This page explains how Zaid Berrada (USATT# 86942)'s rating went from 1778 to 1765 at the Chicago Land Area Singles League event from 19 Mar 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.