This page explains how Joe Pierotti (USATT# 16090)'s rating went from 1519 to 1546 at the 2009 Winter Grand Canyon State held on - 29 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.