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 "Unknown754"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "6r1/Rb1k1p2/1p2p3/4np2/2PP4/4Q3/2qN1PPP/5RK1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Rxg2+ ( { Black can try: } 1... Qxd2 2. Rxb7+ ( 2. Qxd2 Nf3+ 3. Kh1 Nxd2 4. Rd1 Ne4 5. Rb1 Kc6 6. f3 Nd6 7. c5 Nc8 { With a likely draw. } ) 2... Kc8 3. Ra7 Qxe3 4. fxe3 Nxc4 5. Ra8+ Kd7 6. Rxg8 { White wins with a large material
advantage. } ) 2. Kh1 Rxh2+ 3. Kxh2 Ng4+ 4. Kg1 Nxe3 5. fxe3 Qxd2 6. Rxb7+ Kc6 7. Rxf7 Qxe3+ 8. Rf2 Qxd4 { Black wins with a large material advantage. } 0-1