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Daniel Shawul
Joined: 14 Mar 2006
Posts: 2186
Location: Ethiopia
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 Post subject: Re: Zobrist alternative? Posted: Sat Jun 16, 2012 2:05 pm |
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No vincent. I refer to you the very first posts I made in the first page. I literally begged for attention since I thought addition is a fast and also preserving the uniform distribution which avoids hash table clustering...
| Code: |
key(piece,square) = key1[piece] + key2[square];
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Then normal zobrist
| Code: |
key(p1,sq1) ^ key(p2,sq2) ^ key(p3,sq3) ...
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Here is my "golden" post specially for you 
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From the available operations, those that sustain uniform distribution of bits are : add , sub , xor. The rest i.e mul, div,and,or all change the distribution in some way. So a hash table constructed with the latter operators will show some clustering unlike those that maintain uniform distribution. Why not mix the first group of operators (say add and xor ) to get a key like this : key = key1[piece] + key2[square] and then use xor to form the final key for the position. I am not sure if add and xor are "dependent" somehow so this may not work. For example, if I just used an add for all operations, then a position like : Bishop at d4 Pawn at c3 will be equivalent to Bishop at c3 and Pawn at d4... An xor for the final hash key will solve this problem, but I am not sure. Anyway I just wanted to clearly describe what the problem is ..
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| Subject |
Author |
Date/Time |
 Zobrist alternative? |
H.G.Muller |
Tue Jun 12, 2012 7:35 pm |
| Re: Zobrist alternative? |
Kevin Hearn |
Tue Jun 12, 2012 7:44 pm |
| Re: Zobrist alternative? |
Daniel Shawul |
Tue Jun 12, 2012 8:19 pm |
| Re: Zobrist alternative? |
H.G.Muller |
Tue Jun 12, 2012 8:54 pm |
| Re: Zobrist alternative? |
Daniel Shawul |
Tue Jun 12, 2012 9:46 pm |
| Re: Zobrist alternative? |
Daniel Shawul |
Wed Jun 13, 2012 3:24 am |
| Re: Zobrist alternative? |
Daniel Shawul |
Wed Jun 13, 2012 4:14 am |
| ignored idea here |
Daniel Shawul |
Wed Jun 13, 2012 4:00 pm |
| Re: ignored idea here |
Daniel Shawul |
Thu Jun 14, 2012 1:30 am |
| Re: ignored idea here |
H.G.Muller |
Thu Jun 14, 2012 5:50 am |
| Re: ignored idea here |
Daniel Shawul |
Thu Jun 14, 2012 12:52 pm |
| Re: ignored idea here |
Edmund Moshammer |
Thu Jun 14, 2012 8:21 am |
| Re: ignored idea here |
Edmund Moshammer |
Thu Jun 14, 2012 9:27 am |
| Re: Zobrist alternative? |
Wylie Garvin |
Tue Jun 12, 2012 8:27 pm |
| Re: Zobrist alternative? |
H.G.Muller |
Tue Jun 12, 2012 8:36 pm |
| Re: Zobrist alternative? |
Vincent Diepeveen |
Wed Jun 13, 2012 1:01 pm |
| Re: Zobrist alternative? |
Wylie Garvin |
Wed Jun 13, 2012 10:57 pm |
| Re: Zobrist alternative? |
H.G.Muller |
Thu Jun 14, 2012 5:42 am |
| Re: Zobrist alternative? |
Robert Hyatt |
Thu Jun 14, 2012 1:17 pm |
| Re: Zobrist alternative? |
H.G.Muller |
Thu Jun 14, 2012 2:17 pm |
| Re: Zobrist alternative? |
Wylie Garvin |
Thu Jun 14, 2012 6:11 pm |
| Re: Zobrist alternative? |
Vincent Diepeveen |
Sat Jun 16, 2012 10:05 am |
| Re: Zobrist alternative? |
Reinhard Scharnagl |
Wed Jun 13, 2012 9:52 am |
| Re: Zobrist alternative? |
Edmund Moshammer |
Wed Jun 13, 2012 9:58 am |
| Re: Zobrist alternative? |
Reinhard Scharnagl |
Wed Jun 13, 2012 12:49 pm |
| Re: Zobrist alternative? |
Edmund Moshammer |
Wed Jun 13, 2012 1:15 pm |
| Re: Zobrist alternative? |
Reinhard Scharnagl |
Wed Jun 13, 2012 1:41 pm |
| Re: Zobrist alternative? |
Edmund Moshammer |
Wed Jun 13, 2012 3:55 pm |
| Re: Zobrist alternative? |
Reinhard Scharnagl |
Wed Jun 13, 2012 4:03 pm |
| Re: Zobrist alternative? |
H.G.Muller |
Wed Jun 13, 2012 2:19 pm |
| Re: Zobrist alternative? |
Vincent Diepeveen |
Wed Jun 13, 2012 2:44 pm |
| Re: Zobrist alternative? |
Vincent Diepeveen |
Wed Jun 13, 2012 2:48 pm |
| Re: Zobrist alternative? |
Vincent Diepeveen |
Wed Jun 13, 2012 3:28 pm |
| Re: Zobrist alternative? |
H.G.Muller |
Wed Jun 13, 2012 4:01 pm |
| Re: Zobrist alternative? |
Vincent Diepeveen |
Wed Jun 13, 2012 5:42 pm |
| Re: Zobrist alternative? |
H.G.Muller |
Wed Jun 13, 2012 5:51 pm |
| Re: Zobrist alternative? |
Vincent Diepeveen |
Wed Jun 13, 2012 6:27 pm |
| Re: Zobrist alternative? |
Daniel Shawul |
Wed Jun 13, 2012 5:29 pm |
| Re: Zobrist alternative? |
Karlo Bala Jr. |
Thu Jun 14, 2012 9:50 am |
| Re: Zobrist alternative? |
Reinhard Scharnagl |
Thu Jun 14, 2012 8:49 am |
| Re: Zobrist alternative? |
H.G.Muller |
Thu Jun 14, 2012 9:09 am |
| Re: Zobrist alternative? |
Daniel Shawul |
Thu Jun 14, 2012 1:11 pm |
| Re: Zobrist alternative? |
Vincent Diepeveen |
Sat Jun 16, 2012 10:12 am |
| Re: Zobrist alternative? |
Don Dailey |
Thu Jun 14, 2012 4:46 pm |
| Re: Zobrist alternative? |
Don Dailey |
Thu Jun 14, 2012 6:38 pm |
| Re: Zobrist alternative? |
Daniel Shawul |
Thu Jun 14, 2012 6:57 pm |
| Re: Zobrist alternative? |
Don Dailey |
Fri Jun 15, 2012 2:39 pm |
| Re: Zobrist alternative? |
H.G.Muller |
Fri Jun 15, 2012 3:46 pm |
| Re: Zobrist alternative? |
Daniel Shawul |
Fri Jun 15, 2012 5:22 pm |
| Re: Zobrist alternative? |
H.G.Muller |
Fri Jun 15, 2012 5:38 pm |
| Re: Zobrist alternative? |
Vincent Diepeveen |
Sat Jun 16, 2012 10:17 am |
| Re: Zobrist alternative? |
Daniel Shawul |
Fri Jun 15, 2012 5:04 pm |
| Re: Zobrist alternative? |
Don Dailey |
Fri Jun 15, 2012 6:00 pm |
| Re: Zobrist alternative? |
Daniel Shawul |
Fri Jun 15, 2012 7:27 pm |
| Re: Zobrist alternative? |
Don Dailey |
Fri Jun 15, 2012 8:16 pm |
| Re: Zobrist alternative? |
Daniel Shawul |
Fri Jun 15, 2012 8:42 pm |
| Re: Zobrist alternative? |
Daniel Shawul |
Fri Jun 15, 2012 9:14 pm |
| Re: Zobrist alternative? |
Don Dailey |
Fri Jun 15, 2012 10:59 pm |
| Re: Zobrist alternative? |
Daniel Shawul |
Sat Jun 16, 2012 12:17 am |
| Re: Zobrist alternative? |
Don Dailey |
Sat Jun 16, 2012 4:28 am |
| Re: Zobrist alternative? |
Daniel Shawul |
Sat Jun 16, 2012 6:30 am |
| Re: Zobrist alternative? |
Daniel Shawul |
Sat Jun 16, 2012 10:09 am |
| Re: Zobrist alternative? |
Vincent Diepeveen |
Sat Jun 16, 2012 10:22 am |
| Re: Zobrist alternative? |
Vincent Diepeveen |
Sat Jun 16, 2012 10:42 am |
| Re: Zobrist alternative? |
Vincent Diepeveen |
Sat Jun 16, 2012 10:54 am |
| Re: Zobrist alternative? |
Daniel Shawul |
Sat Jun 16, 2012 11:03 am |
| Re: Zobrist alternative? |
Vincent Diepeveen |
Sat Jun 16, 2012 11:08 am |
| Re: Zobrist alternative? |
Don Dailey |
Sat Jun 16, 2012 12:03 pm |
| Re: Zobrist alternative? |
Vincent Diepeveen |
Sat Jun 16, 2012 12:55 pm |
| Re: Zobrist alternative? |
Vincent Diepeveen |
Sat Jun 16, 2012 2:21 pm |
| Re: Zobrist alternative? |
Daniel Shawul |
Sat Jun 16, 2012 2:25 pm |
| Re: Zobrist alternative? |
Vincent Diepeveen |
Sat Jun 16, 2012 2:44 pm |
| Re: Zobrist alternative? |
Daniel Shawul |
Sat Jun 16, 2012 12:35 pm |
| Re: Zobrist alternative? |
Vincent Diepeveen |
Sat Jun 16, 2012 1:11 pm |
| Re: Zobrist alternative? |
Vincent Diepeveen |
Sat Jun 16, 2012 1:15 pm |
| Re: Zobrist alternative? |
Vincent Diepeveen |
Sat Jun 16, 2012 1:56 pm |
| Re: Zobrist alternative? |
Daniel Shawul |
Sat Jun 16, 2012 2:05 pm |
| Re: Zobrist alternative? |
Vincent Diepeveen |
Sat Jun 16, 2012 2:10 pm |
| Re: Zobrist alternative? |
Daniel Shawul |
Sat Jun 16, 2012 2:22 pm |
| Re: Zobrist alternative? |
Vincent Diepeveen |
Sat Jun 16, 2012 2:29 pm |
| Re: Zobrist alternative? |
Daniel Shawul |
Sat Jun 16, 2012 2:35 pm |
| Re: Zobrist alternative? |
Vincent Diepeveen |
Sat Jun 16, 2012 2:39 pm |
| Re: Zobrist alternative? |
Don Dailey |
Sat Jun 16, 2012 3:49 pm |
| Re: Zobrist alternative? |
Daniel Shawul |
Sat Jun 16, 2012 4:35 pm |
| Re: Zobrist alternative? |
Daniel Shawul |
Sat Jun 16, 2012 2:11 pm |
| Re: Zobrist alternative? |
Vincent Diepeveen |
Sat Jun 16, 2012 2:13 pm |
| Re: Zobrist alternative? |
Vincent Diepeveen |
Sat Jun 16, 2012 2:19 pm |
| Re: Zobrist alternative? |
Daniel Shawul |
Sat Jun 16, 2012 2:29 pm |
| Re: Zobrist alternative? |
Vincent Diepeveen |
Sat Jun 16, 2012 2:32 pm |
| Re: Zobrist alternative? |
Daniel Shawul |
Sat Jun 16, 2012 4:19 pm |
| Re: Zobrist alternative? |
Don Dailey |
Sat Jun 16, 2012 4:50 pm |
| Re: Zobrist alternative? |
Daniel Shawul |
Sat Jun 16, 2012 4:25 pm |
| Re: Zobrist alternative? |
Don Dailey |
Fri Jun 15, 2012 8:21 pm |
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