This page explains how Thomas P. P. Mccormack (USATT# 6655)'s rating went from 1090 to 1002 at the Schaumburg TTC Spring Open held on - 29 Mar 2008. 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.