This page explains how Xiaofeng (frank Zhu (USATT# 27551)'s rating went from 1824 to 1823 at the 2024 Butterfly May Upside Down Tournament held on 4 May 2024 - 5 May 2024. 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.