This page explains how Dierdre Bubb (USATT# 80012)'s rating went from 300 to 309 at the Beginner League event from 21 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.