This page explains how Joon Lee (USATT# 216874)'s rating went from 1609 to 1600 at the SpinBlock Monday Night League event from 20 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.