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 "Unknown157"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "4Q3/2p2ppk/8/P1Pb3p/5q2/P2p1P2/6PP/3R2K1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Qd4+ 2. Kh1 Bb3 ( { Black can try: } 2... Qf2 3. Qb5 d2 4. Qd3+ Kh8 5. Qxd2 Qxd2 6. Rxd2 c6 { White wins with a large material advantage. } ) 3. Rg1 d2 4. h3 d1=Q 5. Rxd1 Qxd1+ 6. Kh2 { Black wins with a large material
advantage. } 0-1