Solution Haring 7:

I agree this was a difficult one. The position seems to be impossible to solve, but with this problem you have to study further then usualy and reckon with all the possibilities, like in this strange problem: with the last move of black: this could only be f7-f( and gives so white the opportunity to take "en passant":

Key: g x f6 ep

If 1).........e x f6      then 2) Rook f6 mate

if 1).........K x h6     then 2) f5 mate