If you don't want to play a game resign and move on... don't start new games if you can't play the ones you got going...
Have the balls to say I'm done... and resign like a man if you don't want to play.
P.S. You will be a much better player playing a loosing game vs a good player vs playing a winning game vs a bad player. I have learned much more from my losses than I would ever learn from my victories.
