This page explains how Umar Mbow (USATT# 281772)'s rating went from 1645 to 1619 at the UNTTC Summer Championships held on - 16 Sep 2012. 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.