Have you ever found yourself in a situation where you were giving 100% of your very best, executing almost flawlessly but you were still getting your ass kicked? What did you do in that situation?
I have been on both ends of this equation in Adventure Racing National Championship races as well as the business world, and found ways to both win AND lose "big races". Looking back, you will never, EVER regret fighting at 100% intensity to the very end.
Nothing is as satisfying as lying in a heap at the finish line (literal or figurative) completely exhausted, knowing you gave it everything you had.
You may come in 2nd, you may come in last, or you may even win...in the end you go with what you've got, make adjustments as nimbly as possible and NEVER EVER QUIT. Because guess what happens when you let up for even ONE SECOND? That's right, you get your damn ass kicked.