Author: Robert Hyatt
Date: 11:07:57 11/09/01
Go up one level in this thread
On November 09, 2001 at 09:44:14, Tony Werten wrote: >On November 09, 2001 at 09:40:29, Robert Hyatt wrote: > >>On November 09, 2001 at 02:16:49, Tony Werten wrote: >> >>>On November 08, 2001 at 18:04:43, Robert Hyatt wrote: >>> >>>>On November 08, 2001 at 14:46:15, Tony Werten wrote: >>>> >>>>>On November 08, 2001 at 12:01:16, Robert Hyatt wrote: >>>>> >>>>>>On November 08, 2001 at 07:45:59, Vincent Diepeveen wrote: >>>>>> >>>>>>>On November 07, 2001 at 15:51:59, Robert Hyatt wrote: >>>>>>> >>>>>>>>On November 07, 2001 at 12:22:05, William Dozier wrote: >>>>>>>> >>>>>>>>>Good day to all of you, Question: Is there a killer book for black? Is there a >>>>>>>>>book for black, so it can counter all the white moves. When does the table base >>>>>>>>>start kicking in; in crafty? >>>>>>>> >>>>>>>>I doubt that there is any "killer book" for black or white, assuming your >>>>>>>>opponent does his homework. >>>>>>>> >>>>>>>>tablebases start getting hit when there are around 16 pieces left on the board, >>>>>>>>most of the time. Others might get different results of course. I have seen >>>>>>>>hits with 20 pieces left... but not very often. >>>>>>> >>>>>>>With all extensions turned on i get hits from openings position >>>>>>>already after a night of search with big hashtable. >>>>>> >>>>>>Overnight that is possible. I interpreted it as "during a real game". :) >>>>> >>>>>Depends on where you probe. I probe everywhere and have seen tablebasehits with >>>>>30 pieces on the board in 3 minute searches. Useless but funny. >>>>> >>>>>Tony >>>> >>>> >>>>What happens when you get into 8-10 piece endings? Does your speed die? I >>>>did that early on and actually lost winnable games, because I slowed down so >>>>bad the search depth was not enough to reach won positions. IE from 100K it >>>>would drop to 1-5K... >>> >>>If I have a 10 ply search I will probe the first 10 ply on harddisk, for the >>>rest I use my own tablebaseformat wich stores the 4 and 3 pieces in memory, >>>making probing not more expensive than an evaluation. >>> >>>At the dutch open I set up a testposition with 6 pieces and still got 1Mn/s on a >>>AMD 1700+ >>> >>> >>>Tony >>\ >>That isn't "probing everywhere". IE with a 10 ply search, you can extend to >>way beyond 20 plies. Probing out there will hurt. And if you probe in the >>q-search it will hurt even more. >> >>Your limit is the same as I have been using for years... > >Sorry, probing the 5 pieces the first 10 ply and probing 4 pieces in the rest of >the tree is not probing everywhere ? No. I interpret the question as "probing endgame tables on disk". The 3-4 piece files don't hurt a thing. But probe the 5-6 piece files in the q-search and things are different. > >Don't get it. >I don't probe 6 pieces, does that mean I probe nowhere ? > >Tony "probe" in this context was refering to disk I/O. That is what kills performance, not poking around in memory.
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