This page explains how Nathaniel Dilworth (USATT# 1131686)'s rating went from 1516 to 1503 at the GEWO 2021 San Antonio Halloween Giant RR held on 16 Oct 2021 - 17 Oct 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.