This page explains how Willem Vandermeulen (USATT# 283319)'s rating went from 944 to 930 at the Mohawk Valley TTC League event from 18 Dec 2007. 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.