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 all elements less than 0 or greater than 10 and replace them with NaN
Extract leading non-zero digit
Test for balanced parentheses
Back to basics 14 - Keywords
Back to basics 11 - Max Integer
Back to basics 6 - Column Vector
Back to basics 13 - Input variables
Back to basics 12 - Input Arguments
Back to basics 18 - justification
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