Author: Uri Blass
Date: 15:36:56 04/02/04
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On April 02, 2004 at 18:17:23, Uri Blass wrote: >On April 02, 2004 at 17:56:58, Robert Hyatt wrote: > >>On April 02, 2004 at 16:22:19, Jonas Bylund wrote: >> >>>Thank you very much for your detailed answers! >>> >>>When you say Diep already runs in windows mode, does that mean that it runs DOS >>>or "real" windows mode? (sorry about not being clear on that in my original >>>post) >>> >>>10GB for all the 3+4+5+6 tb's would be a HUGE success as would 20GB of course! >> >>It is also "vaporware". 3-4-5-6 tables will _not_ fit into 10 gigabytes. > >Yes but it is possible that tables that are enough to play 3-4-5-6 perfectly may >fit 10 gigabytes. > >Suppose that you have tables that have only 1/32 of the information in the >original 6-piece tables(it has information about exact distance to mate only if >the index of the position is divisible by 32). > >You can still use them in 1/32 of the positions in case that the index of the >position is in the table. > >In case that the index of the position is not divisible by 32 you can search >forward and in order to check if the index of the position is divisble by 32 you >do not need to look at the table. > >Now the question is if programs who use the smaller tables can practically play >6-piece positions perfectly or cannot do it. > >Uri Note also that nalimov admitted that he had no time to work on more efficient table for 6 pieces and the question is also how much can you compress the tables thanks to symmetry. In any case win/draw information can also be productive and in second thought I think that programs may fail in playing perfectly with only 1/32 of the information. I thought that only 1/2 of the information may be enough becase it is enough to know positions when it is white to move so by the same logic only 1/32 may be enough if you search deeper but in another thought I think that it is not so simple because the position when white to move may get index divisible by 2 but when I go only to divisble by 4 I cannot take care that the position of mate in x when x is even will get index that is divisible by 4. Uri Uri
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