This page explains how David Maisel (USATT# 76188)'s rating went from 1663 to 1661 at the GHTTC August 2013 Open held on - 11 Aug 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.