This page explains how Andrei Ilnitskii (USATT# 216594)'s rating went from 1622 to 1619 at the Spttc Wednesday night league event from 29 Jan 2020. 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.