This page explains how Arseni Mouchinski (USATT# 1150994)'s rating went from 1678 to 1661 at the LYTTC Friday Pro League event from 17 Jan 2020. 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.