This page explains how John Salas (USATT# 43722)'s rating went from 1800 to 1795 at the 2009 Potomac Fall Open held on - 15 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.