This page explains how Claude Boulard (USATT# 197)'s rating went from 1604 to 1597 at the In the Red Open held on - 25 Apr 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.