This page explains how Wally Barber (USATT# 62880)'s rating went from 621 to 573 at the 2018 Arizona Sizzler Open held on 28 Jul 2018 - 29 Jul 2018. 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.