This page explains how Bill Ukapatayasakul (USATT# 10729)'s rating went from 1911 to 1835 at the US Nationals held on 14 Dec 2015 - 18 Dec 2015. 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.