This page explains how Alexandr Kaplan (USATT# 98180)'s rating went from 1959 to 1952 at the Spttc Saturday Night League event from 7 Jan 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.