This page explains how John B. Allen (USATT# 3836)'s rating went from 2172 to 2142 at the Kentuckiana League event from 5 May 2004. 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.