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othello.py
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othello.py
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import numpy as np
class Othello(object):
def __init__(self):
self.reset_board()
def reset_board(self):
self.board = np.zeros((8, 8), dtype=np.int)
self.board[3, 3] = 1
self.board[3, 4] = -1
self.board[4, 3] = -1
self.board[4, 4] = 1
def play_move(self, x, y, side):
if x == -1 and y == -1:
return
self.board[x,y] = side
self.flip(x, y, side)
def game_over(self):
for i in range(8):
for j in range(8):
if self.board[i,j] == 0 and (self.valid_flip(i,j, -1) or self.valid_flip(i,j, 1)):
return False
return True
def get_winner(self):
t = np.sum(self.board)
if t > 0:
return 1
if t < 0:
return -1
return 0
def possible_moves(self, side):
moves = []
for i in range(8):
for j in range(8):
if self.board[i,j] == 0 and self.valid_flip(i,j, side):
moves.append((i, j))
return moves
def valid_flip(self, x, y, side):
for dx in range(-1, 2):
for dy in range(-1, 2):
if dy == 0 and dx == 0:
continue
if(self.valid_ray(x, y, side, dx, dy)):
return True
return False
def valid_ray(self, x, y, side, dx, dy):
tx = x + 2*dx
if tx < 0 or tx > 7:
return False
ty = y + 2*dy
if ty < 0 or ty > 7:
return False
if self.board[x+dx, y+dy] != -1*side:
return False
while self.board[tx, ty] != side:
if self.board[tx, ty] == 0:
return False
tx += dx
ty += dy
if tx < 0 or tx > 7:
return False
if ty < 0 or ty > 7:
return False
return True
def flip(self, x, y, side):
for dx in range(-1, 2):
for dy in range(-1, 2):
if dy == 0 and dx == 0:
continue
if(self.valid_ray(x, y, side, dx, dy)):
self.flip_ray(x, y, side, dx, dy)
def flip_ray(self, x, y, side, dx, dy):
tx = x + dx
ty = y + dy
while self.board[tx, ty] != side:
self.board[tx, ty] = side
tx += dx
ty += dy
def print_board(self):
print(" ", end="")
for i in range(8):
print("%2d" % (i) , end="")
print("\n ", end="")
for _ in range(16):
print("-", end="")
print("-")
for i in range(8):
print("%2d " % (i) , end="")
for j in range(8):
print("|" + Othello.piece_map(self.board[i,j]), end="")
print("|")
print(" ", end="")
for _ in range(16):
print("-", end="")
print("-")
@staticmethod
def piece_map(x):
return {
1: 'W',
-1: 'B',
0: ' ',
}[x]
@staticmethod
def move_id(move):
if move == (-1,-1):
return 64
return move[0]+move[1]*8
move_count = 65
def get_move(mid):
if mid == 64:
return (-1, -1)
x = mid%8
y = mid//8
return (x, y)
@staticmethod
def state_id(board):
x = np.add(board, 1).flatten()
id = 0
mult = 1
for t in x:
id += mult*int(t)
mult *= 3
return id