This page explains how David Edwards (USATT# 33602)'s rating went from 1658 to 1644 at the USATT Nationals Championships held on - 20 Dec 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.