Correct answer: Nf61...Kc5 2.Qc4# 1.Kf7?? zz 1...Kc5 2.Qc4# but 1...c:b6! 1.Kg8?? zz 1...Kc5 2.Qc4# but 1...c:b6! 1.Kg7?? zz 1...Kc5 2.Qc4#
