This page explains how Xudong Wu (USATT# 1168137)'s rating went from 1249 to 1240 at the Spttc Saturday Night League event from 18 Sep 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.