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CompWebChess 2 is an open source web-based chess program and application which allows you to play chess over the internet in a turn-based setting, using PHP and MySQL. Home Page: http://www.trimBrain.com
Database driven multiplayer chess that play like classic correspondence chess. This is 1st release that isn't design as plug and play chess games, you should make some mods. Please go to http://www.bebogame.com and see how it is implemented fully.
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