This page explains how Fredrik Persson (USATT# 218929)'s rating went from 1933 to 1926 at the GLTTC FRIDAY 730pm League event from 15 Sep 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.