Correct answer: Rb41.Rb3+?? 1...Nf3 2.Q:f3# 1...N:b3 2.Qf3#/Qg2# but 1...K:g4! 1.Rb4! (2.Qg2#) 1...K:g4/Nf3 2.Qf3# 1...Nc6 2.Q