H. G. Muller wrote on Tue, Jul 8, 2014 06:53 AM UTC:
I just made a Fairy-Max derivative that is able to handle rifle captures, next to its ordinary move repertoire. I used it to test some pieces that could rifle-capture their direct neighbors (cK-bK in Betza 2.0 notation), in addition to other moves. One thing I noticed watching the games is that pieces can be guarded by attacking their attacker.
BTW, the K rifle captures on a piece that did not have any K moves was worth about the same, or even slightly more as having all K moves (m + c) on that piece.