Correct answer: Qa61...b4 2.Qa4# 1.Q:b8?? (2.Qc7#) but 1...b4! 1.d7?? (2.d8N#) 1...b4 2.Qa4# but 1...Bc7! 1.Qa6! zz 1...b4 2.Qa4# 1...Bc7 2.b:c7# 1.