Hello Kareen,
I think it’s as important as in jumping. You don’t really see it because the match are longer than a jumping show and we play with many horses but to the same level, the player who has the best horse would make the difference, because he’d be able to make game choices than the other couldn’t to do so, he’ll be able to make mistakes and his horse would be able to correct that mistake. I think that the horse makes a huge difference.
PH