This page explains how Alex Kotlyar (USATT# 21222)'s rating went from 1629 to 1620 at the SpinBlock Monday Night League event from 19 Apr 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.