This page explains how Zaid Berrada (USATT# 86942)'s rating went from 1799 to 1792 at the Chicago Land Area Singles League event from 25 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.