Correct answer: Qb11...N:e3 2.Nf6#[A] 1.Qb7? (2.Q:d5#) 1...Nb4[a] 2.Re7#[Б] 1...N:f4 2.R:f4#[C] but 1...B:g4! 1.Qd2? (2.Q:d3#) 1...Ne1/N