This page explains how Kraig Murray (USATT# 221332)'s rating went from 1580 to 1579 at the AZ PTTC Monday event from 22 Feb 2021. 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.