Author: Uri Blass
Date: 01:52:21 11/21/02
Go up one level in this thread
On November 21, 2002 at 04:48:15, Uri Blass wrote:
>On November 20, 2002 at 19:02:49, Gian-Carlo Pascutto wrote:
>
>>On November 20, 2002 at 18:54:30, Omid David Tabibi wrote:
>>
>>>>Could you please compare (Adptv + small quiesc) vs (Vrfd +small quiesc) ?
>>
>>When I have more time.
>>
>>If you want more data, I expect others will post results
>>from their programs as well. Maybe those are more encouraging...
>
>I will post after I implement the code.
>I have a problem because I am not sure how to implement the code in movei:
>
>
>
>Movei does not use null move pruning when the remaining depth is 1.
>I have special pruning rules for that case
>The pseudo code of movei is:
>
>
>int alphabeta(int depth, int alpha, int beta)
>{
>1.depth=depth+extensions
>2.if (depth<=0) return quiescence()
>3.if pruning rules happen return beta(pruning rules happen mainly when depth=1)
>4.if repetition return 0
>5.if null move conditions(null move conditions include depth>=2)
>{
>donull move;
>val=-alphabeta(depth-4,-beta,-beta+1);
>if (val>=beta)
>return val;
>}
>...standard alphabeta
>}
>
>
>When I try depth>=1 instead of depth>=2 I find that it probably does not help
>me(maybe because of my pruning that happen often when depth=1).
>
>Uri
I did not do a full test suite but I found in few test positions that sometimes
I even get a bigger tree with depth>=1 and not with depth>=2 and that I also get
less nodes per second with depth>=1 so I decided not
to use it because taking more risks does not seem to be a good idea if I often
get a bigger tree and search slightly slower.
Uri
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