This page explains how Hannah Song (USATT# 203187)'s rating went from 2130 to 2129 at the Butterfly Houston New Year Challenger held on 19 Feb 2022 - 19 Feb 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.