Correct answer: N:c41.Kc7?? (2.Qd6#) but 1...K:d4! 1.Bg8+?? 1...K:d4 2.Qf4# but 1...Ke4! 1.N:b4+?? 1...K:d4 2.Ng4# but 1...c:b4! 1.Qf7+??
