We assert that Thoroughbreds are often great horses for the Adult Amateur and Young Rider. We can say that because we play, and compete, using other groups' rulebooks. Then we record our individual horse's results in open company (all breeds) according to their organization's standards. Here are some of the rulebooks we follow... beginning with the Thoroughbred's birth registry:
The Jockey Club Rulebook
In all matters of breed: from how we identify a Thoroughbred to enforcing all applicable Jockey Club rules. We maintain transparency and compliance in all matters so our horses are easily recognized by The Jockey Club and its International Studbook Committee. And with that, universal worldwide acceptance.
USDF Rulebook and USEF Rulebook
The United States Dressage Federation (USDF). And USDF's governing body, the United States Equestrian Federation (USEF).
USEA Rulebook and USHJA Rulebook The United States Eventing Association (USEA) and United States Hunter Jumper Association (USHJA). The governing body for both these orgs is the United States Equestrian Federation (USEF).
Competitions we participate in are sometimes governed by the Fédération Equestre Internationale (FEI)...
Wait, There's More Our horses also compete and perform well to other rulebooks, for example: American Pinto Association, North American Trail Ride Conference, etc. It's not just us declaring we're good. How good? See for yourself.