This page explains how Sarah Zhang (USATT# 1172448)'s rating went from 1573 to 1577 at the 2022 Butterfly May Upside Down Tournament held on 21 May 2022 - 22 May 2022. 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.