Levon Aronian, the flamboyant Armenian-born grandmaster celebrated for his creative flair and daring sacrifices, faces Fabiano Caruana — the Italian-American prodigy who, that very same year, would challenge Carlsen for the world title in a historic match that ended 12 draws before Carlsen won on rapid tiebreaks. The London System provides the opening framework for what promises to be a battle between two of the planet’s elite players.