Correct answer: Nh61...B:e3+ 2.Nd4# 1.Nf6+?? 1...Kf5 2.N:d4#/Ne1#/Na1#/Na3# but 1...g:f6! 1.Bf4+?? 1...Be5+ 2.Nd4# but 1...Kf5! 1.N