This page explains how David DeMay (USATT# 16850)'s rating went from 1591 to 1559 at the 2013 Cary Cup Championship held on - 17 Mar 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.