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http://www.chessvariants.org/d.betza/chessvar/3d/3dchess.html This site indicates there are at least 4 variations but basically one set of rules. "There are actually four slightly different games of 3D Chess. None of them is either a "more official" game, or a better or worse game, than the others; they are alternate games. These games differ only in their rules for the moves of the Pawn and Knight. All of them have the same set of rules, as follows:"...
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