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Subject: Re: about using killers in Rebel and about programming

Author: Antonio Dieguez

Date: 16:35:40 12/31/02

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On December 31, 2002 at 19:30:52, Antonio Dieguez wrote:

>On December 31, 2002 at 19:22:26, Uri Blass wrote:
>
>>On December 31, 2002 at 18:59:07, Antonio Dieguez wrote:
>>
>>>On December 31, 2002 at 17:49:52, Uri Blass wrote:
>>>
>>>>From Ed programmer stuff
>>>>
>>>>Killer-One [current ply]      110
>>>>Killer-One [current ply-2]    108
>>>>Killer-Two [current ply]      106
>>>>Killer-Two [current ply-2]    104
>>>>
>>>>I until today used only
>>>>
>>>>Killer-One [current ply]
>>>>Killer-Two [current ply]
>>>>
>>>>I am interested to know if using 4 killers is a new idea or maybe this idea is
>>>>known to be used by other programs.
>>>
>>>It is obviusly not a new idea, but a candidate to new idea is using exactly
>>>those 4 killers, and the exact details of the rest of Rebel ordering.
>>>
>>>I use
>>>
>>>Killer-One   [current ply]
>>>Killer-Two   [current ply]
>>>Killer-Three [current ply]
>>>Killer-Four  [current ply]
>>>Killer-One   [current ply+2]
>>
>>You say that you use ply+2 and not ply-2
>
>yes.
>
>> or maybe you say that you the first 4
>>are like Ed as "exactly those 4 killers suggest.
>
>I don't understand this but surely not.
>
>>>When a killer causes a cut-off it win two places.
>>>When a killer is the best move (with exact score) it win 3 places.
>>
>>Do you say that a killer that give something above alpha but not above beta
>>win 3 places in case that you find nothing better than it?
>
>yes.
>
>>>Also when the recommended move of the hashtable causes inmediate cutoff it win 3
>>>places.
>>
>>I thought that every time a move cause cutoff it is considered as the first
>>killer move for that ply and the question if it is because of hash or because of
>>other reasons is not relevant.
>
>I though the hash was something apart.
>And as I see in Ed's page, he has it apart too, with 127 points.

oops I didn't answer well.
Forget those two sentences.

my answer is that at least for me it is relevant.

And when a cutoff ocurres it is not so obvius that promote to the first place or
even second is the best.



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