Correct answer: Qe51...Kb8 2.Qd8# 1.Kb6?? (2.Qa8#) but 1...Kb8! 1.Qb5?? zz 1...Kd8 2.Qb8#/Qd7# but 1...Kc7! 1.Qd5?? zz 1...Kb8 2.Q