Correct answer: Bf11...d4 2.Bc4# 1...Nf6 2.Nc7# 1.Kb6?? zz 1...Nf6 2.Nc7# 1...d4 2.Bc4# but 1...g3! 1.Kb8?? zz 1...Nf6 2.Nc7# 1...d4 2.Bc4#
