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by Daniel Shawul
Tue Mar 17, 2009 11:42 pm
Forum: Computer Chess Club: General Topics
Topic: New Scorpio bitbase files
Replies: 86
Views: 24489

Re: New Scorpio bitbase files

That is great Pedro! I guess that is one advantage of the reduced size which I didnt think of :oops: . I tried the old ones on a 1GB flash disk once and they seemed to be faster. Any speed increase there? I might be able to further comperss them down by using predictions which I have not taken advan...
by Daniel Shawul
Tue Mar 17, 2009 11:33 pm
Forum: Computer Chess Club: General Topics
Topic: New Scorpio bitbase files
Replies: 86
Views: 24489

Re: New Scorpio bitbase files

This is getting boring now. I was talking of this part of your egtb code which adjusts the draw score by +1 or -1 by looking at material only. Ofcourse when you do search you are going to use your eval() because you turnoff bitbase probes there. That has been discussed to death throught this discuss...
by Daniel Shawul
Tue Mar 17, 2009 2:48 pm
Forum: Computer Chess Club: General Topics
Topic: New Scorpio bitbase files
Replies: 86
Views: 24489

Re: New Scorpio bitbase files

However, in my _first_ post I explained that I cull the non-drawing moves. That's the way swindle mode has always worked. I cull them because I am not going to use egtb's to guide the search, because I _know_ that the egtb result is draw at best. But egtbs have no concept of drawing in the most dif...
by Daniel Shawul
Tue Mar 17, 2009 2:18 pm
Forum: Computer Chess Club: General Topics
Topic: New Scorpio bitbase files
Replies: 86
Views: 24489

Re: New Scorpio bitbase files

hello bernhard
I don't have linux so I can't check it myself. I will ask someone to make
a compile and see if they get the same reslult.

thanks
by Daniel Shawul
Tue Mar 17, 2009 2:15 pm
Forum: Computer Chess Club: General Topics
Topic: New Scorpio bitbase files
Replies: 86
Views: 24489

Re: New Scorpio bitbase files

That is how I understood it. For draws things are pretty easy. Your swindle mode infact is the simplest it only considers material to choose between different draws. For example it doesn't try to consider where the draw occurs. We can do that to choose immediate draws rather than those further from ...
by Daniel Shawul
Tue Mar 17, 2009 1:55 pm
Forum: Computer Chess Club: General Topics
Topic: New Scorpio bitbase files
Replies: 86
Views: 24489

Re: New Scorpio bitbase files

Not at all. How can you _possibly_ lose the game if you only consider bitbase verified winning moves? The problem is the draws due to the 50 move rule or repetition which the bitbases don't cover. All you need is an eval good enough to win such a "won position" once you actually reach it. You don't...
by Daniel Shawul
Tue Mar 17, 2009 2:02 am
Forum: Computer Chess Club: General Topics
Topic: New Scorpio bitbase files
Replies: 86
Views: 24489

Re: New Scorpio bitbase files

searching only winning moves means your bitbase-less search won't make a mistake at the root and convert the win to a draw or loss, while letting your normal search and evaluation make the progress. Right, so in those cases that a wrong root move is backed up(found out with the bitbase-less search)...
by Daniel Shawul
Tue Mar 17, 2009 1:36 am
Forum: Computer Chess Club: General Topics
Topic: New Scorpio bitbase files
Replies: 86
Views: 24489

Re: New Scorpio bitbase files

Swindle mode applies to draws, but it works for this case as well. If you reach a 5 piece position at the root, where the bitbase result is "won", then you generate all legal moves. You make each move and then probe the bitbase for the resulting position which should now say "lost" since you have f...
by Daniel Shawul
Mon Mar 16, 2009 9:45 pm
Forum: Computer Chess Club: General Topics
Topic: New Scorpio bitbase files
Replies: 86
Views: 24489

Re: New Scorpio bitbase files

5 pieces (or less) otb at the root position. Here any search that relies on bitbases is going to blunder a win into a draw. It won't lose of course, but going from a win to a draw by 50 move rule is bad enough. And here, searching the first 2/3 of the tree without bitbase probes gets you nothing, b...