This page explains how Tom Ruan (USATT# 14167)'s rating went from 1995 to 1940 at the 2021 U.S. Open Table Tennis Championships held on 17 Dec 2021 - 22 Dec 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.