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Fergus Duniho wrote on 2020-06-25 UTC

As long as you evaluate actual moves in the Post-Move sections, you have to bear in mind that potential moves are evaluated before a move would be made, and actual moves are evaluated after a move has been made. This means that you have to sometimes use different code for potential and actual moves. That's true of the King here. You should use both a function and a subroutine for the King's movement. The function should handle only potential moves, and it should stop a King from making its special move out of check before it makes its move. The subroutine should handle actual moves, and it should undo a King's special move after it has been made to make sure the King didn't move out of check with that move, then redo it if it was legal.

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