This page explains how Bill Maguire (USATT# 19763)'s rating went from 1588 to 1580 at the Long Island Table Tennis Center - No Longer Open event from 22 Sep 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.