This page explains how Roger Barr (USATT# 17477)'s rating went from 1200 to 1126 at the NJTTC Monday League event from 29 Nov 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.