Correct answer: Bf21...f4 2.Rh5# 1.Be1?? zz 1...Ke5 2.f4# 1...f4 2.Rh5# but 1...Kc5! 1.Bc7?? zz 1...f4 2.Rh5# but 1...Kc5! 1.Bb8?? zz 1...f4 2.R<