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 "White player"]
[Black "Black player"]
[Result "*"]
[BlackElo "0"]
[FEN "7k/4K1p1/4N1Pp/7P/8/8/8/8 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
{ Knight Moves.|White to move and win.|The Black king has found a strong
position.|Can White find a way to break through?|The immediate 1. Nxg7
Kxg7 does not lead any place White wants to go. Nor can White approach the
backward pawn with his king without forcing stalemate. } 1. Ng5 { There are in
fact many first moves that will bring the knight to f6 in a way that forces
black to capture it. This path is the most fun. Then white can support and
promote his g-pawn.|There are also many ways for white to go wrong. } ( { This alternative also wins: } 1. Nc5 Kg8 2. Nd7 Kh8 3. Nf6 gxf6 4. Kf7 f5 5. g7+ Kh7 6. g8=Q# ) ( { This alternative also wins: } 1. Nc7 Kg8 2. Ne8 Kh8 3. Nf6 gxf6 4. Kf7 f5 5. g7+ Kh7 6. g8=Q# ) ( { This alternative also wins: } 1. Nf8 Kg8 2. Nd7 Kh8 3. Nf6 gxf6 4. Kf7 f5 5. g7+ Kh7 6. g8=Q# ) ( { This
alternative does not get the job done: } 1. Nd4 Kg8 2. Nf5 Kh8 3. Nxh6 gxh6 4. Kf6 Kg8 5. g7 Kh7 6. Kf7 { Stalemate draw. } ) 1... Kg8 ( { The knight is immune: } 1... hxg5 2. Kf7 g4 3. h6 gxh6 4. g7+ Kh7 5. g8=Q# ) 2. Nh7 Kh8 3. Nf6 { With
perfect timing, the knight forces black to capture it. } 3... gxf6 4. Kf7 f5 5. g7+ Kh7 6. g8=Q# *