This page explains how George Nie (USATT# 71290)'s rating went from 1967 to 1990 at the MDTTC Saturday League event from 12 Feb 2012. 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.