This page explains how Bin Hai Chu (USATT# 13020)'s rating went from 2264 to 2254 at the Butterfly 2021 September BTTC Open held on 24 Sep 2021 - 26 Sep 2021. 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.