This page explains how Guodong Chen (USATT# 278774)'s rating went from 1255 to 1247 at the Spttc Saturday Night League event from 2 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.