Correct answer: Ne51...f4 2.e4# 1.Nf6+?? 1...Ke5 2.Qa1#/Qa5#/Qd4#/Qf4#/Qb5# but 1...Kc5! 1.Nb6+?? 1...Ke5 2.Qd4#/Qf4# but 1...Kc5!