This page explains how Clark Tatum (USATT# 14519)'s rating went from 1580 to 1524 at the 2008 Austin Fall RR held on - 11 Oct 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.