This page explains how George S. Aitken (USATT# 3797)'s rating went from 1647 to 1639 at the NJTTC Monday League event from 12 Dec 2005. 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.