I usually play on Chess.com on my break at work. They started to block websites that have games.
Something similar was done in our workplace 35 years ago. Game playing was blocked except during the lunch break, or before or after work.
Who ever you work for is obviously worried about the one day take over of chess player's all over the world. The chess age is about to begin. viva la en passant. I suggest asking your boss to join you in a friendly game after work, then once he's had his first hit he'll be hooked for life or you could just use a proxy website.
P.S.
rekkie you can come in my backdoor. 
A simple solution that could possibly work (depending on how the site is blocked) is just going to 67.201.34.176 which is the ip address for chess.com.
Not anymore. The address has changed.
I usually play on Chess.com on my break at work. They started to block websites that have games. Does anybody know if there is a back door way to get on to Chess.com?
One way is to use translate.google.com and translate a website, then it gets unblocked.
Another way is to use Chesskid.com
Try Xiangqi.com. Its a Chinese Chess website thats a lot more complicated though.
Disregard my previous...missed the "on my break" part.