Author: Jeremiah Penery
Date: 09:27:35 02/19/01
Go up one level in this thread
On February 19, 2001 at 04:20:51, Uri Blass wrote:
>On February 18, 2001 at 15:37:30, Jeremiah Penery wrote:
>
>>On February 18, 2001 at 03:40:35, Tanya Deborah wrote:
>>
>>>On February 18, 2001 at 03:03:43, Jeremiah Penery wrote:
>>>
>>>>On February 18, 2001 at 01:22:38, Tanya Deborah wrote:
>>>>>
>>>>>Hi to all,
>>>>>
>>>>>This is a beautiful game by the Great Master Leonid Stein.
>>>>>I am interested to know, How many programs can avoid the fatal mistake 21.Qxh1?
>>>>>
>>>>>Deep Fritz can avoid that!!!, Deep Fritz can see that Qxb3 is better than Qxh1.
>>>>> Junior6 and Hiarcs7.32 and Fritz6 can´t avoid that...
>>>>>
>>>>>The position is very interesting, in this kind of position you can see some
>>>>>computer weak points, (the machines sometimes have so much appetite, and can´t
>>>>>see the great atack by White after move 21.
>>>>>
>>>>>Another question? Which program can find 12.Qb3! ???? (with a winning endgame)
>>>>>- because after change Queens, White is much better. I think there are no
>>>>>program that can find this move.
>>
>>>>>[Event "Moscu, 1966 -Spartakiada"]
>>>>>[Date "1966.02.17"]
>>>>>[Round "?"]
>>>>>[White "Stein, Leonid"]
>>>>>[Black "Birbrager Isaak"]
>>>>>[Result "1-0"]
>>>>>[ECO "B10"]
>>>>>[PlyCount "43"]
>>>>>[EventDate "2001.02.17"]
>>>>>
>>>>>1. e4 c6 2. d3 d5 3. Nd2 dxe4 4. dxe4 Nf6 5. Ngf3 Bg4 6. h3 Bh5 7. e5 Nd5 8. e6
>>>>>f6 9. g4 Bg6 10. Nd4 Nc7 11. c3 Qd5 12. Qb3 12... Qxh1 $4 {A big mistake!,
>>>>>Black should have change Queens. (Dxb3). Now with this Rook sacrifice, White
>>>>>is winning! -(Stein.)}
>>>>> 13. Qxb7 13... Kd8 {
>>>>>A very dramatic and obligatory King move! - Black position is hopeless!} 14.
>>>>>N2f3 Bd3 15. Bf4 $1 {A very fine move!} 15... Qxf1+ 16. Kd2 Qxf2+ 17. Kxd3 {
>>>>>Black is lost
>>>>
>>>>The line of Crafty agreed with the analysis until here. I think white can only
>>>>get a draw after Nba6 instead of Nxe6 in this position.
>>>>[D]rn1k1b1r/pQn1p1pp/2p1Pp2/8/3N1BP1/2PK1N1P/PP3q2/R7 b - -
>>
>>>>What is the relevant line after 17. ...Nba6 for White to win?
>>>
>>>After Nba6 DEEP FRITZ see that White can win easy with :
>>>
>>>18. Bxc7+ Nxc7 19. Rd1 c5 20. Nb5 Nxe6 21. Qxa8+ Kd7 22. Kc4+ Nd4 23. Nbxd4 cxd4
>>>24. Nxd4 e5 25. Qxc6+ Ke7 26. Qe6+ Kd8 27. Nc6+ Kc7 28. Rd7+ Kb6 29. Nd4+ Ad6
>>>30. Qxd6 Ka5 31. Rxa7 MATE!! (DEEP FRITZ)
>>
>>Crafty did fail-low on Nba6 shortly after I posted the message - I just didn't
>>let it search long enough before I posted. However, I didn't let it search long
>>enough to resolve the fail-low, so I don't know what line it found. Thanks for
>>the analysis. :)
>
>I suspect that the singular extensions that you use are counter productive.
>
>I think that you should compare the time that Crafty need to find the right
>moves with singular extensions with the time that Crafty needs to find the right
>move without them.
I'm more interested in making Singular Extensions to work better in Crafty, but
I've had no time to tune them at all. Hopefully I should be able to minimize
the time loss but still keep most of the gains.
>Crafty need less plies with singular extensions but I suspect that it needs more
>time.
>Crafty18.01 under chessbase needed only 48 seconds to see 0.00 evaluation for
>Qxh1 on p800.
How many NPS does it see on that machine? I usually get only about 100-150KN/s
(with any version of Crafty). If you're getting, say, 500KN/s on that machine,
then it's probably about 4x as fast as mine.
>This Crafty has no problem to find Qb3 at tournament time control on fast
>hardware.
>I guess that singular extensions will make it slower in finding Qb3 and I am not
>sure if they make it faster in avoiding Qxh1.
I think if they're tuned properly, it should be faster for both things with SE.
At least in theory it should be... I'm not sure if I can make it work, but I
will try.
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