This page explains how John Laverty (USATT# 70441)'s rating went from 1018 to 1014 at the SVistaTT League event from 7 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.