This page explains how Don Ray Hamilton (USATT# 27945)'s rating went from 2138 to 2155 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.