This page explains how Italo Ivaldi (USATT# 1361)'s rating went from 1693 to 1639 at the 2007 Indiana Open held on - 9 Sep 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.