This page explains how Patrick Kin Luen Lui (USATT# 7924)'s rating went from 1901 to 1890 at the MDTTC Saturday League event from 13 Jul 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.