Alice Chess, anyone? I have read about it at British Chess Variants Society, and the work of David Pritchard. It can be accessed at ChessVariants to see about it. Ed Friedlander has a simple PixelPusher program where you can practice it, if the mood strikes.
It plays as standard chess, but two boards are used, and when you make a move on one board, the activated piece moves to the other board.
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