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Subject: Re: Question about Alpha-Beta-Improvements

Author: Rafael Andrist

Date: 03:13:31 04/24/01

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On April 23, 2001 at 15:14:00, Antonio Dieguez wrote:

>>You forget that you have a branching factor of 100 at the root is ex. 1 and one
>>of 10 in ex. 2.
>>
>>Using "my" definition, it isn't very different:
>>ex.1: 3.50
>>ex.2: 2.52
>
>ok, not MUCH different.
>
>Am sorry about being too much conclusive in my reply, but I just saw it strange.

That's normal for a chess player or for a programmer :)
It happens sometimes also to me.

>Now I could like the formula, but only at high depths.

Yes, at low depths is does not work very well.

>Anyway I think is better b=(n-(n at depth 1))^(1/d-1), what do you think?

to measure the effectiveness of a program, it may be a better a value (I need to
test it out)

(I've seen your correction)

>
>Ouch I see you really have a high branching factor. can you supply the position
>of that search?

After adding a killer heuristic, the branching factor is now about 7. The
position is after 1.e4 e6 2.f4 Be7 3.d4 d5. It occured in a game with my prog.
FEN rnbqk1nr/ppp1bppp/4p3/3p4/3PPP2/8/PPP3PP/RNBQKBNR w KQkq d6 0 4

>Antonio...
>

Rafael B. Andrist



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