This page explains how Julian Morris (USATT# 1166957)'s rating went from 1166 to 1154 at the Westchester 2021 September Open held on 25 Sep 2021 - 26 Sep 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.