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Tetrahedral Chess. Three dimensional variant with board in form of tetrahedron. (7x(), Cells: 84) [All Comments] [Add Comment or Rating]
Ben Reiniger wrote on Wed, Jan 29, 2014 01:37 AM UTC:
Pritchard's CECV lists a game "Xyrixa Chess" by David Samuel c.1980 played on this same board (provided I'm reading correctly).  It's not clear at all how the pieces move or whether the inventor knew about any of the geometry facts discussed in the other comments here.