The original approach for calculating winnability first checked for
inter-column movements, which isn't ideal, instead, the new logic now
first attempts to make foundation pile movements. Additionally, this
converts the function to return an option value, which will be null if
the winnability check fails to determine the result within given maximum
depth. This is a necessary check, as the original logic took really long
to finish, especially if ran at the beginning of the game, where it
could keep going for hundreds of moves.
ItsDrike
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