Correct answer: Ng31.Ng7?? zz 1...Kh4 2.Be7# 1...Kh6 2.Bf4# but 1...Kf6! 1.Ng3! zz 1...Kh4 2.Be7# 1...Kh6 2.Bf4# 1...Kf6 2.Ne4#
