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Subject: Re: Why is Rebel 8 engine within Rebel 9 15 % slower than original Rebel 8 ?

Author: Ulrich Tuerke

Date: 09:58:58 11/18/97

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On November 18, 1997 at 01:30:11, Jouni Uski wrote:

>In my 486/150 Mhz original Rebel runs with 25000 nodes/s, but Rebel 8
>engine with "only" 21000 nodes/s. I tested with 4 first LCT II positions
>and counted average value.
>
>Jouni
>
>BTW, it's impressive to see Rebel's max depth going to 60 ply in middle
>game!!

I really doubt, that extending the arrays of the search engine to a
maximum depth of 60 or more plys is a very reasonable thing to do. May
be it's impressive to watch the max on the display, but IMO it's very
unlikely that these distant nodes have some influence on the search
(except for slowing it down on some architectures).
A virtual advantage is that the author can claim "program can in
principle solve a mate in 29", what looks quite impressive. Other
programs (e.g. Genius) seem to go the opposite way, cutting the maximum
depth below the physical max in order to save the generation of some
nodes.
Any comments, Ed ?
Regards, Uli



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