Correct answer: Nc51...Nf6 2.Bd6#/Rg5#/Re7#/Qh2# 1.Re7+?? 1...Kf4 2.Q:e3# 1...K:d4 2.Bb2#/Q:e3#/Qd2# but 1...Kf6! 1.Rh5+?? 1.
