This page explains how Mark Shapiro (USATT# 61560)'s rating went from 1781 to 1768 at the John Jorgensen League event from 24 Nov 2003. 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.