This page explains how Larry Abass (USATT# 18017)'s rating went from 2270 to 2291 at the Club JOOLA in Rockville League event from 12 Oct 2008. 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.