This page explains how Alex Kotlyar (USATT# 21222)'s rating went from 1589 to 1577 at the SpinBlock December Open 2021 held on 18 Dec 2021 - 18 Dec 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.