This year's challenge is a territory-capture game called Coercion. Code a player in Java, C++, C#, Python, or JavaScript. Full details here: http://queue.acm.org/icpc/ The challenge has no prize, but is open to everyone.
ACM Queue Magazine is offering an online programming competition based on the 2011 International Collegiate Programming Competition (ICPC) Challenge problem. Participants will get to code a player and compete with others in the game of Coercion. Preliminary matches during the one-month coding phase will let you know how well your player is doing. A final double-elimination competition among all the submitted players will decide whose player is best.
http://queue.acm.org/icpc/index.cfm