This page explains how Norvik Markari (USATT# 218021)'s rating went from 1989 to 2008 at the LATTA Butterfly Open October 2023 held on 28 Oct 2023 - 28 Oct 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.