This page explains how Chanh Nguyen (USATT# 214491)'s rating went from 1898 to 1875 at the OCTTA- SEPTEMBER OPEN held on 14 Sep 2019 - 14 Sep 2019. 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.