Correct answer: O-O-O1...K:g1 2.O-O-O# 1...Bg4/Bf5/Be6/Bd7/Bc8 2.Q:g2# 1.Bh2?? zz 1...Bg4/Bf5/Be6/Bd7/Bc8 2.Q:g2# but 1...K:h2!
