This page explains how Sean(Zhongyi) Gao (USATT# 79899)'s rating went from 2099 to 2068 at the LYTTC December Open held on - 15 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.