This page explains how Alex Sumeri (USATT# 52673)'s rating went from 1630 to 1628 at the 20th Bob Viducich Stiga Pacifi held on - 2 Nov 2008. 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.