This page explains how Michael Shieh (USATT# 17295)'s rating went from 1924 to 1917 at the 2023 TT&M's Butterfly Madness held on 24 Mar 2023 - 26 Mar 2023. 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.