This page explains how Mark Nordby (USATT# 8741)'s rating went from 2075 to 1981 at the Schaumburg $1110 February Open held on - 21 Feb 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.