World Chess Championship: How a rook-ie mistake cost Ding Liren the game, match and the crown
Here’s what that reckless rook withdrawal had done: in moving his rook from f4 to f2, Ding had offered it up to Gukesh for an exchange. Gukesh’s own rook, stationed on b2, would sweep in and capture it. Then Ding would recapture the piece with his own king. No harm done there.