This page explains how Yuesong Jiang (USATT# 219321)'s rating went from 1489 to 1457 at the Westchester October 2019 Open held on 26 Oct 2019 - 27 Oct 2019. 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.