Correct answer: O-O-O1...K:g1 2.O-O-O# 1...Nh6/Nf2/Nf6/Ne3/Ne5 2.Q:h2# 1.Ra2?? zz 1...Nh6/Nf2/Nf6/Ne3/Ne5 2.Q:h2# but 1...K:g1!
