CCRL 40/4: http://computerchess.org.uk/ccrl/404/
CCRL 40/40: http://computerchess.org.uk/ccrl/4040/
IPON: http://www.inwoba.de/
SWCR: http://www.amateurschach.de/
CEGT: http://www.husvankempen.de/nunn/


Does anybody have a proof that rating list ELO correlates to chess playing skill?

Or that ...