A secret to winning any game is to remember that you don't necessarily have to defeat your opponent, you just have to drive him beyond his tolerance for pain and frustration. It worked for the Vietnamese, and it can work for you. A victory by refusal to admit defeat is still a victory, after all.
If you can stubbornly resist being eliminated and dish out a level of frustration and pain out of proportion with your actual strength, you can convince your opponent to give up and either bother somebody else, or fold.
Above all else, quitters never win, and winners never quit. Never give up, never surrender!