This page explains how Kai Zhang (USATT# 86637)'s rating went from 2653 to 2644 at the Westchester April 2019 Open held on 27 Apr 2019 - 28 Apr 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.