This page explains how Donna Jean Sakai (USATT# 8644)'s rating went from 1816 to 1815 at the Western Open on the JOOLA NA T held on - 22 Feb 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.