On: Learn to play chess online

[zappo2938]

Lichess.org is fun too. I'm not much of a chess player but I sometimes find the chess puzzles to be fun at http://en.lichess.org/training

[cmdz0rd → zappo2938]

That is really useful, I like assortments of puzzles like these. They keep my brain sharp.

[Scarblac → cmdz0rd]

http://chesstempo.com is the state of the art for tactics puzzles auto-adjusted to your strength.

[HardDaysKnight → Scarblac]

And for the ability to review already seen problems using spaced repetition.