Search found 658 matches

by Edmund
Sat Jul 12, 2008 5:54 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: O88 chess
Replies: 6
Views: 2669

Re: O88 chess

On http://chessprogramming.wikispaces.com/0x88 you get a brief introduction to the features of 0x88.

As well Bruce Moreland has dedicated a page to this subject:
http://web.archive.org/web/200707161118 ... g/0x88.htm
by Edmund
Fri Jun 13, 2008 4:46 pm
Forum: Computer Chess Club: General Topics
Topic: Win or draw?
Replies: 12
Views: 3242

Re: Win or draw?

[D]7k/8/pppppppp/8/PPPPPPPP/8/8/7K w - - 0 1

For this a5/d5 wins, but I think the other position is draw, because the black king can protect its pawns

[D]6k1/8/pppppppp/8/PPPPPPPP/8/8/6K1 w - - 0 1

d5 is also a win for white probably
by Edmund
Thu Jun 12, 2008 8:30 am
Forum: Computer Chess Club: General Topics
Topic: ROADRUNNER: World's Fastest Supercomputer
Replies: 47
Views: 9944

Re: ROADRUNNER: World's Fastest Supercomputer

I am sure the starting position is zugzwang, as just any move weakens the king safety.
by Edmund
Mon Jun 09, 2008 5:46 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Opening Books
Replies: 6
Views: 2377

Re: Opening Books

Saving all the lines has a lot of redundancy. It would be easier to convert all the games and only save positions in the opening book. With the position you can then either save a score for the position (depending on the number of times it appeared on board and the percentage of games the stm won) o...
by Edmund
Thu Jun 05, 2008 6:47 am
Forum: Computer Chess Club: General Topics
Topic: Mysterious behaviour in book lines explained ?
Replies: 12
Views: 2940

Re: Mysterious behaviour in book lines explained ?

I assume the ctg opening book format works like transposition tables. There is one entry per position indexed with a hash-key. Probably the hash-key would be longer than in normal tt due to the high risk of collisions in such a huge tt or it would even be unique. So if you change the entry - the inf...
by Edmund
Tue May 27, 2008 2:31 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: How to reduce the "bits" used in a magic number ca
Replies: 67
Views: 28829

Re: How to reduce the "bits" used in a magic numbe

Edmund I may have mis-understood your terminology. I measure the potential of finding a magic number by counting the first n number of occupancies that I can fit into half this number. So for B7 I get the first 527 of 1024 to fit into 512 for G2 I get 992 of 1024 into 512 for A1 I get 3500+ of 4096...
by Edmund
Mon May 26, 2008 7:30 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: How to reduce the "bits" used in a magic number ca
Replies: 67
Views: 28829

Re: How to reduce the "bits" used in a magic numbe

:D I'm starting to be a believer in the "don't just use random numbers" to find optimal magics strategy. I've had a program running for two days using random numbers with very few bits set looking for an 11-bit magic for square 0 (a1). It has tried 20,000,000,000 numbers. None of them has worked. :...
by Edmund
Mon May 26, 2008 11:39 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: How to reduce the "bits" used in a magic number ca
Replies: 67
Views: 28829

Re: How to reduce the "bits" used in a magic numbe

For B7 the results are not good. Best I can get is 527 index numbers used with 176 good collisions, though if I don't see any progress after about 5 minutes I get bored and try something else. You will have better success at the other end of the board. I have 9-bit magics for B2, C2 & D2, and goods...
by Edmund
Mon May 26, 2008 10:26 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: How to reduce the "bits" used in a magic number ca
Replies: 67
Views: 28829

Re: How to reduce the "bits" used in a magic numbe

grant wrote:Edmund

I'll have a look at B7 for you now.

Grant
great - any success so far?
by Edmund
Sun May 25, 2008 4:48 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: How to reduce the "bits" used in a magic number ca
Replies: 67
Views: 28829

Re: How to reduce the "bits" used in a magic numbe

Edmund I don't see any errors in my code. I have now checked and double checked again, and it works. B2 is square 49 for me, so maybe B7 for you. Could you check again? I have also found more 9-bit magic numbers for rooks so it would be nice to get this verified. Grant sorry, I was using a differen...