Author: Robert Hyatt
Date: 19:19:22 01/04/04
Go up one level in this thread
On January 04, 2004 at 13:39:37, Bob Durrett wrote: >On January 03, 2004 at 23:46:10, Robert Hyatt wrote: > >>On January 03, 2004 at 21:22:51, K. Burcham wrote: >> >>> >>> >>>I am not sure how this book learning works for each book move. >>>The value that is changed, is this only because of the loss? >>>Is the program using positional values once out of book to change the learned >>>value? >> >>Here is a thumbnail of what I do. >> >>1. Crafty remembers the evaluations for the first 10 moves out of book, >>after each search has been completed. It uses these evaluations to detect >>a "trend". IE is the evaluation good and getting better? Is it bad and >>getting worse? Is it good but dropping (ie it grabbed a gambit pawn and >>is beginning to see that it was bad) or is it bad but getting better (IE it >>offered a gambit, the opponent took it, and the score is going up). >> >>It factors all of that together and marks the book line as good or bad. >> >>2. Crafty takes the result of a game when it loses, and updates the book >>line so that moves tried near the end of the line simply don't get played, >>and alternatives near the front of the book line get tried next. >> >>There is more to it than that, and you can look at the crafty.doc file to >>at least see what I am doing in more detail. It is _very_ effective. >> >> >> >>>Lets say e4 is the most solid, dependable first move. >>>Lets say we lose 25 games with e4. >>>now we have a learned value for something. >>>Is this learned value only for e4? >>>Is this learned value only for the first move, regardlesss of the line played? >> >>For me, the entire line gets some "learning adjustment". The closer to the >>first move, the "smaller" the adjustment. >> >> >>> >>>If program A plays d4 against program B and wins 25 games. >>>If program A plays d4 against program C and loses 25 games. >>>If program C plays d4 against program B and loses 25 games. >>>I am not sure how this helps the high level book. >> >>The danger is that you are not learning about the "book", but about >>the "engines". That is a problem. Fortunately, it is not that common. >> >> >> >> >>> >>>Is all this learning for only the first book move? >> >>No. Crafty learns for _all_ moves along a line that was played. >> >>In fact, if you beat it with a line, you can expect to play against that >>line when you change colors and play it again. :) >> >> >> >>> >>>kburcham > >Bob H: > >I get the impression that the communication with the book, and it's modification >is done by a GUI [or UI]. Does this imply that you have modified somebody's GUI >[or UI]? > >Bob D. Nope. I have specific code in Crafty. IE LearnBook() which is called by the Crafty UI after each non-book move is played... And at the end of the game when the "result" is known.
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