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At the moment there seems to be only 1 preset (luckily not rule enforcing) for 4-handed Chaturanga variants, of which there is at the least one spinoff Chaturanga variant.

In such a case, all I can think of in order to alert a potential Game Courier opponent of the exact variant desired, in advance of them possibly accepting an invitation, is to contact them first in another way. That's including by making a public comment (such as this one) on chessvariants.com. 

Following that, one (or more) personal invitation(s) can be issued, with the exact Chaturanga variant agreed upon in advance of them accepting. Anyone please let me know if I'm missing something.

A variant of Chaturanga I am rather interested in is "Chaturanga - Four Kings - Double Mate". A link from chessvariants.com follows:

http://www.chessvariants.com/index/msdisplay.php?itemid=MSchaturangafour