Trivially, you'd iterate i from 0-63 and then do 10 bit checks per value of i in order to determine what piece, if any, is on tile i. You could probably optimiz

Trivially, you'd iterate i from 0-63 and then do 10 bit checks per value of i in order to determine what piece, if any, is on tile i. You could probably optimize it further, but that'd be hella fast on any device I can think of, and would take very little code to implement.