This page explains how Roy Michael Dietz (USATT# 5368)'s rating went from 1775 to 1750 at the Columbus Giant RR held on - 17 Feb 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.