This page explains how Rex J. Casstevens (USATT# 49120)'s rating went from 841 to 830 at the 2014 Butterfly Aurora Cup held on - 19 Jan 2014. 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.