Correct answer: Nec71.Nac7?? zz 1...Ka4 2.Qa3# 1...c5 2.Qb5# but 1...Ka5! 1.Nd4?? zz 1...Ka4/Ka5 2.Qa3# 1...c5 2.Qb5# but 1...Kc5! 1.Q