This page explains how Xianzhong Chen (USATT# 25249)'s rating went from 1900 to 1915 at the Westchester June 2019 held on 29 Jun 2019 - 30 Jun 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.