Here is a good site for the FIDE rules of chess. I would also include the USCF rules but I don’t think they are online anywhere. If anyone knows where I can find them online please let me know.
The site is http://www.kemmunet.net.mt/chessmalta/fidelaws/index.html which comes from the actual FIDE site of http://www.fide.com/official/handbook.asp?level=EE101.
So if you [...]