This page explains how Patrick Sunman Wu (USATT# 60420)'s rating went from 2155 to 2124 at the ICC - Advanced League event from 15 Jun 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.