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A PHP Web Application that you can install on your own web server. It allows you to play chess with other users across the internet or sitting at the same screen. It only permits valid moves and can automatically detect check and checkmate status.
This sofware is designed to help different chess clubs to set up their own rating system. It uses USCF approximation formulas for rating calculations. Working example at newarkcc.vfutbole.ru
Chessd is a chess XMPP based server. It uses a web interface and a BOSH server, that runs between interface and the chess server. Visit http://xadrezlivre.c3sl.ufpr.br to see it in action.