This page explains how Alexandr Kaplan (USATT# 98180)'s rating went from 1910 to 1900 at the Spttc Saturday Night League event from 30 Mar 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.