This page explains how Ying Zou (USATT# 33510)'s rating went from 1559 to 1557 at the 2007 Life Open held on - 24 Jun 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.