This page explains how Xiang Chen (USATT# 224206)'s rating went from 1181 to 1220 at the Spttc Saturday Night League event from 23 Mar 2019. 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.