Wrong test

My program fails because of the test

assert max_checkers_capture(9, (6, 4), [(7, 1), (0, 0), (3, 1), (3, 7), (7, 0), (5, 7), (3, 0), (5, 0), (6, 6), (1, 3)]) == 0

The assertion is wrong, (6,4) captures (3,1) on this board.