Author: Christophe Theron
Date: 16:01:57 11/17/99
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On November 17, 1999 at 18:00:33, Bella Freud wrote:
>On November 17, 1999 at 15:53:40, odell hall wrote:
>
>>Hi
>>
>>
>> Does anyone know any details about Chess Tiger?
>
>I have heard that it goes deeper. Deeper wins on the whole as you know.
>
>It is a fast program, so I would imagine the programmer has found a way to focus
>the search better with relation to the others.
It is not a fast program. It's more than twice as slow as Fritz.
>They are fighting for a narrow, specific part of the tree. Null move pruning by
>mostly material factors makes that.
No Chris, you don't get it. If you prune too much on material criterias you
completely destroy the positional skills of the program.
If I wanted to go deeper tactically, I could do it easily. I think I could go 2
plies deeper. But in this case my program would be completely crushed because of
incredible positional holes.
Before the game goes on a tactical field, my program would have a totally lost
position.
Each time I have tried to sacrifice the positional understanding to get deeper,
it was a disaster. I have found that it works in the opposite direction: with
better positional understanding the program goes deeper. Because it sees the
right moves earlier, and spends less time analyzing sonense moves.
You make it sound as if I had found a very specific way to shoot on a very
specific weakness of a very specific subset of chess programs.
You make it sound as if I was not programming chess.
You completely overlook the fact that several testers including our friend
Thorsten have noticed that Chess Tiger has a large amplitude in its evaluation
function. It's usual to see Tiger at +1.90 when the opponent is still close to
0.00.
>Getting an edge on this particular tree makes for good percentage increases in
>winning chances against other programs.
Maybe, and I would like to know how to do it. But as I don't tune my program
against other programs I unfortunately don't know how to do it.
Can you please explain how to do it? I would like to get a better rating on the
SSDF. If you know anti-computer tricks, please share them with me.
Christophe
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