This page explains how Stanley Harn (USATT# 25840)'s rating went from 1630 to 1625 at the Chicago Land Area Singles League event from 11 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.