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Subject: Re: Pawn hashing without Zobrist keys

Author: Gian-Carlo Pascutto

Date: 13:20:22 09/12/03

On September 12, 2003 at 16:19:11, Omid David Tabibi wrote:

>On September 12, 2003 at 14:13:55, Gerd Isenberg wrote:
>
>>Hi,
>>
>>i never used Zobrist keys for pawn hashing in IsiChess,
>>but 64-bit difference of white and black pawn-bitboards
>>modulus some odd tablesize.
>>
>>Not for speed reasons, but simply because i didn't knew
>>it better a few years ago.
>>
>>Recently i played with some modulus by fixed point
>>approximation methods to get rid of the slow 64-bit mod:
>
>Why do you need the modulus operation?

Because a pawnhash of 2^64 entries is rather large, and
you can't AND since that just means you cancel out part
of the board.

--
GCP

Re: Pawn hashing without Zobrist keys Omid David Tabibi 13:33:13 09/12/03
- Re: Pawn hashing without Zobrist keys Gian-Carlo Pascutto 13:34:48 09/12/03
  - Re: Pawn hashing without Zobrist keys Omid David Tabibi 13:39:33 09/12/03
    - Re: Pawn hashing without Zobrist keys Gerd Isenberg 13:49:09 09/12/03
      - Re: Pawn hashing without Zobrist keys Omid David Tabibi 13:53:44 09/12/03
        
        Re: Pawn hashing without Zobrist keys Gerd Isenberg 14:02:04 09/12/03
        
        Re: Pawn hashing without Zobrist keys Sune Fischer 01:48:48 09/13/03
        
        Re: Pawn hashing without Zobrist keys Gerd Isenberg 02:32:29 09/13/03
        
        Re: Pawn hashing without Zobrist keys Sune Fischer 02:48:16 09/13/03
        
        Re: Pawn hashing without Zobrist keys Omid David Tabibi 14:06:15 09/12/03
        
        Re: Pawn hashing without Zobrist keys Gerd Isenberg 14:29:57 09/12/03
        
        Re: Pawn hashing without Zobrist keys Gian-Carlo Pascutto 14:00:25 09/12/03
        
        Re: Pawn hashing without Zobrist keys Vincent Diepeveen 17:58:33 09/12/03
        
        Re: Pawn hashing without Zobrist keys Gerd Isenberg 00:06:21 09/13/03
        
        Re: Pawn hashing without Zobrist keys Uri Blass 02:25:36 09/13/03
        
        Re: Pawn hashing without Zobrist keys Gerd Isenberg 03:01:12 09/13/03
        
        Re: Pawn hashing without Zobrist keys Uri Blass 04:40:45 09/13/03
        
        Re: Pawn hashing without Zobrist keys Gerd Isenberg 05:55:54 09/13/03
        
        Re: Pawn hashing without Zobrist keys Omid David Tabibi 14:09:42 09/12/03
        
        Re: Pawn hashing without Zobrist keys Gian-Carlo Pascutto 14:13:14 09/12/03
        
        Re: Pawn hashing without Zobrist keys Dieter Buerssner 13:59:13 09/12/03
        
        Re: Pawn hashing without Zobrist keys Vincent Diepeveen 07:10:17 09/13/03
        
        Re: Pawn hashing without Zobrist keys Gerd Isenberg 08:22:39 09/13/03
        
        Re: Pawn hashing without Zobrist keys Vincent Diepeveen 16:43:33 09/13/03
        
        Re: Pawn hashing without Zobrist keys Gerd Isenberg 01:48:48 09/14/03
        
        Re: Pawn hashing without Zobrist keys Vincent Diepeveen 04:06:19 09/14/03
        
        Re: Pawn hashing without Zobrist keys Gerd Isenberg 06:19:18 09/14/03
        
        Re: Pawn hashing without Zobrist keys Vincent Diepeveen 06:45:19 09/14/03
        
        typo Vincent Diepeveen 04:09:34 09/14/03

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