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ChessEngine.py
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ChessEngine.py
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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.whiteKingLocation = (7, 4)
self.blackKingLocation = (0, 4)
self.checkMate = False
self.staleMate = False
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.whiteKingLocation = (move.endRow, move.endCol)
elif move.pieceMoved == "bK":
self.blackKingLocation = (move.endRow, move.endCol)
if move.isPawnPromotion:
self.board[move.endRow][move.endCol] = move.pieceMoved[0] + "Q"
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.whiteKingLocation = (move.startRow, move.startCol)
if move.pieceMoved == "bK":
self.blackKingLocation = (move.startRow, move.startCol)
"""
All move considering checks
"""
def getValidMoves(self):
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.whiteToMove = not self.whiteToMove
self.undoMove()
if len(moves) == 0:
if self.inCheck():
self.checkMate = True
else:
self.staleMate = True
else:
self.checkMate = False
self.staleMate = False
return moves
def inCheck(self):
if self.whiteToMove:
return self.squareUnderAttack(self.whiteKingLocation[0], self.whiteKingLocation[1])
else:
return self.squareUnderAttack(self.blackKingLocation[0], self.blackKingLocation[1])
def squareUnderAttack(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
"""
All move without considering checks
"""
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] # b or w based on turn
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 r == 6 and self.board[r-2][c] == "--":
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))
if c+1 <= 7:
if self.board[r-1][c+1][0] == 'b':
moves.append(Move((r, c),(r-1, c+1), self.board))
else:
if self.board[r+1][c] == "--":
moves.append(Move((r, c),(r+1, c), self.board))
if r == 1 and self.board[r+2][c] == "--":
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))
if c+1 <= 7:
if self.board[r+1][c+1][0] == 'w':
moves.append(Move((r, c),(r+1, c+1), self.board))
def getRookMoves(self, r, c, moves):
directions = ((-1, 0), (0, -1), (1, 0), (0, 1))
enemyColor = "b" if self.whiteToMove else "w"
for d in directions:
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):
knightMoves = ((-2, -1), (-2, 1), (-1, -2), (-1, 2), (1, -2), (1, 2), (2, -1), (2,1))
allyColor = "w" if self.whiteToMove else "b"
for m in knightMoves:
endRow = r + m[0]
endCol = c + m[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):
directions = ((-1, -1), (-1, 1), (1, -1), (1, 1))
enemyColor = "b" if self.whiteToMove else "w"
for d in directions:
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):
kingMoves = ((-1, -1), (-1, 0), (-1, 1), (0, -1), (0, 1), (1, -1), (1, 0), (1,1) )
allyColor = "w" if self.whiteToMove else "b"
for i in range(8):
endRow = r + kingMoves[i][0]
endCol = c + kingMoves[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():
ranksToRow = {"1": 7, "2": 6, "3": 5, "4": 4,
"5": 3, "6": 2, "7": 1, "8": 0}
rowsToRanks = {v: k for k, v in ranksToRow.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):
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.isPawnPromotion = False
if (self.pieceMoved == 'wp' and self.endRow == 0) or (self.pieceMoved == 'bp' and self.endRow == 7):
self.isPawnPromotion = True
self.moveID = self.startRow * 1000 + self.startCol * 100 + self.endRow * 10 + self.endCol
def __eq__(self, other):
if isinstance(other, Move):
return self.moveID == other.moveID
return False
def getChessNotation(self):
return self.getRankFile(self.startRow, self.startCol) + self.getRankFile(self.endRow, self.endCol)
def getRankFile(self, r, c):
return self.colsToFiles[c] + self.rowsToRanks[r]