Correct answer: Nh51...K:d6 2.Nb4# 1.Nf4+?? 1...K:f6 2.Ngh5#/Ne8#/e8N# but 1...K:f4! 1.Nh5! (2.Ne3#/Ndf4#/Nc3#/Nc7#/Nb4#/N:b6#)
