This page explains how Bowie G. Martin Sr. (USATT# 4123)'s rating went from 1685 to 1651 at the US Open held on 17 Dec 2019 - 21 Dec 2019. 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.