This page explains how Kevin Duong Au (USATT# 59475)'s rating went from 2228 to 2188 at the 2012 Berkeley Open on JOOLA North America Tour held on - 23 Sep 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.