This page explains how Andrei Ilnitskii (USATT# 216594)'s rating went from 1629 to 1622 at the Spttc Wednesday night league event from 18 Dec 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.