This page explains how Henry E. Tiedeberg (USATT# 18820)'s rating went from 1177 to 1061 at the Clearwater Open Orange Blossom held on - 10 Jan 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.