Winning Form
No matter the existing advantage whether Class or otherwise, a horse which is not in top Current Form today, will be vulnerable of losing to another horse, if the other horse will be running at peak form.
Here we point to one of the greatest "Class" horses ever, possibly the greatest we will ever see in our lifetimes, Zenyatta, the queen; who did everything asked of her with a dance and a smile - true Thoroughbred Class.