This page explains how Dennis M. Spellman (USATT# 10185)'s rating went from 1664 to 1663 at the 9th Annual Holiday Classic held on - 18 Jan 2009. 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.