This is a good problem, but it needs more test cases. There is no test with the King for instance, and there should be a true and false state test for every piece.
this doesn't take into account captures or moving a pawn 2 moves from its starting position. should it?
and the occasional other weird rules...
Captures and pawn 2 moves and castling and such aren't possible based upon the assumptions I stated (i.e. no other pieces on the board, the previous move was valid, etc)
Find common elements in matrix rows
Find perfect placement of non-rotating dominoes (easier)
Convert from Base 10 to base 5
Back to basics 23 - Triangular matrix
Back to basics 9 - Indexed References
Back to basics 15 - Benchmark
2 b | ~ 2 b
Back to basics 7 - Equal NaNs
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