This page explains how Ann-ping Shangguan (USATT# 97927)'s rating went from 2251 to 2233 at the LYTTC Friday Pro League event from 10 Jan 2020. 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.