This page explains how Ray A. Robertson (USATT# 63884)'s rating went from 1573 to 1529 at the Grand Canyon State Summer Games held on - 12 Jun 2011. 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.