This page explains how William Huang (USATT# 279401)'s rating went from 1991 to 1980 at the MDTTC Saturday League event from 13 Mar 2016. 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.