Ages ago, I described a form of 3D chess of my own invention
on my web site, at:
http://www.quadibloc.com/chess/ch0603.htm
Just lately, I've finally added a page on existing forms of 3D
chess, particularly Maack's Raumschach:
http://www.quadibloc.com/chess/ch0505.htm
and I followed that up with a page about what is likely to be
the only form of 3D chess that most people have even ever
heard of:
http://www.quadibloc.com/chess/ch050501.htm
There are better accounts than the very brief one I give
of the rules that had been arrived at to allow a game to be
played on the Star Trek board, one is at
http://www.thedance.net/~roth/TECHBLOG/chess.html
but the significant thing about my page is that as
I felt there were flaws in the rules that Franz Joseph
came up with and Bartmess elaborated upon, I give
an alternative set of rules that addresses those issues.
John Savard