When ESEA was founded, the only game it supported was Counter-Strike 1.6. Although Counter-Strike had already solidified itself as one of the founders of esports, the growth since its infancy has been staggering. Through all iterations of Counter-Strike, Counter-Strike 1.6 has long been a fan favorite and will go down as one of the best games ever made, period.
more info: https://play.esea.net/index.php?s=news&d=comments&id=15037?r=1438206