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Subject: Re: problems with the branching factor of Crafty

Author: Slater Wold

Date: 10:05:54 09/28/01

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On September 28, 2001 at 12:55:04, Uri Blass wrote:

>New position
>[D]rnb2r1k/pp1p2pp/2p1P3/4p3/1qB3Q1/2N4P/P1P3P1/1RB4K b - - 0 1
>
>Analysis by Crafty 18.10:
>
>2...Qxc3 3.exd7 Nxd7
>  -+  (-8.27)   Depth: 1/11   00:00:00
>2...Qxc3 3.e7 Qe1+ 4.Kh2
>  -+  (-6.88)   Depth: 2/11   00:00:00
>2...Qxc3 3.e7 Re8 4.Bg5 Qxc2
>  -+  (-7.11)   Depth: 3/11   00:00:00
>2...Qxc3 3.e7 Re8 4.Bg5 Qxc2
>  -+  (-7.11)   Depth: 4/13   00:00:00
>2...Qxc3 3.e7 Qe1+ 4.Kh2 Re8 5.Qg5 d5
>  -+  (-7.24)   Depth: 5/13   00:00:00
>2...Qxc3 3.e7 Re8 4.Bg5 Qxc2 5.Rf1 d5
>  -+  (-7.32)   Depth: 6/17   00:00:00  97kN
>2...Qxc3 3.e7 Re8 4.Bb2 Qb4 5.Qxg7+ Kxg7 6.Bxe5+ Kg6 7.Rxb4 Rxe7
>  -+  (-6.81)   Depth: 7/19   00:00:01  257kN
>2...Qxc3 3.e7 Re8 4.Bb2 Qb4 5.Qxg7+ Kxg7 6.Bxe5+ Kg6 7.Rxb4 Rxe7 8.Bd3+ Kg5
>  -+  (-6.81)   Depth: 8/20   00:00:01  526kN
>2...Qxc3 3.e7 Re8 4.Bb2 Qb4 5.Qxg7+ Kxg7 6.Bxe5+ Kh6 7.Rxb4 Rxe7 8.Bf4+ Kg6
>9.Kh2
>  -+  (-6.69)   Depth: 9/23   00:00:03  1186kN
>2...Qxc3 3.Bb2 Qxc2 4.e7 Qxb1+ 5.Kh2 Re8 6.Qf3 h6 7.Qf8+ Rxf8 8.exf8Q+ Kh7
>9.Qg8+ Kg6 10.Bxe5 Qf5 11.Qxg7+
>  -+  (-6.57)   Depth: 10/25   00:00:09  3703kN
>2...Qxc3 3.e7 Re8 4.Bh6 gxh6 5.Rf1 Qa3 6.Rf7 Qc1+ 7.Bf1 Qg5 8.Rf8+ Kg7 9.Qxg5+
>hxg5 10.Rxe8 Kf6 11.Rxc8 Kxe7
>  -+  (-4.16)   Depth: 11/25   00:14:53  541954kN
>
>(Blass, Tel-aviv 28.09.2001)
>
>Uri

That is *obviously* wrong.  If Qxc3, it's an easy win for white.

Most programs I tested could see that.  I however did not test Crafty.


Slate



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