Author: Shep
Date: 00:03:17 08/11/99
Go up one level in this thread
On August 10, 1999 at 22:12:50, Tina Long wrote:
>Hi guys,
>I set up a position, I ask different programs to anayse it, after 15minutes I
>get the following depth of search results (all are approximate)
>
>Fritz 5.32 13/28
>Hiarcs 7.32 9/31
>Nimzo 11/26
>
>These are saying Brute force search/length of longest extension. Correct?
Not exactly. Null move and other tricky things are being used, so there is even
some kind of selectivity involved in the first numbers.
No computer apart from maybe Deep Blue can possibly search 13 ply brute force.
>Rebel 12
>
>Brute force depth. The warroom says 15/13/37, current move being analysed 13,
>average depth was 13, furthest extension 37. Correct?
Yes, but I think the same applies as I said above, no "true" brute force.
(Ed???)
I believe someone once mentioned that Genius is the only program where x/y
really means "x ply brute force". And Genius' "x" hardly ever goes beyond 7 even
on my PIII-550 machines.
>CM6000 3/13 (ss is set at 10)
>
>Here's my real query:
>Surely this can't be brute force 3, furthest extension 13 (that would take Fritz
>or even Hiarcs .5 second).
>
>The CM6000 manual says it is Selective search for three plys & brute force for
>plys 4 through 13.
>Surely that can't be right, a selective search for the first three plies must
>miss opportunities.
Of course this is nonsense. I don't even remember what the manual says, but here
someone obviously grossly misunderstood what Johan told him. :)
>I have wondered about this since CM4000.
When CM shows "3/13", it means
- 3 ply searched brute force ("true" brute force)
- 13 ply searched using extensions such as null move (?) and others
(so this is what Fritz would display as "13/y")
CM does not show the maximum selective depth as most other programs do.
I suppose this is equal to "displayed selective depth + Max Depth defined in the
personality setup", but I'm not 100% sure.
---
Shep
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