This page explains how Kef Noorani (USATT# 217865)'s rating went from 1438 to 1418 at the ICC - Advanced League event from 1 Feb 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.