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Update connect4_with_ai.py #3

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Update connect4_with_ai.py #3

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8 changes: 6 additions & 2 deletions connect4_with_ai.py
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Original file line number Diff line number Diff line change
Expand Up @@ -135,18 +135,22 @@ def minimax(board, depth, alpha, beta, maximizingPlayer):
return (None, score_position(board, AI_PIECE))
if maximizingPlayer:
value = -math.inf
column = random.choice(valid_locations)
best_col = []
for col in valid_locations:
row = get_next_open_row(board, col)
b_copy = board.copy()
drop_piece(b_copy, row, col, AI_PIECE)
new_score = minimax(b_copy, depth-1, alpha, beta, False)[1]
if new_score > value:
value = new_score
column = col
best_col = [col]
elif new_score == value:
best_col.append(col)
alpha = max(alpha, value)
if alpha >= beta:
break

column = random.choice(best_col)
return column, value

else: # Minimizing player
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