Correct answer: Na61.Nc6? zz 1...Kc8[a] 2.Ba6#[A] 1...Ka8/[б]/ 2.b7#[Б] but 1...K:c6! 1.Na6! zz 1...Kc8[a] 2.b7#[Б] 1...Kc6/Ka8/[б]/ 2.Bg2#[C]