This page explains how Neil Grey (USATT# 6269)'s rating went from 871 to 823 at the So. Florida US Open Warm-up held on - 30 Jun 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.