I went to see one of the championship finals a few years ago, and it is excellent fun. There are two built-in moments which are bound to be awesome: (1) when the box round is over, tension is through the roof, and the boxers are sat down around a chess board with classical music on, and (2) when two steps before a chess mate, the about-to-lose guy has three minutes to beat out all the smart from the opponent. Best spectator sport I can imagine, can only recommend to see one.