This page explains how Jack (John) E. Beggin (USATT# 23691)'s rating went from 910 to 891 at the St. Joseph Valley Open held on - 26 May 2002. 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.