Recursion leads to remainders #4
Description
When trying to skip 3 pieces, you are losing some skipped pieces on your way, because of no concatenation of previous skipped pieces of previous recursion iteration.
Suggested fix (I can create a pull request and fix the issue if you grant me the access), e.g from traverse left:
moves.update(self._traverse_left(r+step, row, step, color, left-1,skipped=skipped+last))
Example for a problematic board state:
