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Subject: Re: Positional/Real Sacrifice

Author: blass uri

Date: 00:16:16 12/02/99

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On November 30, 1999 at 17:26:58, Daniel Clausen wrote:

>Hi
>
>On November 29, 1999 at 15:11:39, Robert Hyatt wrote:
>
>>>>r3q1k1/ppp1rpp1/2n1b2p/8/2P2B2/3B4/PPPQ1RPP/5RK1 w - -
>>>>
>
>>This looks _incredibly_ dangerous.  For every position where Bxh6 works,
>>there are 10 positions where Bxh6 loses.  Here a piece for two pawns looks
>>awful if the other pieces can't get over to help out...  Speculative play is
>>nice, as in the old days of the Novag gadgets from Kittinger, and in the current
>>play of CSTal...  but it can backfire big-time as well...
>>
>>Crafty doesn't like the sac, unless it sees actual material coming back, because
>>I have spent a lot of time teaching it which types of material imbalance are
>>bad and which types are good.  A piece for 2 pawns is always bad unless there
>>is some tactical conclusion at the end.  And given the above PV there obviously
>>isn't anything except a somewhat naked king position for black...
>
>I agree with you that such moves can backfire, but I'm still confused. As far
>I know your intention is to make a strong program against humans. (Beating other
>computers has a much lower priority) But aren't moves like Bxh6 extremely good
>against humans? If there's really a way to defend for Black, it's more likely
>that
>a computer will find it, whereas a human (even if it's a GM) has so many ways
>to make one wrong move and most prolly will choose one of them.
>
>I kind of reminds me of the game DB-Kasparov where DB made the known knight
>sacrifice on e6. (not 100% sure now) For a human it's more or less hopeless to
>continue there, the only chance is that the opponent is also a tactical monster
>which is able to find the one and only way out. Just curious.

Strong humans can defend the position of DB-Kasparov against top programs.
I belive that kasparov lost the game because of 2 reasons:

1)kasparov was not prepared for the Nxe6 line and did a mistake before it when
he changed the order of moves.

2)deeper blue is better than the top programs.

Uri



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