Correct answer: Kc51.Ng6?? (2.Nf4#/Nf8#/Qe7#/Re5#) 1...Ba6 2.Qe7#/Nf4#/Nf8# 1...f6/f5 2.Qe7# but 1...f:g6! 1.N:f7?? (2.Nd8#) but 1...K:f7!