This page explains how Sihai Chen (USATT# 75555)'s rating went from 1320 to 1291 at the Mohawk Valley TTC League event from 14 Dec 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.