A good sacrifice is one that is not necessarily sound but leaves your opponent dazed and confused.
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[Event "Olympiad"]
[Site "Dubrovnik"]
[Date "1950.??.??"]
[Round "?"]
[White "Castaldi, Vincent"]
[Black "Reshevsky, Samuel"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r1bq1rk1/1p1nppbp/2n3p1/p7/QPPp4/B2P1NP1/P2N1PBP/R4RK1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... axb4 2. Qxa8 Nb6 3. Qxc8 Nxc8 4. Bc1 { Black wins with a large material
advantage. } 0-1