This page explains how Mark Nordby (USATT# 8741)'s rating went from 2261 to 2256 at the St. Joseph Valley Open held on - 22 May 2005. 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.