This page explains how Jackie Feng (USATT# 70467)'s rating went from 1869 to 1934 at the Westchester September 2019 Open held on 28 Sep 2019 - 29 Sep 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.