Correct answer: Bc51...f3 2.Bc1# 1.Bb2?? zz 1...f3 2.Bc1# but 1...c:b2! 1.Bd3?? zz 1...f3 2.Bc1# but 1...c2! 1.Be4?? zz 1...f3 2.Bc1# but 1...c2! 1.Bh7??
