This page explains how Bowie G. Martin Jr. (USATT# 8087)'s rating went from 1978 to 1942 at the 2023 Butterfly May Upside Down Tournament held on 27 May 2023 - 28 May 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.