Correct answer: Kf71...K:f3 2.Ng5# 1...Kd3 2.Nc5# 1.Qb2?? zz 1...K:f3 2.Ng5# 1...Kf5/Kd5 2.Q:e5# 1...Kd3 2.Nc5# but 1...c5! 1.Q:c6
