This page explains how Hugo Su (USATT# 13014)'s rating went from 1999 to 1987 at the Butterfly February 2018 BTTC Open held on 10 Feb 2018 - 11 Feb 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.