Correct answer: Qb81...Kd4 2.Qf4# 1.Qb7?? zz 1...d4 2.Qb5# but 1...Kd4! 1.Qb6?? zz 1...d4 2.Qb5# but 1...Kd4! 1.Qb8! zz 1...Kd4 2.Qf4#
