Correct answer: Rc11...K:c6 2.Nb4#/R:c5# 1.Rg5+?? 1...K:c6 2.Nb4#/Rg:c5#/Rc:c5# but 1...K:c4! 1.Rd1+?? 1...K:c4 2.Na5# 1...K:c6 2.