This page explains how Kenneth Ma (USATT# 217436)'s rating went from 161 to 112 at the Bay Area Butterfly Championships held on 11 Nov 2023 - 11 Nov 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.