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Subject: Re: difficult defence (testposition)

Author: Christopher A. Morgan

Date: 14:38:31 12/29/02

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John,

What settings do you use for CM9000?  Thanks.

Chris


On December 29, 2002 at 14:28:23, John Merlino wrote:

>On December 29, 2002 at 10:34:56, Thomas Lagershausen wrote:
>
>>[D]r2qr1k1/1p3p1p/p1b1pbpB/4N3/Pn1P4/6R1/1P2QPPP/1B1R2K1 b - - am Bxa4
>>
>>In a game Spasski-Pachman (Manila 1976) Pachman found the good defence Nb4-d5-e7
>>to bring a further defender to his king to protect the weak g6 square.
>>
>>Wrong is of course ...Bxa4 ?? after b3 nebst Qh5 and Lxg6 white´s attack is
>>decisive.Maybe an immediate is also decisive.
>>
>>Here are an example that this tasc of defence is not trivial.
>>
>>Two strong programs on paralell analysis on Athlon 1,5 Ghz under Arena-GUI:
>>
>>s: Yace 0.99.68  UCI 100 MB:
>>T1  00:00  -0,97   Lxe5 dxe5
>>T1  00:00  0,46   Lxa4
>>T2  00:00  0,45   Lxa4 b3
>>T3  00:00  0,58   Lxa4 b3 Lc6 Sxc6 Sxc6
>>T4  00:00  0,47   Lxa4 b3 Lc6 Tc3
>>T5  00:00  0,68   Lxa4 b3 Lb5 Dg4 Dd5
>>T6  00:00  0,60   Lxa4 b3 Lc6 Dg4 Dd5 Tc1
>>T7  00:01  0,62   Lxa4 b3 Lc6 Dg4 Dd6 Sxc6 Sxc6
>>T8  00:04  0,60   Lxa4 b3 Lc6 Dh5 De7 Tc1 Tac8 Dg4
>>T9  00:15  0,62   Lxa4 b3 Lc6 Dg4 Dd6 Sxc6 Sxc6 Le4 Tad8 d5
>>T10  02:16  0,48   Lxa4 b3 Lc6 Dh5 Te7 Sxf7 Txf7 Lxg6 hxg6 Dxg6 Lg7 Lxg7 Dd5
>>T11  04:54  0,51   Lxa4 b3 Lc6 Dh5 Dc7 Sxg6 fxg6 Lxg6 Te7 Lxh7 Kh8 Lg6 Tc8
>>T12-  05:39  0,11   Lxa4 b3 Lc6 Dh5 Dc7 Lxg6 fxg6 Sxg6 Lg7 Lxg7 Dxg3 hxg3 hxg6
>>T12  01:09:23  -0,14   Lxa4 b3 Lc6 Dh5 Te7 Sxf7 Txf7 Lxg6 Tc7 Lxh7 Kh8 Tg8 Dxg8
>>Lxg8 Txg8 Lg5 Kg7
>>T13-  01:11:03  -0,54   Lxa4 b3 Lc6 Dh5 Te7 Sxf7 Txf7 Lxg6 Tc7 Lxh7 Kh8 Tg8 Dxg8
>>Lxg8 Tac8 Lg5 Kg7
>>T13  01:18:54  -0,88   Lxa4 b3 Lc6 Dh5 Dc7 Lxg6 fxg6 Sxg6 hxg6 Txg6 Lg7 Txg7
>>Dxg7 Lxg7 Kxg7 De5 Kh6 Te1
>>T13+  01:28:30  -0,87   Dd5 Dh5 Te7 Sg4 Lxd4 Sf6 Lxf6 Txd5 exd5 Txg6 hxg6 Lxg6
>>T13  02:00:00  -0,16   Dd5 Dh5 Te7 b3 Tc7 Sg4 Le7 De5 Dxe5 dxe5 Tac8 Sf6 Lxf6
>>exf6 Sd5
>>
>>Aristarch 4.4  UCI 86 MB:
>>T2  00:00  0,21   Lxa4 b3
>>T3  00:00  0,36   Lxa4 b3 Lb5
>>T4  00:00  0,25   Lxa4 b3 Lb5 Dg4
>>T5  00:00  0,53   Lxa4 b3 Lb5 Dg4 Tc8
>>T6  00:00  0,31   Lxa4 b3 Lc6 Dg4 Tc8 Tc1
>>T7  00:00  0,37   Lxa4 b3 Lb5 Dg4 Lh4 Th3 g5
>>T8  00:01  0,30   Lxa4 b3 Lc6 Dg4 Ld5 h3 Tc8 Te1
>>T9  00:04  0,47   Lxa4 b3 Lb5 Dg4 Sc6 Lc2 Tc8 Le4 Sxd4
>>T10  00:08  0,45   Lxa4 b3 Lb5 Dh5 De7 Dg4 Sc6 Df4 Tad8 Lc2
>>T11  00:31  0,47   Lxa4 b3 Lb5 Dh5 Dc7 Le4 Tad8 Lf4 Lg7 Dg4 Tc8
>>T12  02:50  0,50   Lxa4 b3 Lc6
>>T13  10:46  0,37   Lxa4 b3
>>T14  26:40  0,07   Lxa4 b3 Lb5 Dh5
>>T15  01:29:04  -0,13   Lxa4 b3 Lc6
>>
>>So no result by Aristarch and a subperfect solution by Yace.
>>
>>What is the opinion of your favorite program?
>>
>>TL
>
>Chessmaster 9000, on a humble P3-733, still has not found Nd5 after almost 90
>minutes.
>
>However, in just over 2 minutes it found that Bxa4 was better for White (0.08),
>which appears at least to be better than the above two programs. In just under
>10 minutes it found that it was even better for White (0.73), and there was a
>huge fail-low which did not resolve after over 75 minutes!
>
>Time	Depth	Score	Positions	Moves
>0:00	1/3	0.05	1251		1...Bxa4 2.b3 Bb5 3.Qd2
>0:00	1/4	-0.64	4762		1...Bxa4 2.b3 Bb5 3.Qd2 Nd5
>0:00	1/5	-0.47	24503		1...Bxa4 2.b3 Bb5 3.Qd2 Nd5 4.Rc1
>0:01	1/6	-0.69	63668		1...Bxa4 2.b3 Bb5 3.Qd2 Nd5 4.Rc1
>					Qd6
>0:03	1/7	-0.69	140442		1...Bxa4 2.b3 Bb5 3.Qd2 Nd5 4.Rc1
>					Qd6
>0:06	1/8	-0.26	372786		1...Bxa4 2.b3 Bb5 3.Qh5 Qc7 4.Rc1
>					Qe7 5.Bg5 Nd5 6.Bxf6 Qxf6
>0:15	1/9	-0.26	1111867		1...Bxa4 2.b3 Bb5 3.Qh5 Qc7 4.Rc1
>					Qe7 5.Bg5 Nd5 6.Bxf6 Qxf6
>0:52	1/10	-0.09	4194171		1...Bxa4 2.b3 Bc6 3.Qh5 Qc7 4.Nxg6
>					fxg6 5.Bxg6 Kh8 6.Bxe8 Rxe8 7.Qg4
>2:19	2/11	0.08	11512758	1...Bxa4 2.b3 Bc6 3.Qg4 Qc7 4.Nxg6
>					fxg6 5.Bxg6 Kh8 6.Bxe8 Rxe8 7.Bf4
>					Qg7 8.Qe2
>9:54	3/12	0.73	50565289	1...Bxa4 2.Bxg6 fxg6 3.Nxg6 Qc7
>					4.b3 Bxb3 5.Ne5+ Kh8 6.Rxb3 Bxe5
>					7.dxe5 Nd5 8.Rg3
>1:25:23	3/12	0.52	334614650	1...Qc7 2.Bf4 Qd8 3.Qd2 Nd5 4.Nxc6
>					bxc6 5.Be5 Bxe5 6.dxe5 Qh4 7.Qc2
>					Qh5 8.Re1
>
>jm



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