This page explains how Nader Fahimi (USATT# 201540)'s rating went from 1884 to 1880 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.