This page explains how Brian Hutchins-Knowle (USATT# 62550)'s rating went from 1659 to 1623 at the ICC - Advanced League event from 15 Mar 2010. 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.