A good sacrifice is one that is not necessarily sound but leaves your opponent dazed and confused.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown25"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "Q7/5pp1/1R1r2kp/8/8/7P/5PPK/3q4 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Qd8 Rxb6 2. Qxd1 { White wins with a large material advantage. } 1-0