Correct answer: Q:e71...f4 2.Nf3#[A] 1.Qb8? (2.Nf3#[A]) 1...Kd4/[б]/ 2.Q:b6# but 1...Kf4[a]! 1.Qh8? (2.Nd3#[Б]) 1...Kf4[a] 2.Qh6# but 1...Kd4/[б]/!