A few days ago, the Norwegian Magnus Carlsen has re-validated his title as world champion chess against Sergey Karjakin: after 12 conventional items had to be held for an extension to items semi-fast, and it was in that duel in which finally Carlsen managed to win against his rival.
These great teachers are among the best in the world, but neither they nor the former masters of the whole story could do much in that other world championship called Top Chess Engine Championship (TCEC) in humans even competing. It is reserved for machines, or rather, to chess engines that compete with each other and that would leave very bad place to any human player.