This page explains how Mark Nordby (USATT# 8741)'s rating went from 2035 to 1991 at the Rockford May Open held on - 17 May 1997. 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.