The ICGA organises competitions between programs, that need some kind of intelligence such as Chess, Go, Chinese Chess, Backgammon and others. Recently games such as Poker, Bridge and Pool billiard have also been included in competitions. 

I was able to take part in (details on the specific page):

Bitmap of ICGA Logo Bitmap of ICGA Logo Bitmap of Computer Olympiad 2007
Leiden (Netherlands) 2015 Tilburg (Netherlands) 2011 Amsterdam (Netherlands) 2007
Bitmap of Computer Olympiad 2006 Bitmap of Computer Olympiad 2003 Bitmap of Computer Olympiad 2002
Turin (Italy) 2006
 
 
Graz (Austria) 2003 Maastricht (Netherlands) 2002


Unfortunately I can't attend events in Israel, Japan, China and Tapei as the travelling costs are too high for me.....