This page explains how Gia Leu (USATT# 17561)'s rating went from 2028 to 2021 at the AZ PTTC Monday event from 21 Mar 2016. The links below take you to pages that describe various aspects of the rating processor.

The rating processor goes through 4 passes in order. The links take you to pages that provide detailed explanations of the calculations during each of the 4 passes.