Correct answer: Qf31...K:c4 2.Qa4# 1.Kd6?? zz 1...K:c4 2.Qa4# but 1...Kb5! 1.Nb2?? (2.Qa4#) but 1...Ka3! 1.Nb6?? (2.Qa4#) but 1...Ka3!
