Correct answer: Nb41.Bf4+?? 1...Ke4 2.Nf6# but 1...B:f4! 1.Ne3?? (2.Ng4#) 1...Ndb7 2.Nc4# but 1...Ncb7! 1.Ne7?? (2.Nc6#) 1...Bf4 2.B