This page explains how Paul Sierra (USATT# 57913)'s rating went from 1661 to 1658 at the LATTA Butterfly September Open 2022 held on 24 Sep 2022 - 24 Sep 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.