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 "1979.??.??"]
[Round "?"]
[White "Vochok"]
[Black "Kreslavsky"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "2kr2nr/1ppq2pp/p1pB4/8/6Q1/8/PP3PPP/RN1R2K1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Be7 Nxe7 ( { Black dare not try: } 1... Qxg4 2. Rxd8# ) 2. Rxd7 Rxd7 { White
wins with a large material advantage. } 1-0