This page explains how John G. Chen (USATT# 198570)'s rating went from 2027 to 2020 at the Missouri Show-Me State Games Open held on 3 Jun 2023 - 3 Jun 2023. 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.