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This condition in Zillions could probably be solved by having the dropped
Pawn trigger the opposing King to immediately capture the dropping
player's King(or a dummy piece on a dummy position which has been flagged
as checkmate-able) if it has no other option.

This may be accomplished by having this move placed within a specific
move-type, and this placed last in move-priorities.  In this move the King
will verify the attacking Pawn for last-to? and the position behind it to
be sure that it did not last-from? there.

This particular move would then prevent the placement of a drop Pawn in
this position since it would result in checkmate for the dropping player.

[I've actually tried this and, so far, it doesn't appear to work.
Some form of idiosyncracy related to the move-priority. Any ideas about
a work-around would be welcomed.]