This page explains how Dick Peregrine (USATT# 20923)'s rating went from 1866 to 1852 at the Schaumburg Open held on - 6 Nov 2004. 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.