This page explains how Karl Rosenberg (USATT# 81893)'s rating went from 2041 to 2031 at the $3000 Nittakau Ohio Open held on 29 Jan 2021 - 30 Jan 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.