This page explains how Claude Boulard (USATT# 197)'s rating went from 1889 to 1891 at the GHTTC Augsut 2011 Open held on - 7 Aug 2011. 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.