This page explains how Michael Walk (USATT# 10888)'s rating went from 2229 to 2221 at the 2009 PA State Championships Cl held on - 26 Apr 2009. 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.