This page explains how John B. Allen (USATT# 3836)'s rating went from 2045 to 2041 at the Kentuckiana League event from 11 May 2011. 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.