This page explains how C. James Williams (USATT# 11124)'s rating went from 1233 to 1202 at the 1999 Potomac Spring Open held on - 23 May 1999. 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.