This page explains how Marc Villanueva (USATT# 28463)'s rating went from 1851 to 1816 at the Chicago Land Area Singles League event from 3 Jun 2013. 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.