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 "Unknown171"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "1k1r4/pp2nbR1/2p1qp2/2p1p3/2P1P2r/P2P4/2PQBP1N/2K4R w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Bg4 f5 2. Qg5 Qh6 3. Qxh6 Rxh6 4. Rxf7 fxg4 5. Rxe7 Rdh8 6. Rg1 ( { Also,
good for white is: } 6. Rxe5 Rxh2 7. Rxh2 Rxh2 8. Rxc5 Rxf2 9. Rg5 Rg2 10. Kb2 g3 11. Kc3 { White will win this endgame. } ) 6... Rxh2 7. Rxg4 Rxf2 8. Rgg7 { White
wins with a large initiative advantage. } 1-0