This page explains how Joe Pierotti (USATT# 16090)'s rating went from 1609 to 1599 at the AZ PTTC Monday event from 23 Jan 2012. 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.