Correct answer: Na71...K:e6 2.e8Q# 1.Ncd6?? zz 1...K:e6 2.e8Q# 1...Nh2/Nf2/Nf6/Ne3 2.Nf7# but 1...Nh6! 1.Nb6?? zz 1...K:e6 2.e8Q<