This page explains how Roger Paul Haidvogel (USATT# 6361)'s rating went from 1835 to 1769 at the Walt Stephens Memorial Open 20 held on - 2 Nov 2002. 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.