This page explains how Keith Willard (USATT# 95826)'s rating went from 828 to 817 at the Bloomington Armory Community League event from 23 Feb 2015. 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.