This page explains how Mahadevan Arivazhakan (USATT# 97451)'s rating went from 1827 to 1821 at the WCTTA Saturday League event from 25 Jan 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.