This page explains how Cameron Luo (USATT# 27961)'s rating went from 1680 to 1621 at the Kentuckiana League event from 18 Jun 2008. 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.