This page explains how Cory Johnson (USATT# 29085)'s rating went from 1834 to 1815 at the NJTTC September Open held on - 7 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.