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

Author: Antonio Dieguez

Date: 15:59:07 12/31/02

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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]

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.

Also when the recommended move of the hashtable causes inmediate cutoff it win 3
places.

At least for me it works much better than using only 2 or 3 killers in terms of
time to reach depth. I don't use much other ordering though, as I get much
counterintuitive things.

BTW Very cool page the one of Ed. Very enjoyable. Keep going Ed! :)



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