Chess.com – Play Online

http://www.chess.com

Illinois Chess Association

http://www.il-chess.org

United States Chess Federation

http://www.uschess.org

Chess USA – Buy Chess Sets

http://www.chessusa.com/

ChessBase Software

https://en.chessbase.com/

World Chess Federation

https://www.fide.com/

Illinois High School Association

http://ihsa.org/SportsActivities/Chess.aspx

Chess Tactics Server

http://chess.emrald.net/