Correct answer: Rd81...Kd5 2.Qd3# 1.Rb4+?? 1...Kd5 2.Qc4#/Qd2#/Qd1#/Qd3#/Qe4# 1...c4 2.Q:c4# but 1...c:b4! 1.Rc8?? zz 1...Kd5 2.Qd3#