This page explains how William D. Goodfellow (USATT# 90074)'s rating went from 1356 to 1342 at the Schaumburg Summer Open held on - 27 Jul 2013. 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.