Correct answer: d4+1...Kd4+ 2.N3f5# 1.Nf1+?? 1...Kf4+ 2.g5# 1...Kf6+ 2.Nf5# 1...Kd6+ 2.Bf5# but 1...Ne4! 1.N3f5+?? 1...Kf4 2.g5#/Bg3#
