This page explains how Arlene Pfeil (USATT# 2673)'s rating went from 917 to 887 at the Orlando Winter Open held on - 1 Feb 2004. 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.