This page explains how William D. Goodfellow (USATT# 90074)'s rating went from 1441 to 1437 at the Spring Open held on - 4 May 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.