This page explains how Rafi Hosein (USATT# 17893)'s rating went from 1861 to 1849 at the LYTTC Friday Pro League event from 5 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.