This page explains how Kevin Nguyen (USATT# 221139)'s rating went from 1329 to 1157 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.