This page explains how Alexandr Kaplan (USATT# 98180)'s rating went from 1984 to 1972 at the Spttc Wednesday night league event from 25 Sep 2019. 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.