This page explains how James G. Spetsios (USATT# 10193)'s rating went from 1642 to 1638 at the March Winds Open Giant RR held on - 25 Mar 2006. 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.