Author: Uri Blass
Date: 01:20:51 02/19/01
Go up one level in this thread
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.
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.
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.
Uri
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