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Let me give an IAGO spin on this (not meant to be 'my' spin, but it is
mostly mine at this point).  As of this point, a categorization of games
involving capture is that they are broken into two categories, these being
multi-elimination (Checkers) and Royal Elimination (Chess).  Royal
elimination games involve one or more classes of 'Royal' pieces, where
the objective is to eliminate or neutralize a particular class or sets of
classes.  In multi-elimination, the objective is to eliminate all or most
of the pieces.

Based on this spin, the games on the chess variants site should fit into
the Royal Elimination category, unless you talk Axis and Allies Chess. 
And under this criterion, then I see Tzaar being a game that would fit
here.  It is in the extinction chess category, where you get to fuse
pieces together to make them more powerful.