This page explains how Ray A. Robertson (USATT# 63884)'s rating went from 1516 to 1491 at the AZ PTTC Monday event from 5 Jan 2015. 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.