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 "rated untimed match"]
[Site "Berlin"]
[Date "1954.??.??"]
[Round "?"]
[White "Teschner"]
[Black "Flad"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r1b2r1k/pp2bp1B/2p1pn1Q/6N1/8/8/PqP2PPP/3R1RK1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Rd8 Ne8 ( { Black can try: } 1... Bxd8 2. Qxf8+ Ng8 3. Qxg8# ) ( { Black can
also try: } 1... Ng8 2. Bxg8+ Kxg8 3. Qh7# ) ( { Black dare not try: } 1... Rxd8 2. Nxf7# ) 2. Bd3+ Kg8 3. Qh7# 1-0