This page explains how Keltant Vin (USATT# 1180573)'s rating went from 549 to 540 at the GLTTC FRIDAY 730pm League event from 8 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.