Correct answer: Rc81...K:c4 2.Q:c3# 1.Rd8?? zz 1...K:c4 2.Q:c3# 1...Kb6 2.Qf2# but 1...Kb4! 1.Ra4?? zz 1...Kd4 2.Ne6#/Qf2# but 1...K