This page explains how Rob Sharp (USATT# 21995)'s rating went from 1830 to 1766 at the Schaumburg Fall Open held on - 7 Nov 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.