This page explains how Thomas H. Shirley (USATT# 9977)'s rating went from 1718 to 1715 at the 1998 Millcreek Open held on - 18 Oct 1998. 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.