This page explains how Rafi Hosein (USATT# 17893)'s rating went from 1671 to 1670 at the Roslyn-Long Island Sports Center (LISC) League event from 15 Feb 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.