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Subject: Re: Frustrated beyond words

Author: Vasik Rajlich

Date: 06:58:30 02/15/06

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On February 15, 2006 at 07:45:37, David B Weller wrote:

>I am a broken man ...
>
>I have been searching in vain for the reason(s) that my engine searches so
>slowly compared to others...
>
>1/5 the NPS
>5 ply less
>
>NPS and depth is still < Gerbil even when using a rediculously simple SE of
>material ONLY
>
>using:
>
>AlphaBeta fail soft with Aspiration=30 and PVS
>Null Move R=2 (no verification)
>Futility Pruning at Frontier
>Delta Pruning in Quies
>Low History Reduction [late in move list]
>*not using IID. It does not help
>
>Extensions:
>Check
>One Reply
>Mate threat
>Pawn to 7th
>
>extension are UNLIMITED
>[tried several extension limiting schemes with little difference]
>
>Move order:
>ETC [used only when in check]
>HASH
>PV
>MATE KILLER
>MVV/LVA
>KILLERS (2)
>HISTORY
>
>Static eval is about half way between Gerbil and Crafty [in complexity]
>
>I have profiled the code, and there is nothing abnormal. Spends most time in
>eval. [IIRC 30+ %]
>
>Estimated average branching factor is 2.4 [tested on positional suite]
>*maybe higher in games
>
>please help. About to go 'stark raving mad'

Another wild guess: are you compiling properly?

BTW - ETC only after checks is an interesting idea. Where did you get it?

Vas



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