This page explains how Andrei Ilnitskii (USATT# 216594)'s rating went from 1506 to 1506 at the Spttc Saturday Night League event from 9 Dec 2017. 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.