Reading more closely into the related links and articles, the contest is a bit old...1999-2001. Iocaine Power finished 3rd later on, losing to its derivative, Greenberg. The year the article links to, you'll see that Josh from del.icio.us also entered his own bot in the contest, but didn't do nearly as well.

I wonder what the properties of the iterated roshambo is, and whether it applies to cooperation (or aggression in this case). I know that bittorrent uses Tit-for-tat for cooperation amongst its clients.