14 Aug 2021 - 15 Aug 2021
This page explains how Jerry Zhang (USATT# 223480)'s rating went from 1979 to 1980 at the 2021 HITTA Butterfly Fall Open held on 14 Aug 2021 - 15 Aug 2021. The links below take you to pages that describe various aspects of the ratings processor.
The ratings 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.