This page explains how Song Han Ngo (USATT# 219644)'s rating went from 1641 to 1640 at the Spttc Saturday Night League event from 29 May 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.