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Subject: Re: Selectivity

Author: Uri Blass

Date: 10:57:14 01/14/01

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On January 14, 2001 at 13:12:38, Christophe Theron wrote:

>On January 14, 2001 at 00:33:56, Robert Hyatt wrote:
>
>>On January 13, 2001 at 23:58:41, Christophe Theron wrote:
>>
>>>On January 13, 2001 at 15:03:01, Uri Blass wrote:
>>>
>>>>On January 13, 2001 at 13:38:48, Christophe Theron wrote:
>>>>
>>>>>On January 13, 2001 at 03:17:25, Uri Blass wrote:
>>>>>
>>>>>>On January 12, 2001 at 23:05:23, Christophe Theron wrote:
>>>>>><snipped>
>>>>>>>However I can tell you in advance that you will (probably) discover that Chess
>>>>>>>Tiger and Gambit Tiger are extremely selective. And the next versions will be
>>>>>>>even more selective.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>    Christophe
>>>>>>
>>>>>>
>>>>>>Does it mean that it is not going to find a4 at smaller depth?
>>>>>>
>>>>>>Uri
>>>>>
>>>>>
>>>>>
>>>>>I don't care about finding a4. I don't care about solving test suites faster.
>>>>>
>>>>>I do care about playing stronger, and it's a different story.
>>>>>
>>>>>
>>>>>
>>>>>    Christophe
>>>>
>>>>Basically the stories are similiar and in most of the cases the better program
>>>>in playing games is also better in solving test suites.
>>>>
>>>>Uri
>>>
>>>
>>>I think you are right. But if my program gets better at solving test suites, it
>>>will be because I'm trying to make it stronger in real games.
>>>
>>>That's why I don't care about finding a4 in this position.
>>>
>>>
>>>
>>>    Christophe
>>
>>
>>This is a point I have made many times...  "cause" and "effect".  Is doing
>>better on test suites an effect of playing better?  (I think so).  Or is
>>playing better a result of doing better on test suites?
>>
>>There are other similar cause and effect questions about other things like
>>space, mobility, etc...
>
>
>
>In the case in question I agree with you that doing better on test suites is a
>by product of playing better overall.
>
>I have already noticed it, very clearly, with my own programs.
>
>I have never noticed that it worked in the opposite direction, and I can even
>say that I have noticed that I could easily weaken my program by trying to tune
>it to test suites.

The question is if you cannot improve your program by using the weaker engine
that you generate only in part of the cases because it is clear that the weaker
engine is sometimes better(otherwise it could not be better in test suites).

Uri



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