This page explains how Zefeng Chen (USATT# 98208)'s rating went from 2322 to 2321 at the Westchester December 2018 Open held on 29 Dec 2018 - 30 Dec 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.