This page explains how Duane Millslagle (USATT# 60852)'s rating went from 1576 to 1575 at the 2023 Butterfly December Tournament held on 10 Dec 2023 - 10 Dec 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.