This page explains how Alan Petalver Almogela (USATT# 34198)'s rating went from 1518 to 1512 at the San Antonio Winter Open held on - 24 Feb 2013. 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.