Correct answer: Rc51...Nf3/Qh6/Qh7/Qh8 2.Nf2# 1...Q:g4+ 2.R:g4# 1...B:c4+ 2.R:c4# 1...Rb5 2.Nd2# 1.Bd5+?? 1...Kf5 2.Rf8# but 1...K<