This page explains how Italo Ivaldi (USATT# 1361)'s rating went from 1609 to 1604 at the Highland Open held on - 18 Nov 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.