This page explains how Derek May (USATT# 8144)'s rating went from 2401 to 2382 at the 1999 Club Challenge and RR held on - 8 Aug 1999. 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.