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Subject: Re: Tony's Newsletter #22

Author: Peter Berger

Date: 03:34:33 10/29/04

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On October 28, 2004 at 10:28:55, Tony Hedlund wrote:

>On October 28, 2004 at 08:37:20, Uri Blass wrote:
>
>>On October 27, 2004 at 20:37:35, José Carlos wrote:
>>
>>>On October 27, 2004 at 09:57:20, Uri Blass wrote:
>>>
>>>>On October 26, 2004 at 20:53:36, Mike Byrne wrote:
>>>>
>>>>>Especially for those who want know what is Crafty 19.17 SE PB?
>>>>>
>>>>>http://home.interact.se/~w100107/issue22.htm
>>>>>
>>>>>There is also "how to" link.
>>>>>
>>>>>best,
>>>>>
>>>>>Michael
>>>>>
>>>>>;>)
>>>>
>>>>Interesting that Tony reports:
>>>>
>>>>"Crafty 19.17 come out good from book, often gets a slight advantage in the
>>>>middlegame, but somehow usually loose the endgame.
>>>>I've noticed that Crafty is especially poor in the pawn handling."
>>>>
>>>>Looking at the comments to the source code I see the following information:
>>>>
>>>>19.16:adjustments to pawn evaluation terms to improve the scoring balance.
>>>>19.17:changes to pawn evaluation to limit positional scores that could
>>>>           get a bit out of sane boundaries in some positions.
>>>>
>>>>Uri
>>>
>>>  My personal feeling while watching Crafty playing (no proofs nor scientific
>>>testing, just feeling) is that Crafty is very good at endgames, particularly in
>>>pawn endings. Comparatively, it's weaker in sharp positions with simultaneous
>>>attacks and defending crazy king attacks.
>>>
>>>  José C.
>>
>>Is this feeling based on watching Crafty19.17 and not older versions?
>>
>>I have no time to watch Crafty playing but it seems based on the notes that
>>there is an endgame problem with Crafty19.17
>>
>>Uri
>
>I've played thru 131 Crafty 19.17 games and I think Crafty is very weak in
>endgames with pawns.
>
>Tony

The results posted here by several users suggest that there is a problem that
has been introduced after 19.15 (in either 19.16 or 19.17), but Bob hasn't been
able to find it and thinks there isn't any.

I haven't downloaded 19.17 yet, but would agree to José's assessment of Crafty's
play when it is about earlier versions.

It's a pity you didn't test 19.15 IMHO, but that's just life :)

Peter



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