This page explains how Danuta M. Andrzejewska (USATT# 58353)'s rating went from 1686 to 1680 at the Chicago Ping Pong 2000 held on - 22 Sep 2000. 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.