This page explains how Ogden Driggs (USATT# 5464)'s rating went from 1823 to 1820 at the Aurora TTC League event from 20 Mar 2009. 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.