This page explains how Maggie Yan (USATT# 217205)'s rating went from 1830 to 1820 at the Spttc Saturday Night League event from 10 Jul 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.