This page explains how Jerry Packard (USATT# 49577)'s rating went from 1239 to 1198 at the Champaign Butterfly Open Winter Giant RR held on - 9 Feb 2013. 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.