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 "Unknown405"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "5k2/2p3p1/1p1p1PK1/1P1Pp1P1/4n3/8/8/2B5 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Kh7 ( { White can try: } 1. Kf5 Nc3 2. Ke6 Nxb5 3. Kd7 gxf6 4. gxf6 Kf7 5. Kc6 Nc3 6. Kxc7 Nxd5+ 7. Kxd6 Nxf6 8. Kxe5 { Draw. } ) ( { White can also try: } 1. fxg7+ Kg8 2. Kf5 Nc3 3. Ke6 Nxb5 4. Kd7 { With a likely draw. } ) ( { White
dare not try: } 1. f7 Nc3 2. Kh7 Kxf7 3. g6+ Kf6 4. Bg5+ Kxg5 5. Kxg7 Nxd5 6. Kf7 e4 7. g7 Nf6 8. g8=Q+ Nxg8 9. Kxg8 e3 { Black wins with a large material
advantage. } ) 1... gxf6 2. g6 f5 3. g7+ Ke7 4. Kg6 Nf6 5. Bg5 e4 6. Bxf6+ Kd7 7. g8=Q c6 8. Qd8# 1-0