This page explains how Jian Zhuang (USATT# 55345)'s rating went from 1883 to 1880 at the 2007 Berkeley Open held on - 16 Sep 2007. 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.