The Fall 2011 Google AI Challenge (Ants) is over (opens in new tab)

27th place's code and description of how it works: http://forums.aichallenge.org/viewtopic.php?f=24&t=2169&...

and profile: http://aichallenge.org/profile.php?user=3845

11th place's code: https://github.com/a1k0n/ants/tree/master/bot

and profile so you can watch how it works in action: http://aichallenge.org/profile.php?user=432

16th place's description of how their code works: http://www.decompilinglife.com/

and profile: http://aichallenge.org/profile.php?user=4728

Here are some histograms from before the finals of how different languages and countries did compared to each other: http://imgur.com/a/Li1b4

Overall Winner's Code and description of how it works: http://xathis.com/posts/ai-challenge-2011-ants.html