I was trying to make chess playing algorithm that "bruteforces" possible options and choosing the best.
To do this, I wrote class, which represents board situation on board(showed the parts that used in bad code).
class Chess:
def __init__(self):
#Here is the board 2D array - enemy is downside.
self.board = [[ROOK, KNIGHT, BISHOP, QUEEN, KING, BISHOP, KNIGHT, ROOK], [PAWN for i in range(8)], [EMPTY for i in range(8)], [EMPTY for i in range(8)], [EMPTY for i in range(8)], [EMPTY for i in range(8)], [ENEMYPAWN for i in range(8)], [ENEMYROOK, ENEMYKNIGHT, ENEMYBISHOP, ENEMYKING, ENEMYQUEEN, ENEMYBISHOP, ENEMYKNIGHT, ENEMYROOK]]
def WriteBoard(self):
WriteBoard(self.board)
def Moove(self, x1, y1, x2, y2):
if x1 >= 8 or x1 < 0 or x2 >= 8 or x2 < 0 or y1 >= 8 or y1 < 0 or y2 >= 8 or y2 < 0:
raise IndexError("Parameter is not correct.")
return
#WARNING: Not checking if moove correct.
self.board[y2][x2] = self.board[y1][x1]
self.board[y1][x1] = EMPTY
Where:
EMPTY = 0
PAWN = 2
ROOK = 17
KNIGHT = 10
BISHOP = 14
QUEEN = 45
KING = 60
ENEMYPAWN = -2
ENEMYROOK = -17
ENEMYKNIGHT = -10
ENEMYBISHOP = -14
ENEMYQUEEN = -45
ENEMYKING = -60
...Next part is function that returns possible moves getting Chess variable and x, y as parameters:
def PossibleMooves(chessBoard, x, y):
possibleMooves = []
target = chessBoard.board[y][x]
if target == EMPTY:
return possibleMooves
helpVar = chessBoard
if target == PAWN:
try:
if helpVar.board[y + 1][x] == EMPTY:
helpVar.Moove(x, y, x, y + 1)
possibleMooves += [res]
index += 1
helpVar = chessBoard
except IndexError as e:
... #print(e)
elif target == ROOK:
...
... #And so on...
return possibleMooves
Please note that try...except statement helps to establish correctness of move(index like [y + 1][x] can not exist)
But the problem is:
Variable chessBoard changing together with helpVar, and variable that were given to function.
You can check it with this code:
chess = Chess()
print(chess.board[1][1])
results = PossibleMooves(chess, 1, 1)
print(chess.board[1][1])
Output should be:
2
2
But its:
2
0
