In 2016, CHASA moved to a ranking formula called the Rating Percentage Index (RPI) to rank varsity team sports for playoffs. It is used by NCAA and considers not only a team’s record, but the strength of the teams played.
This formula will be used for all team sports across Colorado including Baseball, Basketball, Football, Hockey, Lacrosse, Soccer, Softball, and Volleyball. It does not apply to sports dominated by individual performance such as Gymnastics, Tennis, Track & Field, etc.
Here is an article found on the CHSAANow website that explains the system.