This page explains how John Schlegel (USATT# 16171)'s rating went from 1917 to 1915 at the 2023 Edgeball Chicago International Open held on 28 Oct 2023 - 29 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.