This page explains how Phong Nguyen (USATT# 78160)'s rating went from 2172 to 2164 at the 2019 Butterfly Ultimate Fieldhouse March Open held on 1 Mar 2019 - 3 Mar 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.