This page explains how Olaf Westheider (USATT# 276615)'s rating went from 1134 to 1121 at the 2023 San Antonio Fall Open held on 30 Sep 2023 - 1 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.