This page explains how Mark Nordby (USATT# 8741)'s rating went from 2204 to 2139 at the St. Louis Gateway Open held on - 11 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.