Author: Robert Hyatt
Date: 07:17:40 11/10/01
Go up one level in this thread
On November 10, 2001 at 06:27:01, Frank Phillips wrote: >On November 09, 2001 at 18:27:05, Tony Werten wrote: > >>On November 09, 2001 at 14:07:57, Robert Hyatt wrote: >> >>>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 > >Is there any way to do this with Nalimov ETGBs under Linux? My search often >dies with table access - 21knps from several hundred thousand. I try to >convince myself that the perfect information is worth the penalty on average. > >Frank You can do like the Nimzo guys did. Just set up 4 loops (for 4 piece endings) and use each subscript to stick a piece on that square. Probe the EGTB and if you get a score >0 store "mate", =0, store "draw" and <0 store "mated". Only probe these beyond the first N plies of the search so that you get real mate scores early, just win/lose/draw deep in the search. If you do this for _all_ 4 piece files, you are going to end up with 40-50 megs of stuff. To shrink this they didn't do all tables...
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