This page explains how Hal Barnes (USATT# 72469)'s rating went from 1579 to 1572 at the 2012 Butterfly MDTTC Open held on - 23 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.