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Alice Chess. Play this classic variant in which pieces switch between boards whenever they move. (Recognized!)[All Comments] [Add Comment or Rating]
H. G. Muller wrote on 2013-03-25 UTC
Perhaps the interpretation is that a move that interposes is "legal on the board it is played" because there is no King on that board. The King remains in check on the other board by playing the move (before the transfer), but that does not make the move illegal on the board without King. So the conditions are:

1) You must play a move that would be strictly legal on the board it is played if that were the only board
2) The move must not end on a square that is occupied on the other board, and after the move you must transfer the piece there
3) After you thus complete a move, the opponent must not be able to capture your King with his reply