Correct answer: Nb21...Kc6 2.Qc5# 1.Qa5+?? 1...Kc6 2.Qc5# but 1...Kc4! 1.Qc5+?? 1...Ka6 2.Qa5# but 1...K:a4! 1.Nc3+?? 1...Kb4 2.Q