This page explains how Bill Ukapatayasakul (USATT# 10729)'s rating went from 1821 to 1772 at the 2016 Butterfly LA Open Tournament held on 3 Sep 2016 - 4 Sep 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.