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 "Unknown103"] [Result "1-0"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "1Rr1q2k/2P3pp/5b2/p1np4/8/PQ6/5PPP/2N3K1 w - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1. Rxc8 Qxc8 2. Qb8 h5 3. Qxc8+ Kh7 { White wins with a large material advantage. } 1-0