This page explains how Doug Wruck (USATT# 10604)'s rating went from 1648 to 1645 at the Rockford Christmas Open held on - 14 Dec 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.