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

Author: Martin Giepmans

Date: 16:43:10 11/22/02

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On November 22, 2002 at 18:09:28, Uri Blass wrote:

>previous version found Rxb2 only at depth 14
>With verified null move pruning movei finds wac 2  at depth 12.
>
>[D]8/7p/5k2/5p2/p1p2P2/Pr1pPK2/1P1R3P/8 b - - 0 1
>
>depth=12 +0.64 b3b2
>Nodes: 6559172 NPS: 215975
>Time: 00:00:30.37
>
>depth=12 +2.67 b3b2 d2b2 c4c3 b2b6 f6g7 b6b7 g7h6 b7b6 h6h5 b6b5 c3c2 b5f5 h5g6
>f5g5 g6h6 g5c5 d3d2 c5c6 h6h5 c6c5 h5h4 c5c2 d2d1q c2e2
>Nodes: 17674291 NPS: 212303
>Time: 00:01:23.25
>
>depth=13 +3.54 b3b2 d2b2 c4c3 b2b6 f6g7 b6b7 g7h6 b7b6 h6h5 b6b5 c3c2 b5f5 h5g6
>f5g5 g6f6 g5c5 d3d2 c5c6 f6e7 c6c7 e7d6 c7c2 d2d1q c2e2 h7h5
>Nodes: 30679118 NPS: 220032
>Time: 00:02:19.43
>
>Uri

I don't think that pure nullmove (without any verification) is safe
in an endgame like this. So I'm not amazed that verified nullmove does better
here.

Martin

• Re: A case when Movei earn 2 plies from verified null move pruning Omid David Tabibi 16:55:23 11/22/02
  • Re: A case when Movei earn 2 plies from verified null move pruning Martin Giepmans 17:10:29 11/22/02
  • Re: A case when Movei earn 2 plies from verified null move pruning Uri Blass 17:03:41 11/22/02

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