This page explains how Jim Wilson (USATT# 45685)'s rating went from 1869 to 1858 at the 2009 Austin Fall Round Robin held on - 7 Nov 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.