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 "Unknown312"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "b7/6pk/6rp/4p1q1/2N5/1P2P2P/4Q1P1/6RK b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Qh4 ( { Black can try: } 1... Qg3 2. e4 Qxb3 3. Nxe5 { With a likely
draw. } ) 2. Kh2 ( { White can try: } 2. e4 Bxe4 3. Qxe4 Qxe4 { Black wins with a
large material advantage. } ) 2... Qg3+ 3. Kh1 Qxh3# 0-1