Correct answer: e8N+1...K:e7 2.Bf8# 1.N5e4+?? 1...Kd7/Ke6 2.e8Q# but 1...K:e7! 1.Nb7+?? 1...Kd7/Ke6 2.e8Q# but 1...K:e7! 1.Nd1?? z
