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Subject: Re: Selectivity

Author: Bas Hamstra

Date: 05:46:51 01/15/01

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On January 13, 2001 at 13:37:12, Christophe Theron wrote:

>On January 13, 2001 at 01:10:26, Bas Hamstra wrote:
>
>>On January 12, 2001 at 23:05:23, Christophe Theron wrote:
>>
>>>On January 12, 2001 at 22:08:50, Bas Hamstra wrote:
>>>
>>>>I don't know if it useful to compare nodes this way. My first PV at depth=10
>>>>comes in the order of nodes of GT, but then it switches 4 times, to end at a4 at
>>>>22M nodes. I might be that GT was lucky to not have those expensive PV switches.
>>>>
>>>>Bas.
>>>
>>>
>>>
>>>It is true that you need to measure the number of nodes to reach a given ply
>>>depth on a number of typical positions before you can say which program is the
>>>most selective.
>>>
>>>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
>>
>>No, no, don't do that! That's the way to promoting a pawn at move 216. Watching
>>grass grow is far more interesting. Do you really want to score 55.1% at SSDF in
>>stead on 54.93%? In stead of fireworks?
>>
>>Slightly worried,
>>Bas.
>
>The tree analyzed by Chess Tiger or Gambit Tiger in a typical middlegame
>position is probably 10.000 to 100.000 times bigger than the one a GM would
>analyze in the same position.
>
>Do you find this satisfying? I don't.

I don't know. But what I do know is that I like Comet, Diep and TheKing,
programs that play nice and pure attacking chess and I really hate more or less
the rest of the programs, that try to get in the endgame as fast as possible to
promote a pawn. I hate them totally utterly double when they win a high
percentage of games with such anti chess. GT is not like that of course, but
it's no attack artist either. If you could choose between a more pure and
attractive playing style or win more games with an ugly style, what would you
choose?


Bas.




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