i found it:
https://www.youtube.com/watch?v=nqAOSdIkoNk&t=21s
Magnus Carlsen Queen Sacrifice against Anish Giri
at the end magnus builds a cage around king
Match where king is inside a box?
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So basically I once saw a video on youtube of a game where the king (in the image the white king) was like this:
(I don't remember if it was Magnus or someone else).
Can you please help me find this? It was beautiful to see that the opponent could do nothing to break into this "box"