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Subject: Re: A case when Movei earn 2 plies from verified null move pruning

Author: Uri Blass

Date: 04:32:48 11/23/02

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On November 23, 2002 at 07:19:11, Sune Fischer wrote:

>On November 23, 2002 at 06:15:27, Sune Fischer wrote:
>
>I let it run for a while longer, and it is beginning to see that black is still
>better.
>
>12	-4	1153	4256456		1.h3 Re6 2.Rd1 Kg6 3.Rc1 Rd6 4.Rd1 Kh5 5.Rd2 Kh4 6.Kg2 Rb6
>12	-3	1546	5745396		1.Rg2
>12	0	1743	6498785		1.Kf2 Rb3 2.Ke1
>13	0	4216	15612657	1.Kf2 Rb3 2.Kf3 Rc6
>14	0	11847	43569716	1.Kf2 Rb3 2.Kf3 Kg6 3.Kf3
>15	-117	45093	164076936	1.Kf2 Ke6 2.e4 fxe4 3.Ke3 Kf5 4.Rg2 Rg6 5.Rd2 Rh6 6.Kd4
>Kxf4 7.Rf2+ Kg4 8.Kxe4
>15	-20	78304	282572280	1.e4 fxe4+ 2.Kxe4 Re6+ 3.Kd4 Re2 4.Kc3 Re4 5.Kxd2
>16	-43	250397	906614585	1.e4 fxe4+ 2.Kxe4 Re6+ 3.Kf3 Re1 4.Rg2 h6 5.Rg8 Rb6
>
>It will take all day to get a convincing winning score I think.
>
>Interesting that Movei finds them in reverse order, this win looks deeper.
>
>-S.

Movei finds advantage for positional reasons and not for tactical reasons.

I do not know about what reverse order you are talking.

Black seems to be better but the problem is to find the combination Rxb2

Movei without verification of null move pruning needs 14 plies and I posted it's
move before it finds that Rxb2 is winning.

Uri

Uri



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