Hello, could anybody tell me why the expect result of this combination is "false"?
It looks like we can get the string from belong sequence (2, 10) -> (3, 10) -> (4, 10) -> (5, 11) -> (6, 11) -> (7, 12) -> (8, 11).
(From random test case)

string to match: CFCDBEH
board:
{'R','O','U','S','Z','J','Q','L','O','S','G','Y','Y','H','E','X','T','T','W'},
{'O','E','R','T','U','Y','H','M','Y','U','W','J','N','M','D','F','L','M','W'},
{'W','C','Q','E','D','P','N','J','O','H','C','K','X','G','E','R','C','C','A'},
{'O','D','W','M','O','K','Y','R','P','L','F','L','J','K','C','N','N','T','B'},
{'Y','H','K','B','S','H','H','Y','A','M','C','A','C','F','X','P','V','H','P'},
{'O','Y','B','U','M','M','G','Q','A','V','J','D','T','Q','P','U','I','Y','E'},
{'I','Z','S','L','B','U','S','A','L','O','J','B','C','I','E','Y','U','Q','G'},
{'K','S','B','T','X','V','L','M','R','W','L','V','E','K','N','P','N','K','I'},
{'O','V','Y','X','Y','C','H','E','B','D','V','H','P','P','L','I','N','G','W'},
{'Z','X','S','K','V','W','W','K','M','K','U','W','A','S','W','X','Q','Y','H'},
{'V','B','K','S','L','A','J','W','K','W','E','G','Y','D','Y','I','A','V','H'},
{'L','J','T','H','H','T','Z','D','S','S','B','Z','N','F','K','H','Q','M','Q'},
{'O','W','N','S','D','L','X','D','V','Y','Y','E','L','J','X','S','Q','Q','U'},
{'V','L','M','Z','K','B','E','W','I','W','I','Y','K','F','N','E','K','A','B'},
{'N','Y','B','O','C','M','X','A','F','O','S','B','L','D','N','K','O','Q','O'},
{'K','Y','K','V','Y','W','A','O','A','M','O','E','Z','M','F','N','P','S','L'},
{'R','Z','B','J','A','M','N','P','Z','D','F','N','P','F','A','K','D','Y','M'},
{'R','Z','Y','I','F','Y','W','K','N','N','C','Y','E','D','B','O','F','Q','D'},
{'U','P','G','B','E','V','G','G','G','K','F','S','D','G','T','N','L','R','K'},