This page explains how Don Husmann (USATT# 20881)'s rating went from 934 to 891 at the 2008 Bay State Giant RR held on - 28 Sep 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.