Correct answer: Bg51...Ng3 2.Q:f2# 1...d2 2.Be2# 1.Ng4?? (2.Nh2#/Ne5#) but 1...K:g4! 1.Nf7?? (2.Ne5#) but 1...Kg4! 1.Bf7?? (2.Bh5#) 1...N