This page explains how Rex J. Casstevens (USATT# 49120)'s rating went from 842 to 827 at the Schaumburg Fall Open held on - 22 Sep 2012. 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.