This page explains how Andrei Ilnitskii (USATT# 216594)'s rating went from 1580 to 1599 at the Spttc Saturday Night League event from 15 Dec 2018. 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.