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H. G. Muller wrote on Thu, Mar 26, 2020 05:57 AM EDT:

But that's not true of other pieces. Other pieces retain checking power during the opponent's move.

That is exactly what I disagre with. Checking power is defined as the ability to make an actual capture after the opponent passes his turn (thus giving the turn back to the owner of the checking piece).

So the question is really how the Joker must move after a turn pass, because such a turn pass cannot be assigned to any particular piece. Must it then also pass its turn, or does it retain the powers it had on the move before? This question is important to distinguish checkmate from stalemate.

For 'passing through check' turn passing plays no role, though. The King was already moving when it reached the square it aims to pass through. The logical approach is to evaluate the situation under the fiction that he would stop there, and then the last move would have been a King move. So I would say the Joker has to be assumed to move as a King in order to judge whether the King passed through its attack. Even when the ultimate rule for Joker movement after a complete castling would be that it should move like a Rook. (E.g. because castling according to FIDE rules must first move the King, and then the Rook, so the Rook would be the last moved piece.)


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