Correct answer: Nf31...N:f4[a] 2.B:e4#[A] 1...B:f4/[б]/ 2.Be6#[Б] 1.N:e4? (2.Qg5#) 1...N:f4[a] 2.N:d6#[D] 1...B:f4/[б]/ 2.Qh7#[C] but 1...K:f4! 1.