This page explains how Bill Ukapatayasakul (USATT# 10729)'s rating went from 1847 to 1863 at the California State Open held on - 21 Jun 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.