Correct answer: Qb11.Nc7?? zz 1...K:c7 2.Qb7# 1...Ke7 2.Qh7# but 1...d5! 1.Qh7+?? 1...Ke6 2.Nc7#/Qf5# but 1...Kc6! 1.Qf1?? zz 1...Kc
