This page explains how Umar Brown (USATT# 83534)'s rating went from 980 to 950 at the Bumpernets Winter '09 T.T. Doubles League event from 19 Feb 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.