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A true sacrifice

A true sacrifice

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vivify
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Many sacs that I see on this forum aren't really sacs, in the sense that there's often an immediate benefit to giving up a piece, just a few moves later. Usually, a "sacrifice" posted on this forum, leads to mate or a queen fork shortly after. In short, nothing's really sacrificed.

I consider the sacrifice in this game (as black) to a true sacrifice, in that while I gain some ground positionally, I still have to play on and make decent moves.

Be fore warned: my opening moves were horrible.

c

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The sacrifices you made look very unsound. Simply 19.Qg3 (threatening havoc on g5), followed by Nc3 and White is winning pretty easily. Still, it was a nice way to come back from a lost game after the opening mistakes.

greenpawn34

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Hi Viv.

"In short, nothing's really sacrificed."

True, sacrifices are usually a means to an end, the object being to get back the
sacrificed material with a larger investment or checkmate.
The initial sacrifice kicks of the combination.

But your Knight sacrifice was really a blunder.
(unless you can prove it was all part of some huge 23 move combination.) 😉

vivify
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Originally posted by greenpawn34
Hi Viv.

"In short, nothing's really sacrificed."

True, sacrifices are usually a means to an end, the object being to get back the
sacrificed material with a larger investment or checkmate.
The initial sacrifice kicks of the combination.

But your Knight sacrifice was really a blunder.
(unless you can prove it was all part of some huge 23 move combination.) 😉
Yes, that was a pure blunder. My sacs were with the two bishops (move 15 and 17), not the knight. I even acknowlegded in the notes, that I shook my head at myself for falling for white's trap.

Trust me, I wouldn't pull an RJ and try to make a mistake seem like "psychology" or part of a master plan.

vivify
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Originally posted by chesskid001
The sacrifices you made look very unsound. Simply 19.Qg3 (threatening havoc on g5), followed by Nc3 and White is winning pretty easily. Still, it was a nice way to come back from a lost game after the opening mistakes.
Very true. Thanks for pointing that out.

S
Caninus Interruptus

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Sacrifice
a : destruction or surrender of something for the sake of something else

Nowhere does it say that the 'something else' can't have greater value than the something surrendered. Therefore, giving up a Rook for a pawn to force mate is still a sacrifice.

greenpawn34

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Hi Viv.

I've got it now.

The singular; "I consider the sacrifice in this game..."
Threw me, I thought it was the one sac, the Knight blunder/sac.

The other sacs are what is termed unclear sacrifices.
Practical counterplay sacs as opposed to clutching at straws sacs.

One could argue a True Sac is one that is sound in all variations.
But it's your game, your notes, your thoughts, so call them what you like
I won't argue with you.

An incredible amount of players both on here and OTB have lost a
game after picking up a Knight with that trick and simliar ones like it.
You would have to say the piece up player has totally relaxed and
is in game won mode.
(either that or a centre pawn is worth a lot more than a Knight.) 🙂

vivify
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Originally posted by SwissGambit
Sacrifice
a : destruction or surrender of something for the sake of something else

Nowhere does it say that the 'something else' can't have greater value than the something surrendered. Therefore, giving up a Rook for a pawn to force mate is still a sacrifice.
Good point.

vivify
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Originally posted by greenpawn34
One could argue a True Sac is one that is sound in all variations.
But it's your game, your notes, your thoughts, so call them what you like
I won't argue with you.
In light of Swiss Gambit's post, I have to take back what I said about a "true sacrifice". A sac, whether the reward is great or small, is still a sac.

c

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Originally posted by SwissGambit
Sacrifice
a : destruction or surrender of something for the sake of something else

Nowhere does it say that the 'something else' can't have greater value than the something surrendered. Therefore, giving up a Rook for a pawn to force mate is still a sacrifice.
So by that definition, would winning a Queen for a Knight count as a sacrifice? After all, you're "surrendering" a piece for something else, namely a piece worth three times as much.

C

EDMONTON ALBERTA

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The white queen did invade on the e-file... if there was a pawn there the checkmate may not have been possible. Yet this was due to inaccurate play from white. However, it does show how you can take advantage of a blunder... the e-pawn may be worth a knight down the road, so why not just whack it off the start! 😛

S
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Originally posted by chesskid001
So by that definition, would winning a Queen for a Knight count as a sacrifice? After all, you're "surrendering" a piece for something else, namely a piece worth three times as much.
In a chess context, 'sacrifice' generally refers to a deliberate loss of material. The definition allows your example to be a sacrifice, but the context does not.

C

EDMONTON ALBERTA

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I think the definition being used here is missing something. I always thought a sacrifice involved a tactical aspiration of some sort. I looked it up on Wikipedia and this is what it says: "In chess, a sacrifice is a move giving up a piece in the hopes of gaining tactical or positional compensation in other forms. A sacrifice could also be a deliberate exchange of a chess piece of higher value for an opponent's piece of lower value."

http://en.wikipedia.org/wiki/Sacrifice_%28chess%29

So according to this, taking a queen in exchange for a knight is not a sacrifice but taking a knight in exchange for a queen is.

It goes on to mention Real sacrifices (which is the type the OP calls a true sacrifice) and a sham sacrifice or pseudo sacrifice (where the player offering the sacrifice will soon regain material of the same or greater value, or else force mate.)...

greenpawn34

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The Wiki statement is close to what I mentioned.

.....sacrifices are usually a means to an end, the object being to get
back the sacrificed material with a larger investment or checkmate.

'usually' covers desperado sacs, or sacs for a stalemate etc...

I also said this:

"An incredible amount of players both on here and OTB have lost a
game after picking up a Knight with that trick and simliar ones like it."

🙂

Good to see viv is learning from his losses.
Viv picks up a whole Knight on move 7 and resigns 15 moves later.

(maybe we have stumbled upon the secret of Chess....
....lose a knight in the opening, it wins!!)

vivify -archangel666 RHP Nov 2012.


vivify
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Originally posted by greenpawn34
The Wiki statement is close to what I mentioned.

.....sacrifices are usually a means to an end, the object being to get
back the sacrificed material with a larger investment or checkmate.

'usually' covers desperado sacs, or sacs for a stalemate etc...

I also said this:

"An incredible amount of players both on here and OTB have lost a
game is Doomsday. Note White still has that extra Knight which we now know is a handicap.}[/pgn]
My pride forces me to inform you that I checkmated this same opponent just a day later:

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