This page explains how Sean Koster (USATT# 212045)'s rating went from 1722 to 1694 at the 2021 US National TT Championships Arizona State Qualifier held on 22 Mar 2021 - 24 Mar 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.