If you want to play Chess online for real, there is a website that I frequent whenever I have writer's block or need to work out a plot for a story. It's http://www.letsplay.com
They have chess, reversi, checkrs, backgammon, some words games, along with a few others.
I usually hang out in the word games area or the mahjong area.
You don't even have to have real money to play. You can set up an account using playbucks.