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It is not my intention to represent every variant position by X-FEN. I
would be happy to cover a lot of variants having gait combinations in
their pieces strongly related to traditional chess. Maybe you noticed
SMIRF naming itself a FullChess engine. SMIRF does it covering dual
combinations of N, B and R. Coming Octopus is intended to cover some
additional combinations, too. 

FEN stems from traditional Chess. Thus I am convinced that using X-FEN
makes sense the more the variants it supports would be related to chess.
My X-FEN approach therefore is not thought to be a base for Zillion
positions. 

As long as X-FEN belongs to that idea, the handling of variant names and
pieces names as a kind of comment will work best. Thus I will remain in
the neighbourhood of Chess.