This page explains how Santiago Alejandro Acosta (USATT# 218921)'s rating went from 2191 to 2190 at the Westchester August 2020 Little Open held on 29 Aug 2020 - 30 Aug 2020. 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.