This page explains how Gordon MacDowell (USATT# 65540)'s rating went from 1612 to 1621 at the Arizona Sizzle Open held on - 18 Aug 1996. 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.