Just noticed while playing a few games, the king was
the only black piece left on the board. While I was
running him around, he moved into the same row of the
white queen. There were no pieces in between or
anything, he shouldn't have been able to move there.
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I've seen this as well, it can also happen with the rook.
No luck yet in tracking it down.
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Finally found and fixed this one, it was a copy paste bug.