(self.endRow, self.endCol)
def getFileRank(self, row, col):
return self.colsToFiles[col] + self.rowsToRanks[row]