This page explains how Allen Shen (USATT# 270203)'s rating went from 1648 to 1620 at the Spttc Saturday Night League event from 20 Nov 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.