This page explains how David DeMay (USATT# 16850)'s rating went from 1571 to 1559 at the Butterfly Cary Cup Championship held on - 21 Mar 2010. 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.