All amateurs with the exception of aged based divisions, like Juniors or Masters and older, compete in divisions based on rating levels. You may not play in a lower division if your rating is above a certain number. The ratings breaks for each division is shown on page 5 of the PDGA Tour Standards. In addition, there are ratings events where everyone – Ams and Pros – play in a division based on their rating. Players are allowed to enter divisions higher than their current rating, just never below (except in Ratings Events where every player must play in the division their rating places them in).