This page explains how Yahao Zhang (USATT# 31038)'s rating went from 2450 to 2450 at the Longmont Fall Open held on - 24 Oct 2009. 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.