Correct answer: Nd51.Qd6?? (2.Bd3#) but 1...Ka6! 1.Qd5+?? 1...K:b6 2.Qa5#/Qb7# 1...Ka6 2.Qa5# but 1...K:b4! 1.Qc8?? zz 1...K:b6 2.Q