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 "Kajcik"] [Black "Cenov"] [Result "1-0"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "8/2R4p/5p1k/4pB2/1r2p3/3rn3/1P2R1PP/1K6 w - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1. Rxe3 Rxe3 2. h4 { Tightening the noose. } 2... Re1+ { Delaying the inevitable. } 3. Ka2 Ra4+ 4. Kb3 Ra7 5. Rxa7 Re3+ 6. Kc4 Rc3+ 7. bxc3 e3 8. Rxh7# 1-0