This page explains how Sean Masterson (USATT# 77070)'s rating went from 1638 to 1625 at the 2016 US Open held on 12 Dec 2016 - 17 Dec 2016. 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.