This page explains how George Guo (USATT# 4780)'s rating went from 2221 to 2201 at the 75th Annual Michigan Closed 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.