Correct answer: Ne41...Nf6[a]/Ng7[a]/Nd6[a]/Nc7[a] 2.Nc7#[A] 1...Nb2/[б]//Nb6/[б]//Nc3/[б]//Nc5/[б]/ 2.Nb6#[Б] 1.b:a4?? (2.Nb6#[Б]) but 1...Kc4! 1.K<