This page explains how Danny Wan (USATT# 219179)'s rating went from 2020 to 2015 at the 2021 Washington D.C. Table Tennis Giant Round Robin held on 28 Aug 2021 - 29 Aug 2021. 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.