This page explains how Kef Noorani (USATT# 217865)'s rating went from 2006 to 1977 at the 888 League event from 7 Nov 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.