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Subject: Re: alpha-beta is silly?

Author: blass uri

Date: 15:39:43 06/02/98

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On June 02, 1998 at 16:48:17, Komputer Korner wrote:

>On June 02, 1998 at 11:22:58, blass uri wrote:

>>good players do also other things
>>
>>1)they know they should analyze a move
>>that they think it leads to an unclear position
>>(for example if they think to sacrifice material for initiative)
>>
>>2) if they do not see a forced line
>>(they have no time to check all the possibilities)
>>they can use a statistics to decide
>>if they see in a position  that every line they analyze
>>leads to their win when they play against themselves
>>they decide to go to the position.
>>
>>3)good players see there are moves that should not be analyzed
>>when in the alpha-beta we analyze every legal move to prove it is not
>>the
>>best.
>>Uri

I admit I should not write 3
because you can use the alpha-beta
for a tree of logical moves instead of a tree of legal moves.
>
>
>It is not a requirement of alpha beta that every move be analyzed. Alpha
>beta is actually a rigorous mathematically sound rule that certain moves
>do not have to be analyzed because mathematically they have been shown
>to be inferior without having to search their move trees.  You are
>confusing alpha beta and intuition. They ARE NOT exact opposites of each
>other despite what you think.
>Chess players are intuitive even Kasparov. This is necessary because of
>poor human calculation speed. Chess computer programs can be either
>selective search or full width. Either way they all use alpha beta which
>is really only a mathematically pruned minimax. Even humans use alpha
>beta. Your argument is with intuition, knowledge and full width
>searching. What you call knowledge is stuff that hasn't been programmed
>into chess computers yet. It is very difficult to teach a robot to pick
>up a glass off of a table. You accomplish that task very easily. The
>same thing goes for teaching chess knowledge to a program. Don't confuse
>a mathematical principle like Alpha beta with chess knowledge.

You are right I confused the alpha beta with chess knowledge
what not to search.

> I think
>it is time for Bob Hyatt's yearly alpha beta lesson because it is clear
>you do not understand what alpha beta is.







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