def _check_winner(state: GameState) -> bool:
return _all_same(state.get_first_column()) or \
_all_same(state.get_first_row()) or \
_all_same(state.get_second_column()) or \
_all_same(state.get_second_row()) or \
_all_same(state.get_third_column()) or \
_all_same(state.get_third_row()) or \
_all_same(state.get_top_left_diagonal()) or \
_all_same(state.get_top_right_diagonal())