This page explains how Santiago Alejandro Acosta (USATT# 218921)'s rating went from 2100 to 2139 at the Westchester 2018 February Open held on 24 Feb 2018 - 25 Feb 2018. 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.