This page explains how Mark J. Hoffman (USATT# 24438)'s rating went from 1529 to 1501 at the Schaumburg Spring Open held on - 14 Mar 2009. 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.