15 May 2021 - 16 May 2021
This page explains how Bill Draper (USATT# 215512)'s rating went from 1287 to 1333 at the 2021 Butterfly May Upside Down Tournament held on 15 May 2021 - 16 May 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.