This page explains how George Nie (USATT# 71290)'s rating went from 1818 to 1807 at the MDTTC Saturday League event from 27 Sep 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.