Correct answer: Bd31...Kf6[a] 2.Ng4#[A] 1...Kd4/[б]/ 2.Nf3#[Б] 1.Kb4?? zz 1...Kf6[a] 2.Ng4#[A] 1...Kd4/[б]/ 2.Nf3#[Б] but 1...Kf4! 1.Kc5?? zz 1.