This page explains how Lily Zhang (USATT# 31126)'s rating went from 2230 to 2329 at the USATT Nationals Championships held on - 20 Dec 2008. 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.