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H.G.Muller's Point ''1) Move one piece at a time to an empty cell'' is
violated, as he recognizes can happen in coherent Chess-like game, by Witch
in Jacks & Witches, for one example. Witch drags another piece with it
without capturing. ''Witch does not kill,'' say Fourriere's
particular Rules there. So up to two pieces move when Witch moves.
Points ''2) through 6)'' are each more readily and frequently violated
than Point 1), as Muller would recognize. Here are exceptions to them: 2)
Ultima Withdrawer, Coordinator  3) Maxima's other win condition 4) Battle
Chieftain's one piece-type 5) Gilman's ''Pawnless'' ones 6) Rococo
Cannon Pawn. Each of the  6) points could list 100 easily, so maybe
definitions not that useful anymore. In fact, probably majority of CVs violate more
than 1 of the points -- thus making them not CVs strictly by Muller's statement -- depending on more precise honed meaning of ''very
close to a common variant.'' Here in CVPage ''very close to a common
variant'' even controversially, though inconsistently, excludes
different starting arrays.