Correct answer: Kd41...b4 2.Nc4# 1.Kc6?? zz 1...b4 2.Nc4# but 1...Kb4! 1.Kd5?? zz 1...b4 2.Nc4# but 1...Kb4! 1.Kd6?? zz 1...b4 2.Nc4# but 1...Kb
