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改进这个问题
您好，在这个tic-tac-toe python项目中，我总是收到一个平局游戏消息，我的知识中没有看到任何逻辑错误，请帮助我完成这个项目，这个代码中有任何逻辑错误，我定义的函数没有任何问题，一切正常，请帮我完成这个项目

print ('Welcome to tic tac toe')

   while True:
       the_board = [' ']*10
       player1_marker , player2_marker = player_input()
       turn = choose_first()
       print(turn+' will go first')

       start = input('Ready to play y or n')
       if start == 'y':
           game_on = True
       else:
           game_on = False

       while game_on:
           if turn == 'Player 1':
               display_board(the_board)
               position = player_choice(the_board) 
               place_marker(the_board,player1_marker,position)

               if win_check(the_board,player1_marker):
                   display_board(the_board)
                   print('Congradulation player 1 has won')
                   game_on= False
               else:
                   if full_board_check(the_board):
                       display_board(the_board)
                       print ('Tie game')
                       game_on = False
                   else:
                       turn = 'Player 2'
           else:
               display_board(the_board)
               position = player_choice(the_board) 
               place_marker(the_board,player2_marker,position)

               if win_check(the_board,player2_marker):
                   display_board(the_board)
                   print('Congradulation player 2 has won')
                   game_on= False
               else:
                   if full_board_check(the_board):
                           display_board(the_board)
                           print ('Tie game')
                           game_on= False
                   else:
                       turn = 'Player 1'

       if not replay():
               break