This page explains how Ayman Ibrahim (USATT# 96623)'s rating went from 817 to 815 at the Long Island's Woodbury Table Tennis League event from 14 Jul 2015. 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.