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Subject: Re: Game 2, IBM Kasparov vs. Deep Blue, move 36.axb5

Author: Uri Blass

Date: 14:23:43 03/08/06

Go up one level in this thread


On March 08, 2006 at 16:55:48, Geo Disher wrote:

>You may be wrong about Qb6 being the best move.  Rybka finds axb5 as best also
>after 17 hours of eval.
>
>New game
>r1r1q1k1/6p1/p2b1p1p/1p1PpP2/PPp5/2P4P/R1B2QP1/R5K1 w - - 0 1
>
>Analysis by Rybka 1.0 Beta 32-bit:
>
>1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5
>  +-  (1.57)   Depth: 4   00:00:00
>1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5
>  +-  (1.57)   Depth: 4   00:00:00
>1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5
>  +-  (1.82)   Depth: 5   00:00:00
>1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5
>  +-  (2.06)   Depth: 6   00:00:00  5kN
>1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5
>  +-  (1.73)   Depth: 7   00:00:00  10kN
>1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5
>  +-  (1.83)   Depth: 8   00:00:00  13kN
>1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5
>  +-  (1.73)   Depth: 9   00:00:00  17kN
>1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5
>  +-  (1.95)   Depth: 10   00:00:00  37kN
>1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5
>  +-  (1.86)   Depth: 11   00:00:01  44kN
>1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5
>  +-  (1.77)   Depth: 12   00:00:02  116kN
>1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5
>  +-  (1.68)   Depth: 13   00:00:03  199kN
>1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5
>  +-  (1.65)   Depth: 14   00:00:04  298kN
>1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5
>  +-  (1.63)   Depth: 15   00:00:05  450kN
>1.Qb6 Qe7 2.axb5 Rab8 3.Qxa6 e4 4.Qa7 Qe5 5.Qe3 Re8
>  +-  (1.65)   Depth: 16   00:00:10  1369kN
>1.Qb6 Qe7 2.axb5 Rab8 3.Qxa6 e4 4.Qa7 Qe5 5.Qe3 Re8
>  +-  (1.65)   Depth: 17   00:00:46  5181kN
>1.Qb6 Qe7 2.axb5 Rab8 3.Qxa6 e4 4.Qa7 Qe5 5.Qe3 Re8
>  +-  (1.55)   Depth: 18   00:01:54  12780kN
>1.Qb6 Qe7 2.axb5 Rab8 3.Qxa6 e4 4.Qa7 Qe5 5.Qe3 Re8
>  +-  (1.75)   Depth: 19   00:03:47  26970kN
>1.Qb6 Qe7 2.axb5 Rab8 3.Qxa6 e4 4.Qa7 Qe5 5.Qe3 Re8
>  +-  (1.70)   Depth: 20   00:06:27  46469kN
>1.Qb6 Qe7 2.axb5 Rab8 3.Qxa6 e4 4.Qa7 Qe5 5.Qe3 Re8
>  +-  (1.59)   Depth: 21   00:12:58  89868kN
>1.Qb6 Qe7 2.axb5 Rab8 3.Qxa6 e4 4.Qa7 Qe5 5.Qe3 Re8
>  +-  (1.53)   Depth: 22   00:32:35  215285kN
>1.Qb6 Qe7 2.axb5 Rab8 3.Qxa6
>  ±  (1.39)   Depth: 23   01:11:34  454452kN
>1.Qb6 Qe7 2.axb5
>  +-  (1.52)   Depth: 24   02:27:32  937211kN
>1.Qb6 Qe7
>  ±  (1.26)   Depth: 25   07:55:22  2876850kN
>1.axb5 axb5
>  ±  (1.28)   Depth: 25   17:10:17  2876850kN
>
>(,  08.03.2006)

This version is an old rybka version and the difference is only 0.02 pawns so it
may change it's mind later.

I read in the following post that Rybka does not choose axb5 after 24 hours so I
guess that better rybka was used

http://www.talkchess.com/forums/1/message.html?491170

Uri



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