Well, the 4-year-old who had been to a whopping one horse show, just to school—and mind you, was a very good boy, told another horse that he had "won lots of things that day.
My 16-year-old jumper schoolmaster told me when he was first imported that all he needed was to know the course and how many horses he had to beat and he was on it. And I’ll be damned, he was right as long as I didn’t screw it up. We also have it well-documented but the horse’s breathing would change after the jump-off buzzer. My trainer said he knew that once the buzzer went off and the horse started blowing in-step, he knew it was a lock.
My current mare, an 8-year-old who has jumped through 1.30m in Europe with no signs of being limited there, said that I personally, with my riding, will never reach the limits of her athletic ability. You have to basically get on her jockey-style at the show, while at home, she stands like a school pony — she definitely knows when she’s going to the ring.