This page explains how Arlene Pfeil (USATT# 2673)'s rating went from 857 to 791 at the Boston TTC August Open held on - 4 Aug 2001. 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.