7 error

Failed Test: 7. Test functionality of AlphaBetaPlayer.alphabeta()
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AssertionError: False is not true : Your AlphaBetaAgent.alphabeta function returned a move that was not the optimal move for the given heurisitc. Make sure that you choose the first branch with the max score at the top level; branches searched later that return the same max score may only be returning an upper bound.
Expected Best Move:
(5, 5)
Your Selection: (7, 5)

Test Case Details:
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Heuristic: open_move_score
Depth limit: 1
Initial Board State:
     0   1   2   3   4   5   6   7   8
0  |   |   |   |   |   |   |   |   |   | 
1  |   |   |   |   |   |   |   |   |   | 
2  |   |   | - | - | - | - | - |   |   | 
3  |   |   |   | - | - | - | - |   |   | 
4  |   |   | - | - | - |   | - |   |   | 
5  |   |   | - | - | - |   | - |   |   | 
6  |   |   | - | 2 | - | - | - | 1 |   | 
7  |   |   |   |   | - |   |   |   |   | 
8  |   |   |   |   |   |   |   |   |   | 

game._board_state:
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 33, 69]