This page explains how Lanfei Chen (USATT# 197032)'s rating went from 1487 to 1539 at the Westchester April 2018 Open held on 28 Apr 2018 - 29 Apr 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.