This page explains how Richard Lee (USATT# 54845)'s rating went from 2444 to 2421 at the Club JOOLA in Rockville League event from 19 Oct 2008. 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.