This page explains how Yi Ma (USATT# 84273)'s rating went from 1863 to 1801 at the ICC Joola Fall Open 2020 held on 10 Oct 2020 - 11 Oct 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.