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 "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown006"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "Q7/8/6kp/P4p2/2p1pP2/2b1P3/6KP/2q5 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
{ White is down a piece, but black's king is exposed.|White's only hope for a
draw is to check the black king without mercy. } 1. Qg8+ ( { White can try: } 1. a6 Qd2+ 2. Kh1 Qe1+ 3. Kg2 Qe2+ 4. Kg1 Qxe3+ 5. Kf1 Qf3+ 6. Kg1 Bd4# ) 1... Bg7 2. Qe6+ Kh7 3. Qxf5+ Kg8 4. Qd5+ Kh8 5. Qa8+ Kh7 6. Qxe4+ Kg8 7. Qd5+ Kh7 8. Qe4+ Kh8 9. Qa8+ Kh7 10. Qe4+ { Despite being a piece up, black cannot shake
the checks. Draw. } 0-1