Correct answer: Ke51...Ke8 2.Nd6# 1.Qd3+?? 1...Ke8/Kc6 2.Nd6# but 1...Kc8! 1.Nb:c7+?? 1...Kd6 2.Qh2#/Qg3#/Qd3#/Qa3#/Ra6#/e8N