This page explains how Bob O'Rourke (USATT# 73165)'s rating went from 989 to 828 at the QTTC January Open held on - 31 Jan 2010. 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.