This page explains how Santiago Alejandro Acosta (USATT# 218921)'s rating went from 1639 to 1872 at the HI Friday event from 16 May 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.