This page explains how John Laverty (USATT# 70441)'s rating went from 1200 to 1183 at the SVistaTT League event from 26 Jan 2005. 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.