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Subject: Re: Null Move R Value: what do you use?

Author: Will Singleton

Date: 08:05:50 09/22/05

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On September 22, 2005 at 09:25:09, James Swafford wrote:

>
>I recently switched from R=2 to R=3 in Prophet.  It looked
>very promising at first... I got my first two wins against
>Arasan on ICC.  However, after watching more games, it seems
>a bit too aggressive.  Prophet completely self destructed
>against Tinker almost right out of the opening.
>
>I'll have to experiment a bit, but I'll probably settle on
>some R=2/3 compromise.
>
>How many of you use R=2?  R=3?  If you do R=2/3, what kind
>of algorithm do you use to decide?  I used one proposed by
>(I think) Vincent in Tristram: don't allow R=3 twice in a
>row (or three times in a row?), and it seemed to work pretty
>good.
>
>--
>James

Sounds like significant progress.  fwiw, here's what I do:

if (!last_was_null && allow_null && !escape && real_draft >= 1 && !in_pv) {

   if (real_draft>4) current_reduction = 3;
   else current_reduction = 2;

}

Allow_null is set by game stage and whether the king is being closely attacked
without check.

Will




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