All of IRL humanity VS Meruem

In HXH Meruem is obviously one of the quickest beings to adapt to any sort of game in existence. However, hes famously stumped by a game thats somewhat similar to Chess but with three levels of elevation, in a sense If Gungi and a Gungi master were capable of beating him, what games and game masters IRL could he probably stand little chance at beating?

Round one: Meruem has 3 days of practice and learning the game before fighting a master Round two: Meruem is game lusted and will play up to 1 month+ of the game with a master