Author: Christophe Theron
Date: 18:36:59 08/28/00
Go up one level in this thread
On August 28, 2000 at 17:42:59, Uri Blass wrote:
>On August 28, 2000 at 14:15:57, Christophe Theron wrote:
>
><snipped>
>>So I think that no top program is a 100% root processor (not even 80% actually),
>>and I also believe that no top program is a 0% root processor.
>
>How can you calculate if it is 10%,20% or 30%?
Uri, I'm very sorry to use numbers in such an inaccurate way, but I don't know
how to describe it better.
A pity you can understand only mathematically sound sentences! :)
>I know that a program is more than 0% root processor if I see cases when the
>evaluation is changed not because of deeper search.
If you want to be picky about this, then let me give you one example:
a null mover can be in some positions absolutely unable to see a win. Just play
the right move and let it think for the opponent and it sees the problem
instantly. There was an unexpected zugzwang.
Problems in the search can produce such behaviours.
I know this is not what you meant. It's just to be mathematically sound. :)
This behaviour can also come from asymetry in the evaluation. It is the case
with Tiger for example (I have a little bit of asymetry for some evaluation
terms).
>Example:
>I remember cases when I analyzed a game with Genius3 and Genius gave me an
>advantage of 0.5 pawn.
>The program wanted to castle and expected castling from my opponent at all time
>controls.
>These moves were exactly the moves that were played in the game.
>
>After giving the moves to Genius3 it suddenly saw no advantage for me and not
>because of seeing deeper.
>
>When I see cases like this I know that the program does preprocessing.
>I know from my experience that i never saw things like this with chessmaster so
>it seems to me that chessmaster does not do preprocessing and if it does it is
>very small and does not change the evaluation by more than 0.1 pawn.
The problem is just to play the right moves most of the time. Not to be right
with the evaluation most of the time.
I understand what you mean, but if a little bit of preprocessing can improve the
search speed by 100%, that means an average elo improvement of 70 points. Being
accurate (more accurate) with the evaluation from move to move does not give as
much elo points.
You may disklike preprocessing, but you would much more dislike a tactically
weak program.
Christophe
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