This page explains how Olaf Westheider (USATT# 276615)'s rating went from 1102 to 1065 at the USATT 90th Anniversary - 2023 Alamo City Open held on 17 Jun 2023 - 18 Jun 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.