Correct answer: Qg21...K:d5 2.Qe6# 1.Ba4?? zz 1...K:d5 2.Qe6# but 1...Kd3! 1.f4?? zz 1...K:d5 2.Qd3#/Qe6# but 1...Kb3! 1.Qh2?? zz 1...K<