Rules for tournament play
These are the rules established by chess.com. They are not negotiable. The reading, understanding and adherence to these rules is solely the responsibility of each individual member.
Rules for tournament play: http://www.chess.com/tournaments/help
Rule regarding withdrawals:
How do I withdraw from a tournament?
You are allowed to withdraw from a tournament at any time using the Withdraw link located on the right hand side of any tournament homepage. However, withdrawing from a tournament while you have games in progress will automatically cause you to forfeit all of the tournament games on time which will negatively affect your timeout % ratio and your rating, even if no moves have been made.