Author: James Swafford

Date: 20:26:08 08/16/02

I'm in the process of tracking down some hashing problems, and I'm starting with my Zobrist keys. For each piece (i.e. bp, wp, wr, ...) I have 64 keys. I have 65 keys for "ep square", two for "player to move", 16 for castling rights. All keys are 64 bits. I just did a test to find the minimum hamming distance among all keys, and it was 14 bits. That seems a bit low. I think the way I'm doing 64 bit random number generation sucks. Here it is: Bitmap RandomBitmap(void) { Bitmap r1,r2; r1=Random32(); r2=Random32(); return ((r1<<32)|r2); } Ok, someone please confirm that this sucks and tell me a better way. :) I'm also interested in hearing what others are getting for min hamming distance between keys. -- James

- Re: Random keys and hamming distance
**Vincent Diepeveen***07:03:27 08/17/02* - Re: Random keys and hamming distance
**Gerd Isenberg***04:04:18 08/17/02*- Re: Random keys and hamming distance
**Will Singleton***14:01:17 08/17/02*- Re: Random keys and hamming distance
**Dieter Buerssner***14:18:19 08/17/02*- Re: Random keys and hamming distance
**Vincent Diepeveen***20:11:36 08/17/02*

- Re: Random keys and hamming distance

- Re: Random keys and hamming distance

- Re: Random keys and hamming distance
- Re: Random keys and hamming distance
**Alessandro Damiani***03:48:24 08/17/02* - Re: Random keys and hamming distance
**Andrew Williams***03:35:16 08/17/02*- Re: Random keys and hamming distance
**Dieter Buerssner***14:41:52 08/17/02*- Re: Random keys and hamming distance
**Robert Hyatt***20:12:59 08/18/02* - Re: Random keys and hamming distance
**Andrew Williams***15:17:08 08/17/02* - Re: Random keys and hamming distance
**Dieter Buerssner***15:08:03 08/17/02*

- Re: Random keys and hamming distance

- Re: Random keys and hamming distance
- Re: Random keys and hamming distance
**Steve Maughan***00:57:50 08/17/02* - Re: Random keys and hamming distance
**Will Singleton***21:51:59 08/16/02*- Re: Random keys and hamming distance
**Dieter Buerssner***14:29:58 08/17/02* - Re: Random keys and hamming distance
**Daniel Clausen***00:38:04 08/17/02*- Re: Random keys and hamming distance
**Dieter Buerssner***13:52:14 08/17/02*

- Re: Random keys and hamming distance
- Re: Random keys and hamming distance
**Gian-Carlo Pascutto***00:20:19 08/17/02*- Re: Random keys and hamming distance
**Ron Murawski***07:03:30 08/17/02*- Re: Random keys and hamming distance
**Gian-Carlo Pascutto***01:41:48 08/18/02*- Re: Random keys and hamming distance
**Ron Murawski***06:59:23 08/18/02*

- Re: Random keys and hamming distance

- Re: Random keys and hamming distance
- Re: Random keys and hamming distance
**Sune Fischer***01:08:02 08/17/02*

- Re: Random keys and hamming distance
- Re: Random keys and hamming distance
**Russell Reagan***22:05:30 08/16/02*- Re: Random keys and hamming distance
**Ricardo Gibert***00:29:02 08/17/02*- Re: Random keys and hamming distance
**Russell Reagan***06:23:55 08/17/02*

- Re: Random keys and hamming distance

- Re: Random keys and hamming distance

- Re: Random keys and hamming distance
- Re: Random keys and hamming distance
**Russell Reagan***20:48:19 08/16/02*- Re: Random keys and hamming distance
**Uri Blass***22:11:13 08/16/02*- Re: Random keys and hamming distance
**Russell Reagan***22:16:05 08/16/02*- Re: Random keys and hamming distance
**James Swafford***06:20:38 08/17/02* - Re: Random keys and hamming distance
**Uri Blass***22:34:19 08/16/02*

- Re: Random keys and hamming distance

- Re: Random keys and hamming distance

- Re: Random keys and hamming distance

This page took 0.08 seconds to execute

Last modified: Thu, 07 Jul 11 08:48:38 -0700

Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.