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 "Petersburg"] [Date "1914.??.??"] [Round "?"] [White "Tarrasch"] [Black "Nimzovich"] [Result "0-1"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "3r1rk1/p3qp1p/2bb2p1/2p5/3P4/1P6/PBQN1PPP/2R2RK1 b - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1... Bxh2+ 2. Kxh2 Qh4+ 3. Kg1 Bxg2 4. Kxg2 Qg4+ 5. Kh2 Rd5 6. f4 Rh5# 0-1