This page explains how Minhua Zhu (USATT# 215008)'s rating went from 1639 to 1638 at the Swan Sunday League event from 9 Sep 2023. 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.