Computer Chess Club Archives




Subject: Re: PB-ON vs PB-OFF (final results)

Author: Inmann Werner

Date: 03:32:41 10/15/99

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On October 15, 1999 at 04:42:00, Ed Schröder wrote:

>To enrich the discussion about the value of the "Permanent Brain" (PB) I
>have started 2 experiments with Rebel Century (RC) which will give some
>data for a better judgement of the value (in elo) of the permanent brain.
>Thinking it all over I still believe that the best way to provide data is
>to test the SAME program (PB_ON) versus (PB_OFF).
>#1. Both programs are equal in strength.
>#2. There is no single evidence (yet) that the % of predicted moves is
>higher playing the same program. Rebel (or any other program) percentage
>against Program_X might be 25% and against Program_Y 75% and against
>itself maybe 50%, nobody knows.
>The final result:
>RC (PB=ON) vs RC (PB=OFF)
>100 auto232 games
>Time control: 60 secs average.
>Hardware: 4xPII-266 + 2xPII-450
>Result: 61-39
>RC (PB=ON) vs RC (PB=OFF)
>100 auto232 games
>Time control: RC (PB=ON) 30 sec average
>Time control: RC (PB=OFF) 60 sec average
>Hardware: 4xPII-266 + 2xPII-450
>Status: 57-43
>I find the 57-43 result quite shocking. I expected (and hoped for) a close win
>for the PB_ON version but not a clear victory.
>I think it would be a wise thing if others are willing to do the same
>experiment with other programs. Somehow I have the feeling you will
>totally different results doing so.
>Ed Schroder

Experiment 2 is really interesting!

PB=ON Engine has 30 secs + 60 secs ponder Time
PB=OFF Engine hash 60 sec only.
Have you any chance to get the percent of PB hits?

how fast (NPS) are the two machines compared?

Do you think, that also if PB searches the wrong move, the filling of the
hashtables is such extremly useful?

How about the time management. Do both engines really use their time, they have,
nearly equal?

Much questions arise...., or is it only statistic, "bad luck" for the PB=OFF


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