This page explains how Joanne Gipple (USATT# 20625)'s rating went from 1175 to 1164 at the Aurora TTC League event from 29 May 2008. 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.