US Chess Federation (Popularity: )
http://www.uschess.org/ Mac software sold: Chess Mates, Chessmaster 6000, Essentia. Go to shopping area and search for "Mac" Category:
Shopping - Toys and Games - Games - Board Games
Internet Chess Club (Popularity: )
http://www.chessclub.com/ Top level competition for serious players. Chess variants are played here as well. There is a small fee for use of the server. Category:
Entertainment - Games - Video Games - Recreation - Board Games
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