Correct answer: Re81.Nh6?? (2.Ng8#) but 1...K:e7! 1.Nd6?? zz 1...f:e6 2.Rf7# but 1...K:e7! 1.Rd7?? zz 1...K:e6 2.Rd6# but 1...f:e6! 1.Re8! zz 1.