This page explains how David Feerst (USATT# 77511)'s rating went from 1587 to 1520 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.