This page explains how Kef Noorani (USATT# 217865)'s rating went from 535 to 531 at the WCTTA Saturday League event from 25 May 2019. 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.