This page explains how Guillermo D. Vadell (USATT# 1173887)'s rating went from 1551 to 1537 at the Butterfly 2022 BTTC Fall Open Tournament held on 30 Sep 2022 - 2 Oct 2022. 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.