This page explains how Steven Lowry (USATT# 7907)'s rating went from 2219 to 2199 at the Pottsgrove TTC event from 11 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.