This page explains how David Sakai (USATT# 9668)'s rating went from 2158 to 2152 at the 2013 Berkeley Open on JOOLA North America Tour held on - 8 Sep 2013. 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.