This page explains how Bill Ukapatayasakul (USATT# 10729)'s rating went from 2016 to 1856 at the 2015 Arizona Open and Giant Round Robin held on - 22 Feb 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.