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 "Unknown153"] [Result "1-0"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "2kr3r/3n1p2/b3p1pp/p2pP3/Pp1P1P2/1RbqBNN1/6PP/1QR3K1 w - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1. Rcxc3+ bxc3 2. Qc1 Nb6 3. Rxc3+ Kb7 4. Rxd3 Bxd3 { White wins with a large material advantage. } 1-0