A Bot to Play Tic Tac Toe

Tic-Tac-Toe is very familiar and one of the most popular games. Let us create this game by using the easyAI library in Python.

The following code is the Python code of this game:

Import the packages as shown:

from easyAI import TwoPlayersGame, AI_Player, Negamax

from easyAI.Player import Human_Player

Inherit the class from the TwoPlayerGame class to handle all operations of the game:

class TicTacToe_game(TwoPlayersGame):

def __init__(self, players):

Now, define the players and the player who is going to start the game:

self.players = players

self.nplayer = 1

Define the type of board:

self.board = [0] * 9

Now there are some certain things to define as follows:

Define possible moves:

def possible_moves(self):

return [x + 1 for x, y in enumerate(self.board) if y == 0]

Define the move of a player:

def make_move(self, move):

self.board[int(move) - 1] = self.nplayer

To boost AI, define when a player makes a move:

def umake_move(self, move):

self.board[int(move) - 1] = 0

Define the lose condition that an opponent have three in a line

def condition_for_lose(self):

possible_combinations = [[1,2,3], [4,5,6], [7,8,9],

[1,4,7], [2,5,8], [3,6,9], [1,5,9], [3,5,7]]

return any([all([(self.board[z-1] == self.nopponent)
for z in combination]) for combination in possible_combinations])

Define a check for the finish of game

def is_over(self):
return (self.possible_moves() == []) or self.condition_for_lose()

Show the current position of the players in the game

def show(self):
print('\n'+'\n'.join([' '.join([['.', 'O', 'X'][self.board[3*j + i]]
for i in range(3)]) for j in range(3)]))

Compute the scores.

def scoring(self):
return -100 if self.condition_for_lose() else 0

Define the main method to define the algorithm and start the game:

if __name__ == "__main__":
algo = Negamax(7)
TicTacToe_game([Human_Player(), AI_Player(algo)]).play()

You can see the following output and a simple play of this game:

. . .
. . .
. . .
Player 1 what do you play ? 1
Move #1: player 1 plays 1 :
O . .
. . .
. . .
Move #2: player 2 plays 5 :
O . .
. X .

. . .
Player 1 what do you play ? 3
Move #3: player 1 plays 3 :
O . O
. X .
. . .
Move #4: player 2 plays 2 :
O X O
. X .
. . .
Player 1 what do you play ? 4
Move #5: player 1 plays 4 :
O X O
O X .
. . .
Move #6: player 2 plays 8 :
O X O
O X .
. X .