This page explains how Alejandro Lim (USATT# 88580)'s rating went from 1230 to 1240 at the 2013 Butterfly Atlanta Winter Open held on - 2 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.