Correct answer: Rf41...Kd6/Kc6 2.c8Q#/c8R# 1...Kc8 2.Nb6# 1.Nb6+?? 1...Kd6 2.c8Q#/c8R# but 1...Kc6! 1.Rb7?? zz 1...Kd6 2.c8Q#/c8
