This page explains how Chad Su (USATT# 86446)'s rating went from 1841 to 1864 at the 2015 U.S. Open held on - 11 Jul 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.