This page explains how John Laverty (USATT# 70441)'s rating went from 1092 to 1040 at the SVistaTT League event from 28 Apr 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.