Correct answer: Nb61.Ra4?? (2.Qe5#) but 1...Kd4! 1.Rc7+?? 1...Kd5 2.Qe5# 1...Kb4 2.Qb2# but 1...Kd4! 1.Qd2?? (2.Rc7#) but 1...K:c4! 1.<
