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 "1975.??.??"]
[Round "?"]
[White "Romanishin"]
[Black "Savon"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/6kp/1P4p1/P1R5/5p2/8/2r1r1PP/3R1K2 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Rf2+ 2. Kg1 ( { White dare not try: } 2. Ke1 Rce2# ) 2... Rxg2+ 3. Kh1 Rxh2+ 4. Kg1 Rcg2+ 5. Kf1 f3 6. Rc7+ Kh6 7. b7 Rh1# 0-1