This page explains how Shaoqing Luo (USATT# 275206)'s rating went from 450 to 420 at the Swan Sunday League event from 17 Sep 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.