This page explains how Dierdre Bubb (USATT# 80012)'s rating went from 309 to 295 at the Beginner League event from 28 Jul 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.