This page explains how Mingyan Zhang (USATT# 219649)'s rating went from 1719 to 1664 at the Spttc Saturday Night League event from 30 Oct 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.