Correct answer: Rd21...e:d4 2.B:f4# 1.Ng1?? zz 1...e:d4 2.B:f4# but 1...Kg5! 1.Ng5?? (2.Ngf7#) but 1...K:g5! 1.Nf2?? zz 1...e:d4 2.B:f4# but 1...Kg5!