Half the variations which are calculated in a tournament game turn out to be completely superfluous. Unfortunately, no one knows in advance which half.
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[Event "Carlsen Invitational"]
[Site "?"]
[Date "2020.??.??"]
[Round "?"]
[White "Liren, Ding"]
[Black "Nakamura, Hikaru"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "3rr2k/1p2q1bp/p5p1/3R1p2/1PQ5/P3B1P1/2R2PKP/8 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... b5 2. Qd3 ( { White can try: } 2. Qc6 Qe4+ 3. Kg1 Rxd5 4. Rd2 Rxd2 5. Qxe4 Rd1+ 6. Kg2 Rxe4 ) 2... Qb7 3. Rc5 Re5 4. f3 Rdxd5 5. Rxd5 Qxd5 6. Qxd5 Rxd5 { Black wins with a large material advantage. } 0-1