I’m pretty sure it was Magnus Carlsen as a child. I watched a video on it years ago.
I think Magnus was playing as black. He was positionally in a much worse place than his opponent.
After taking a while thinking, Magnus sacrificed his queen by going diagonally from c7 to h2 and taking the pawn in front of the rook. This sacrifice was insane, and completely flipped the game in his favour.
Does anyone know which game I am describing? I’d love to watch it in full