How do horses place?

I'm just curious, forgive me if this post already exists :P
How are horses are chosen to place in shows? I know stats heavily influence it, but is it just determined by stats alone? The horse with the best stats wins?

Stats and tack, I believe, but also there is a luck factor in it. 

I have a very in depth explanation in my guide to Successful Showing, but it does basically boil down to stats and training level. Stats Should be the highest in the discipline stats, tack adds additional stats to the horse's total in the discipline stats(high level and correct discipline being important), and then a horse's training level affects it's luck factor. Which means a horse has a better chance of winning at a higher Training Level, but not garunteed. If trained every day a horse can reach Level 5 the training level max by age 13.

In the past it was also suggested that Care also played a part in your horse's placement but it was never proven or refuted, but I still always care for my horses before showing (which is a good practice anyway because while your horses can die without care not showing them for a day won't hurt them).

Thank you, Sabriel!