This page explains how David L. MacGregor (USATT# 55325)'s rating went from 1358 to 1318 at the Schaumburg RR Open held on - 4 May 2002. 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.