Correct answer: Nd41.b8Q+?? 1...Ka6 2.Qb7#/Qb6#/Nc7#/Nb4# but 1...K:b8! 1.Nc7?? zz 1...Kb6 2.b8Q# but 1...Kb8! 1.Nb4?? zz 1...Kb6
