Correct answer: Rb41...Nd4 2.Qe7# 1...c:d5 2.Bb4# 1.Qe7+?? 1...Nd6 2.Qe3# but 1...Kd4! 1.Rb4! (2.Q:c6#/Rc4#) 1...Nc7/Na3 2.Q:c6#/Q