I'm going with the obvious 1...h3-h2
The Bishop on g3 states the pawn did not come from g3.
The b7 Rook not have taken anything on b7 becuase
there is nothing left to take on b7.
The Black pawn on d4 has captured something so has
the pawn on e5.
The pawn on d4 did not take anything last move
because where did it come from?
The pawn on e5 must have taken 2 captures to get from g7 to e5
so once again you have run out of captures.
I'm wrong. I know I'm wrong because I never get any of
Swiss Gambit's puzzles right. I hate him.