This page explains how David L Phelps (USATT# 16708)'s rating went from 1633 to 1627 at the Piedmont TT Open held on - 6 Apr 2002. 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.