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 "Unknown407"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r2q1rk1/ppp2ppp/2bb4/8/2BB4/2P2Q2/P1P2PPP/R3R1K1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Qg4 g6 2. Re6 fxe6 ( { Black can try: } 2... g5 3. Rh6 Qe7 4. Rxh7 Kxh7 5. Qh5+ Kg8 6. Qh8# ) 3. Qxe6+ Rf7 4. Qxf7# 1-0