This page explains how Chen Xu (USATT# 275290)'s rating went from 1229 to 1217 at the Spttc Saturday Night League event from 30 Dec 2023. 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.