This page explains how Derrick Cone (USATT# 64672)'s rating went from 1983 to 1993 at the AZ PTTC Monday event from 6 Feb 2012. 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.