This page explains how Phong Nguyen (USATT# 98055)'s rating went from 2556 to 2544 at the 2017 Butterfly Southeastern Open held on 20 Oct 2017 - 22 Oct 2017. 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.