This page explains how Marc Villanueva (USATT# 28463)'s rating went from 1629 to 1582 at the Chicago Land Area Singles League event from 21 Dec 2010. 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.