This page explains how Alexey Porollo (USATT# 276685)'s rating went from 1152 to 1127 at the Butterfly S&S November Open held on 18 Nov 2023 - 19 Nov 2023. 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.