This page explains how Karolyn Vin (USATT# 1180572)'s rating went from 619 to 618 at the GLTTC FRIDAY 730pm League event from 28 Jul 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.