This page explains how Dean Johnson (USATT# 63458)'s rating went from 1571 to 1570 at the 2009 Virginia JOOLA Open held on - 4 Oct 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.