This page explains how Henry E. Tiedeberg (USATT# 18820)'s rating went from 851 to 836 at the 1st Annual Countryside 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.