Correct answer: Qa21...Ka7/b5 2.Q:b7# 1...b:a5 2.Q:a5# 1.Qd7?? zz 1...Ka7/b5 2.Q:b7# but 1...b:a5! 1.Qe4?? zz 1...Ka7/b5 2.Q:b7# 1...Kb5 2.Qc4#