This page explains how Jeff Guttenberg (USATT# 270489)'s rating went from 1251 to 1238 at the Spttc Saturday Night League event from 9 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.