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 "Unknown035"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "6k1/6p1/8/3qp3/1p2R3/5PPP/4Q2K/1r6 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Rd1 ( { Black can try: } 1... Qc5 2. Qa2+ b3 3. Qxb1 Qf2+ 4. Kh1 Qxf3+ 5. Kg1 Qxg3+ 6. Kf1 Qf3+ 7. Kg1 Qg3+ 8. Kf1 Qf3+ { Draw by repetition of
position. } ) ( { Black can also try: } 1... Qb3 2. Qc4+ Qxc4 3. Rxc4 b3 4. Rb4 b2 5. h4 Kf7 { With equal chances. } ) 2. Rxe5 Rd2 3. Rxd5 Rxe2+ 4. Kg1 b3 5. Rb5 b2 6. Kf1 Rc2 7. Ke1 Rc1+ 8. Kd2 b1=Q 9. Rxb1 Rxb1 { Black wins with a
large material advantage. } 0-1