Correct answer: Nd4+1...Kf6 2.Qe7# 1.Ng7+?? 1...Kf4 2.Ne6# 1...Kd4 2.Qb4# 1...Kd6 2.Rd5# but 1...Kf6! 1.Ke3?? zz 1...Kf6 2.Qe7#
