Author: Christophe Theron
Date: 12:12:21 03/29/01
Go up one level in this thread
On March 29, 2001 at 14:39:34, Tony Werten wrote:
>On March 29, 2001 at 14:21:16, Christophe Theron wrote:
>
>>On March 29, 2001 at 13:49:06, Tony Werten wrote:
>>
>>>On March 29, 2001 at 13:31:59, Christophe Theron wrote:
>>>
>>>>On March 29, 2001 at 09:14:57, Robert Hyatt wrote:
>>>>
>>>>>On March 29, 2001 at 06:22:13, Jouni Uski wrote:
>>>>>
>>>>>>On March 29, 2001 at 06:17:50, Alexander Kure wrote:
>>>>>>
>>>>>>>On March 29, 2001 at 04:37:19, Tony Werten wrote:
>>>>>>>
>>>>>>>>Hi all,
>>>>>>>>
>>>>>>>>until what depth do various programs probe the tablebases ?
>>>>>>>>
>>>>>>>>cheers,
>>>>>>>>
>>>>>>>>Tony
>>>>>>>
>>>>>>>
>>>>>>>Hi Tony,
>>>>>>>
>>>>>>>In London 2000, I let Nimzo 8 play with a depth of 6 plies, but later I came to
>>>>>>>the conclusion that 8 plies might be better overall. This is indeed the default
>>>>>>>setting of NimzoX and Varguz playing on ICC.
>>>>>>>
>>>>>>>Greetings
>>>>>>>Alex
>>>>>>
>>>>>>Sorry one stupid question: is this the first or last 6/8 plys?
>>>>>>
>>>>>>Jouni
>>>>>
>>>>>
>>>>>His statement would make no sense if it were the _last_ 6-8 plies. Those
>>>>>are the ones that kill performance if you aren't careful. The first 6-8 plies
>>>>>don't cost a thing.
>>>>
>>>>
>>>>
>>>>But it could also mean it probes TBs in all the plies except the last 6/8.
>>>>
>>>>Meaning that if Nimzo is doing a X plies search, then the program probes the TBs
>>>>in the tree for all nodes that have a distance from the root below or equal to
>>>>X-6 (or X-8).
>>>
>>>Could be but that would mean, with an average depth of 10 to 12, you'd be
>>>probing the first 4 to 6 ply. I mean, it helps but it could help more.
>>>
>>>That is, not counting extensions, but you if you search 10 ply, you don't know (
>>>at ply 8 ) how many plies are still coming.
>>>
>>>cheers,
>>>
>>>Tony
>>
>>
>>But you know how many plies you have done since the root position...
>
>2 possibilities:
>- We are talking about different things
>- I don't get it
>
>Might be both.
>
>Tony
You don't know how many extensions you are going to do, so you just ignore
extensions and assume you are going to search full width the same number of
plies as your iteration number.
So at iteration 10, stop probing TBs after two moves from the root (assuming
like Nimzo that you don't probe in the last 8 plies of search).
That is why I say "you know how many plies you have done since the root
position...".
Christophe
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