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Here is a fun case to consider: Black owns an Eagle (a problemist piece; it moves on queen lines until it meets a hurdle, turns 90 degrees on the hurdle and ends capturing or non-capturing on a square besides the hurdle). Now black has a King on e8 and an Eagle on g8, white has a King on e1 and a Rook on h1. After castling, the field f1 is attacked by the Eagle, because the King on g1 now acts as a hurdle.