This page explains how Mark Kasdorf (USATT# 26450)'s rating went from 859 to 848 at the Mohawk Valley TTC League event from 20 Oct 2003. 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.