This page explains how John B. Allen (USATT# 3836)'s rating went from 2037 to 2030 at the Kentuckiana League event from 24 Jun 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.