This page explains how Ann-ping Shangguan (USATT# 97927)'s rating went from 2241 to 2159 at the LYTTC Friday Pro League event from 28 Feb 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.