Author: Vincent Diepeveen
Date: 10:46:48 08/29/05
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On August 29, 2005 at 13:13:33, Marc Bourzutschky wrote: >On August 29, 2005 at 10:27:17, Vincent Diepeveen wrote: > >>On August 29, 2005 at 03:15:54, Marc Bourzutschky wrote: >> >>Hi Marc, >> >>I just don't understand how you manage to generate a mate in 250 with >>just 500GB i/o size for krbn krb. >> >>I need like 2 TB raid5 array or something for my generator for 7 men >>I'm using bitmaps which are similar to mate in n, though not entirely, >>as i just care for WDL. >> >>that means you basically need from -mate256 to +mate255 = 9 bits per >>entry. >> >>Diep's entry size is probably bigger with 358G entries than what is possible >>if you use nalimov's scheme, i'm using my own one which simply avoids more than >>1 piece at the same square, no illegal reductions are getting done. >> >>Anyway. 2 files of 358G * 9 bits per entry is more like 800GB than it is >>close to 500GB. >> >>How do you fit this EGTB onto just 500GB disk? >> > >As described in the post, we split krbnkrb into two components, depending on the >relative color of the bishops. This reduces the problem to two independent >generations with each half the size. In addition, we use on-the-fly >compression. We used less than 250 GB during generation. Hello Marc, Thanks for your answer! So you didn't split the bishops in 4 components: white bishop for KRBN side and white bishop for KRB white bishop for KRBN side and black bishop for KRB black bishop for KRBN side and white bishop for KRB black bishop for KRBN side and black bishop for KRB of course assuming you rotate 8 fold over the king positions and not the bishop (as there is less bishops in that case). how many entries does your indexing scheme use for one of those files KRBNKRB? how many bytes (or bits) per entry did you use at generation time? Best regards, Vincent >>Are you using the one sided Thompson idea in this context? > >Yes, since we can always get the wins for RB over RBN by generating krbkrbn. I >may do this at some point for completeness' sake. I generated those "flipped" >tablebases for all the other endgames created so far, which is how I identified >the full point mutual zugzwangs in knnnnkq and kbnnnkq. DTL could of course >also be constructed from these. > >-Marc
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