Correct answer: Ke41...Kc1 2.Nd3# 1...Ka3 2.Nc4# 1.Kd3?? zz 1...Ka1 2.Bd4# 1...Ka3 2.Nc4# but 1...Kc1! 1.Kd5?? zz 1...Kc1 2.Nd3#
