This page explains how Mahadevan Arivazhakan (USATT# 97451)'s rating went from 578 to 571 at the WCTTA Saturday League event from 21 Nov 2015. 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.