This page explains how Lixin Lang (USATT# 52443)'s rating went from 2159 to 2159 at the MDTTC Saturday League event from 19 Apr 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.