This page explains how Tung D. D. Phan (USATT# 9070)'s rating went from 2291 to 2289 at the 2010 US Nationals held on - 18 Dec 2010. 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.