This page explains how Ayman Ibrahim (USATT# 96623)'s rating went from 1341 to 1331 at the Roslyn-Long Island Sports Center (LISC) League event from 7 Dec 2018. 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.