This page explains how Yong Long Zhen (USATT# 74869)'s rating went from 2191 to 2321 at the 888 TTC $15K Butterfly / XIOM Labor Day Challenge held on 3 Sep 2021 - 6 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.