This page explains how Derrick Cone (USATT# 64672)'s rating went from 2084 to 2038 at the AZ PTTC Monday event from 13 May 2013. 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.