This page explains how Ann-ping Shangguan (USATT# 97927)'s rating went from 2111 to 2090 at the NJTTC Friday League event from 19 Oct 2018. 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.