Keep your temper in check, mate.

Chess great Magnus Carlsen , the reigning No. 1 who’s considered the “best to ever play the game” by many, according to Chess.com , acted like the worst sport when he lost to 19-year-old phenom Gukesh Dommaraju recently.

On Carlsen’s home turf of Norway no less.

Carlsen slammed the table with his fist, knocking over pieces. After shaking hands with the victor as both barely made eye contact, he raised his arms and yelled in frustration, “Oh, my God!”

Watch the moment here .

Dommaraju is the reigning world champion , so it’s not like Carlsen lost to a patzer .

But it still prompted a king-size hissy fit.

As of Tuesday morning, Carlsen, a five-time World Chess Champion, sat in third place in the Norway Chess tournament while Dommaraju o

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