Not sure but I can try and find out. Why do you want to delete your account?
help
OK go to the help bar and one of the questions is "how do i delete my account" click on it and it will tell you

Contact Support here to close your account - http://support.chess.com/
- Send a ticket saying you want to close your account
- They should close your account very soon .
Sorry to see you didn't have a good time here :(
how do i delet my account!!!!