This page explains how Bishop Duperret (USATT# 222901)'s rating went from 1589 to 1584 at the TT&M Friday Night Butterfly League event from 25 Mar 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.