This page explains how Jho-Ju Tu (USATT# 211851)'s rating went from 1230 to 1221 at the US Nationals held on 2 Jul 2018 - 7 Jul 2018. 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.