Correct answer: Ne41.Nb1?? zz 1...Kc4 2.Na3# 1...Ka4 2.Nc3# but 1...a4! 1.Nb3?? zz 1...Kc4/a4 2.Qc5# but 1...Ka4! 1.Qb6+?? 1...Ka4 2.Q