This page explains how George Nie (USATT# 71290)'s rating went from 1812 to 1809 at the MDTTC Saturday League event from 1 Nov 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.