Correct answer: Nd81...R:g4+ 2.K:g4# 1...Rc5 2.b:c5# 1.Nd8! (2.Nb7#) 1...Bd5 2.Nb5# 1...Ba6 2.Nf7# 1...Rdd5 2.Re6# 1...R:g4+ 2.K