Author: Robert Hyatt
Date: 06:12:04 03/30/01
Go up one level in this thread
On March 29, 2001 at 22:23:44, Christophe Theron wrote: >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 That is correct...
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