Correct answer: Qd71.Qc7? zz 1...Kc4 2.Nd4# 1...Ka6 2.Qb6# but 1...Ka4! 1.Qd7! zz 1...Kc4 2.Qd5# 1...Ka6 2.Nb8# 1...Ka4 2.Nd4#