This page explains how John Sweeney (USATT# 30938)'s rating went from 1624 to 1604 at the 2008 NA Tour Finals Open held on - 14 Sep 2008. 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.