# Basit oyun tahtası
board = [[" " for _ in range(3)] for _ in range(3)]

def print_board():
    for row in board:
        print("|".join(row))
    print("-" * 5)

def check_winner():
    for row in board:
        if row[0] == row[1] == row[2] != " ":
            return True
    for col in range(3):
        if board[0][col] == board[1][col] == board[2][col] != " ":
            return True
    if board[0][0] == board[1][1] == board[2][2] != " " or \
       board[0][2] == board[1][1] == board[2][0] != " ":
        return True
    return False