Correct answer: Qb31...d4 2.Qe4# 1...g:f5 2.Qe3# 1.Kg3?? zz 1...g:f5 2.Qe3# but 1...d4! 1.f:g6?? zz 1...d4 2.Qe4# but 1...Ke6! 1.f6?? zz 1...d4 2.Qe4# but 1...K