Correct answer: Qd11...Kc2/Ne4/Nf1/Nf3/Nc4/Nb1 2.Rc4# 1.Rb4?? zz 1...Kc2/Nc4 2.Rc4# 1...Ne4/Nf1/Nf3/Nb1 2.Ra:b3#/Rc4