This page explains how Changbo Lu (USATT# 202365)'s rating went from 1931 to 1969 at the Butterfly 2019 June BTTC Open Tournament held on 23 Jun 2019 - 23 Jun 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.