This page explains how John B. Allen (USATT# 3836)'s rating went from 2050 to 2042 at the Kentuckiana League event from 18 Nov 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.