This page explains how John Olsen (USATT# 8825)'s rating went from 1785 to 1784 at the Club Joola September Open held on - 21 Sep 2008. 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.