This page explains how Xianzhong Chen (USATT# 25249)'s rating went from 1828 to 1823 at the Allentown 'Sportsfest' 2 Perso held on - 13 Jul 2003. 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.