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Subject: Re: Null move and move ordering stats

Author: Severi Salminen

Date: 04:31:02 12/20/01

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>96-99% is incredibly high - it's hard to believe, actually.

I'd gladly post the sources, but...nope ;) I had thought that 95% is a normal
figure but it seems to be high, I'm not complaining though! I checked the code
and it seems to OK: I increase moves_searched after I have really searched a
legal move (futile and illegal moves don't count as they are not searched) and
then I increase FailHighCount and FirstMoveFail counters as necessary. And now I
removed the code from qsearch, which might have biased the figures (well, it
didn't). I'm using PVS and SEE (the latter of course has a great impact on move
ordering).

>Could you post the test position you're using?

It's the position after 1.e4 e5 2.d4 d5:

[D] rnbqkbnr/ppp2ppp/8/3pp3/3PP3/8/PPP2PPP/RNBQKBNR w KQkq - 0 1

>It would also be nice to know if
>these numbers are repeatable over a large set of positions.

I have not yet implemented test suite processing, but I can test individual
positions of course. From initial position, the percentage was 94%.

Severi



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