This page explains how Aaron Oliver (USATT# 249948)'s rating went from 1653 to 1619 at the 2021 US National TT Championships Southeast Regional Qualifier held on 21 May 2021 - 23 May 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.