Correct answer: Nc31.Nc6+?? 1...Ke4 2.Nc3#/Nd6# but 1...d:c6! 1.Nd6?? zz 1...Kd4 2.Bf6# 1...K:d6 2.Bf4# but 1...d4! 1.Nc3! zz 1...Kd4 2.