This page explains how John Laverty (USATT# 70441)'s rating went from 1036 to 1026 at the SVistaTT League event from 16 May 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.