This page explains how Joseph Yoon (USATT# 22410)'s rating went from 2143 to 2109 at the 2009 Badger Open held on - 20 Sep 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.