This page explains how John Laverty (USATT# 70441)'s rating went from 1048 to 1028 at the SVistaTT League event from 19 Jul 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.