This page explains how Joe Pierotti (USATT# 16090)'s rating went from 1676 to 1640 at the Grand Canyon State Winter Game held on - 18 Mar 2007. 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.