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Subject: Re: Opening Book

Author: Inmann Werner

Date: 02:03:40 08/27/99

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On August 27, 1999 at 04:03:53, Scott Gasch wrote:

>
>Hi.
>
>I've implemented an opening book and now that it's done I have some questions ;)
>
>The book is stored on disk -- I hope to have it grow large enough one day that I
>don't want to spend the memory on it.  The problem is, though, that every book
>probe is a disk hit.  Therefore I don't want to do it too often in the search
>tree.  I am currently handling this by only probing book if the parent node was
>in book too.  The problem is, of course, that I don't get transpositions into
>known book positions from unknown ones this way.  Still, I think that
>performance wise it is not a good idea to probe book for, say, all moves before
>N in the game.  What do others do with this?
>
>Or do you read the book into memory in the first place and not worry about these
>problems. ;)
>
>Scott

I probe the book, until I three times get no hit. (why 3 times??)

Werner



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