This page explains how Paul Dobrowolski (USATT# 33453)'s rating went from 1239 to 1269 at the December Open held on - 9 Dec 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.