Author: Eelco de Groot
Date: 19:09:41 12/04/99
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Steve: Do I understand correctly--for each static evaluation of a single position (leaf node, I guess), the program evaluates based on material and positional factors without regard to which side is on the move? Then, some programmers like to add a bonus for the side to move? Vincent: It's an heuristic that's true in 99% of the positions that my program searches obviously. If a position is bad then usual programs nullmove. If a program nullmoves then the other side has the move so gets the bonus. So the sword cuts on 2 sides. Where you can nullmove normally to prevent getting into a worse position, you now suddenly cannot as your opponent gets the bonus instead of you. Me: Now I have never done any chessprogramming, but it seems fairly straightforward to say that you only need to think about such a bonus if you are comparing positions with White to move and positions with Black to move, right? Intuitively something tells me that is not without dangers. Isn't that a lot like comparing apples and pears? Wouldn't it be a lot better if only even plies were evaluated if possible? A recent discussion between Ed and Christophe about the early Rebel comes to mind... That way you can focus much more on plans , weaknesses, etc. of your own. You could save a lot of time time that way! Of course you can't ignore the opponent regardless, but you could use a different evaluation for uneven plies, looking more for tactical threats for instance? That would be relatively safe to do as long as you have the initiative.. If this isn't possible because of nullmove, isn't that a weakness of normal nullmove? Vincent I understand you are working on something you call double nullmove and that you are going to publish in ICCA journal about it. Has this anything to do with these even/uneven effects. Has double nullmove replaced the bonus in Diep? I must confess nullmove is hardly my expertise, but maybe others can follow better if you have anything to say about this. Thanks for any comments, by anybody Eelco
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