Correct answer: Re61...c5 2.Nb5#/R:d5# 1.Rd7?? zz 1...Kc5 2.Nd3# 1...c5 2.Nb5#/R:d5# but 1...e4! 1.Rd8?? zz 1...Kc5 2.Nd3# 1...c5 2.Nb5#/R