This page explains how Marcus Miller (USATT# 70478)'s rating went from 1223 to 1219 at the JOOLA 2020 Safety First September Open Giant RR held on 26 Sep 2020 - 27 Sep 2020. 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.