This page explains how Mark Shapiro (USATT# 61560)'s rating went from 1769 to 1722 at the Killerspin Arnold Challenge held on - 6 Mar 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.