This page explains how Arseni Mouchinski (USATT# 1150994)'s rating went from 1580 to 1578 at the LYTTC Kam Man Cup Giant RR held on 20 Feb 2021 - 21 Feb 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.