This page explains how Kai Zarehbin (USATT# 91905)'s rating went from 2339 to 2319 at the ICC JOOLA Fall Open 2021 held on 28 Aug 2021 - 29 Aug 2021. 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.