This page explains how Andrei Zanko (USATT# 203165)'s rating went from 1639 to 1639 at the Roslyn-Long Island Sports Center (LISC) League event from 5 May 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.