I can back this up as being a true statement. He regularly plays bridge (and ping pong)on the Sunday following the Shareholders meeting. He does it out in public for people to watch. He is also a pretty strong advocate of the game.

Indeed. In fact, Buffet and Gates often play bridge together, both online and IRL.

My friend Fred Gitelman would suggest that some of Warren Buffet's best friends are bridge players:

http://en.wikipedia.org/wiki/Fred_Gitelman

Here is an Op-Ed in the NYTimes I managed to dig up written by Buffett's partner Sharon Osberg:

http://www.nytimes.com/2005/11/27/opinion/27osberg.html