Correct answer: Be41...f:g3 2.Q:g3# 1...Bc7 2.B:c7# 1...B:b8 2.Q:b8# 1.Qg7?? zz 1...Bc7 2.B:c7# 1...f:g3 2.Q:g3# but 1...B:b8! 1.Qg6?? zz 1...