This page explains how Andrei Ilnitskii (USATT# 216594)'s rating went from 1506 to 1450 at the Spttc Saturday Night League event from 27 Jan 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.