This page explains how Gun Naung Sumlut (USATT# 89835)'s rating went from 1010 to 981 at the ICC - Sunday Beginners League event from 27 Jun 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.