Author: Mike S.
Date: 16:33:03 10/22/03
Go up one level in this thread
On October 22, 2003 at 09:52:29, Uri Blass wrote:
>(...)
>If aristarch has better branching factor than Fritz5.32 then it proves nothing
>because Fritz5.32 is an outdated engine.
Coincidentially, I've included both engines in a test for the branching factor,
IOW factor = total time after ply x / total time after ply x-1. (Im not sure if
we have the same definition.)
ply depth: 10 11 12 13 14 15 16 Ø
--------------------------------------------------------------------------------
Fritz 7 2,9 2,1 2,4 3,7 2,8
Fritz 5.32 3,0 4,9 2,7 >> 3,5
Chess Tiger 14.0 3,1 3,0 2,2 2,3 2,7
Hiarcs 7.32 3,9 5,4 2,4 3,9
Comet B48 3,4 1,8 2,6 2,6
Shredder 5 4,8 2,9 2,1 2,5 3,1
Yace 0.99.56 1,9 3,7 2,7 2,8
Aristarch 4.4 2,3 4,4 >> 3,4
Crafty 18.15 2,7 2,9 2,0 2,5!
--------------------------------------------------------------------------------
average 3,0
(tested on Athlon@1,2 GHz, 256 MB Hash, from the starting position*)
*) later I realised: To use the starting position wasn't the best choice, as the
number of possible moves in the first plies is not typical...
But the factor was very similar for Fritz 5.32 and Aristarch 4.4 (which isn't
the latest version though)... Unfortunately, there are not enough values for a
reliable result. It was only a quick analysis done in short time.
I have no opinion or results, how this factor is related to the strenght in
blitz vs. long time controls... for example, I'm not aware that Hiarcs 7.32
(3,9) was particularly worse in long time controls compared to blitz, nor that
it was vice versa with Crafty 18.15 (2,5!). Although it would seem logic that an
engine with a smaller branching factor can gain more depth from additional time.
But this is only the base depth (or what it's called); I guess more clever
selectivity and deeper extensions can make up for a slightly bigger branching
factor, than the opponent has.
It was also interesting to see in the overview, how different the additional
time consumption is sometimes, *from ply to ply*. Obviously, it doesn't matter
at all if it's from an even to an uneven ply or vice versa. The newer strong
engines seem to be more constant.
Regards,
Mike Scheidl
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