This page explains how Tom A. Sacra (USATT# 54376)'s rating went from 1506 to 1505 at the Southwest Open held on - 1 Jun 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.