This page explains how Lanfei Chen (USATT# 197032)'s rating went from 1821 to 1847 at the AACCT JAN 2020 Open/NYTTO held on 19 Jan 2020 - 19 Jan 2020. 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.