Correct answer: Qd11...b2+ 2.Q:a2# 1...Q:a1 2.Q:a1# 1.Nc8?? zz 1...b2+ 2.Q:a2# 1...Q:a1 2.Q:a1# but 1...Ka4! 1.Nd7?? zz 1...b2+ 2.Q:a2# 1...Q