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Subject: Re: Crafty Book Implementation

Author: Robert Hyatt

Date: 13:12:07 06/12/01

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On June 12, 2001 at 12:00:41, Daniel Clausen wrote:

>Hi
>
>On June 12, 2001 at 09:16:58, José Carlos wrote:
>[snip]
>>If you allow transpostion from non-book positions, you can get the behavour
>>you discribed. But if you don't, you have to face the possibility of a human
>>player transposing to drive you into a trick.
>>I'm at work, so I can't figure a real example, but imagine that, in the
>>example you gave, axb5 was wrong due to a deep trick. A smart GM could drive
>>you into that position, and the Crafty would (possibly) take the bishop
>>happily.
>>So, the way you do things, you'll take the piece and win easily most of the
>>times, but can fall into a trick, and lose badly in an important game.
>>Allowing trasposing always, you'll miss those easy wins (but you'll probably
>>win anyway, since a player that gives a bishop for free will always lose
>>against Crafty) but avoid the GM trick.
>
>I would consider this "optimizing at the wrong places". While I can imagine that
>such an example exists, I don't think it's worth the time. :)

It actually turns out to be important (for me) to do this.  Otherwise it is
possible for a GM to "offer" Crafty the chance to remain in book by playing
a move out of sequence, and dropping it into an opening it has tried to avoid
(such as the Stonewall).  If it is out of book, it will _not_ fall into a
stonewall attack.  But while in book, anything can happen.  I have some opening
lines that avoid most stonewall attempts very quickly, but a good GM or IM
used to find ways around this.

It is much harder to do now...



>
>I've always imagined that, should I ever play against Kasparov and see an
>unprotected queen from him for no (for me) obvious reason, I still wouldn't take
>it, because I'm sure there _will_ happen something bad if I capture it. Of
>course something bad will also happen if I choose another move, so it doesn't
>really matter. :)


I trust the search to find this kind of stuff. :)



>
>Btw: Wasn't it GM Larsen who once played against Deepthought, captured an
>unprotected knight and then DT announced a mate in 18?

possibly...


>
>Sorry I got carried away a lil here. I realize that all these cases are not the
>same, but still they're related a bit.
>
>Regards,
>
>Sargon
>
>--
>One day Alice came to a fork in the road and saw a Cheshire cat in a tree.
>"Which road do I take?" She asked.
>His response was a question: "Where do you want to go?"
>"I don't know," Alice answered.
>"Then," said the cat, "it doesn't matter."
>
>   Lewis Carroll
>   Alice In Wonderland



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