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Subject: Re: Forward Pruning...

Author: Joshua Haglund

Date: 13:29:15 02/29/04

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On February 29, 2004 at 12:48:06, Uri Blass wrote:

>On February 29, 2004 at 12:20:03, Joshua Haglund wrote:
>
>>On February 29, 2004 at 03:20:30, Matthias Gemuh wrote:
>>
>>>
>>>
>>>
>>>My engine has a very unstable and unreliable search.
>>>Sometimes I think I implemented what you are proposing.
>>>My opinion is that the blindness introduced by such tricks would really hurt.
>>>
>>>/Matthias.
>>
>>yes! it wouldn't do the best search if it didn't reach great depth where f = 3;
>>If your engine searches deep try ply > 12. If it doesn't try ply 8, etc... :)
>>
>>
>>I have reason to believe a person will gain atleast 1 ply in the same amount of
>>searched time.
>>
>>example
>>time = 30;
>>ply 7 = 4 seconds.
>>ply 8 = 13
>>no more plies reached.
>>
>>// with idea.
>>time = 30;
>>ply 7 = 1 second
>>ply 8 = 5
>>ply 9 = 20 seconds
>>
>>Maybe this would be good for long time controls? Skip shallow and go to deeper
>>lines.
>>
>>Thanks for your reply,
>>
>>Joshua Haglund
>
>I can only say that I do not understand your idea.
>
>If you suggest to do selective search in the first plies then it seems to me a
>bad idea because you may miss important moves.
>
>It is more logical to be selective in the last plies and programs do it for
>example by qsearch but even then I do not see why do you use fixed number of
>moves and the number of moves that you search should be dependent on the
>position.
>
>prunning illogical moves is something important to do and programmers know it
>so it is not new information.
>
>Uri

I thought about doing a selective search also... pretty much the same thing.

If you skip time wasted looking at first several plies, it'll get to a greater
depth in less time to look for good moves.

Thanks for your reply,

Joshua Haglund



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