This page explains how Ken Kwong (USATT# 60685)'s rating went from 1523 to 1521 at the Spttc Saturday Night League event from 28 Aug 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.