This page explains how Rafi Hosein (USATT# 17893)'s rating went from 1780 to 1780 at the Roslyn-Long Island Sports Center (LISC) League event from 21 Apr 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.