This page explains how Thomas R. Lawson (USATT# 7600)'s rating went from 1821 to 1820 at the Rockford Spring Open held on - 17 Apr 2004. 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.