This page explains how Ray A. Arditi (USATT# 56137)'s rating went from 1743 to 1741 at the Pottsgrove TTC event from 28 May 2004. 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.