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 the alphabetic word product
Project Euler: Problem 3, Largest prime factor
Return area of square
Find the next Fibonacci number
Back to basics 18 - justification
Back to basics 11 - Max Integer
Back to basics 1 - Saving
Back to basics 25 - Valid variable names
Toolbox check part 3
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