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Well I have recently submitted a variant using FIDE pieces with their
square-board definitions on a 3d board on which the ranks are hex boards
on their sides, to preserve the square-board change-of-rank requirements
as with Quadlevel but through the nature of the pieces rather than any
weakening extra restrictions. Thus the Bishop in that game has no move
within a hex board.
Since my last comment here I have finally discovered the meaning of the
Hungarian Futar. It means runner, same as the German Laufer and Dutch
Loper.