This page explains how Mark Nordby (USATT# 8741)'s rating went from 2149 to 2109 at the St. Louis Gteway Open 2 Star T held on - 9 Aug 1998. 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.