This page explains how Sarah Zhang (USATT# 1172448)'s rating went from 1990 to 1990 at the 2024 Butterfly Triangle Cup held on 21 Mar 2024 - 24 Mar 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.