This page explains how David (WY) Chan (USATT# 81643)'s rating went from 1598 to 1574 at the 2011 JOOLA N. American Teams O held on - 27 Nov 2011. 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.