This page explains how David Yong-Xiang Zhuang (USATT# 58322)'s rating went from 2647 to 2629 at the USATT Nationals held on - 21 Dec 2013. 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.