This page explains how Roger Barr (USATT# 17477)'s rating went from 1089 to 1080 at the NJTTC Monday League event from 2 Oct 2006. 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.