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 "Unknown307"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "5rk1/R4p2/3p2p1/7p/3NP2P/2pB1QP1/1r1q1P2/6K1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Bc4 Qxd4 2. Rxf7 Rxf7 ( { Black can try: } 2... Qxf2+ 3. Qxf2 Rxf2 4. Rxf2+ Kg7 5. Rc2 Rf3 6. Kg2 Re3 7. Kf2 Rxe4 8. Rxc3 { White wins with a large
material advantage. } ) 3. Qxf7+ Kh8 4. Qg8# 1-0