Author: Christophe Theron
Date: 19:23:44 03/29/01
Go up one level in this thread
On March 29, 2001 at 15:34:45, Alexander Kure 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).
>>
>>I don't think that probing the TBs in the first 6/8 plies of the search makes
>>any sense.
>>
>>
>> Christophe
>
>
>Hi Christophe,
>
>Actually, Nimzo is probing his EGTB (kind of compressed Nalimov EGTB, where only
>2 bits are stored for the information: win, draw or lost) in the q-search, to
>look up if the current position is won, lost or a draw.
>What i meant in my answer to Tony is that Nimzo probes the first 8 plies of the
>*Nalimov* EGTBs in order to get the right move.
>
>Greetings
>Alex
I'm sorry Alex, but I do not understand what you mean.
Do you mean that you probe the Nalimov TBs only in the first 8 plies of the
search, which gives you a MOVE and a distance to mate if there is a TB hit only
for the first 8 plies, and when you reach deeper ply depths you only get a
partial information (win/draw/loss), but the partial info takes less time to
find because it is more compressed (can be fully loaded in memory)?
As you know I'm a little bit new to the EGTB world, so I'm certainly still
missing some subtle tricks...
Christophe
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