This page explains how Santiago Echeverri (USATT# 222345)'s rating went from 1281 to 1291 at the 2021 HITTA Butterfly Fall Open held on 14 Aug 2021 - 15 Aug 2021. 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.