Ben Reiniger wrote on Thu, Nov 5, 2015 05:16 PM UTC:
Thanks for the additional diagrams. The pawns then have essentially three "forward" directions and one lateral, and you do allow a capturing move that is "forward" in two directions. It's maybe interesting then that pawns start at different distances to their promotion zone, but they can speed ahead sometimes with capture.
I'll look more carefully later, but in your first checkmate diagram, can't the king escape to 4334 or 4434?