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Concise Guide to Chess Variants. Missing description[All Comments] [Add Comment or Rating]
Jörg Knappen wrote on Tue, Dec 27, 2011 10:22 AM EST:Excellent ★★★★★
David, that's a aice X-mas present for all of us!

There is one minor poiint I want to correct (it is not your fault; already Jeliss has this particular sentence wrong):

>null piece (Exotic): n. Piece that, combined with any other piece leaves it unaltered = Dummy = (0,0) leaper. Not the same as zero. Link(s): All the King's Men. [index] Source(s): [ATKM] Unique ID: [CVT-10825]

A dummy is a piece without any move; as a leaper it is an \emptyset-leaper, not a (0,0)-leaper. A (0,0)-leaper has one move to its starting square, essentially the piece-bound licence to pass a move.

This is always confounding to see that zero is something different from the emptyset.