This page explains how Jon Eric Gustavson (USATT# 20075)'s rating went from 1565 to 1521 at the 2007 Gwinnett Open RR held on - 15 Sep 2007. 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.