Correct answer: Rd71...Nb6 2.R5:b6# 1...Nc7 2.R5b6#/R7b6# 1.Ke6?? zz 1...Nb6 2.R5:b6# but 1...Nc7+! 1.Kd8?? zz 1...Nb6/Nc7 2.R5:b6#/