This page explains how Mahadevan Arivazhakan (USATT# 97451)'s rating went from 1491 to 1490 at the WCTTA Saturday League event from 26 May 2018. 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.