This is  my fav chess web-site!

Tons of players from all over the world, whose level varies extremely: from amatorial to professional!!

Not only online matches, but also correspondence chess online, training, etc… and all for free!

You can also become a member, pay a fee and get some extra service. Personally, I have very nice time without having bought the membership.

If you want to improve and learn new skills, you should consult the study plan directory