Nalimov egtb probing code

Fabio Gobbato · Post by **Fabio Gobbato** » Mon May 16, 2016 8:41 pm

Where can I find the probing code for the Nalimov egtb?

Joost Buijs · Post by **Joost Buijs** » Mon May 16, 2016 8:49 pm

You can find it in the Crafty source code, you'll need permission from Eugene Nalimov and Andrew Kadatch to use it.
Nowadays most people use Syzygy, but it is nice to have distance to mate information, with SSD's getting cheaper the larger size of Nalimov egtb is not such a big problem anymore.

Vinvin · Post by **Vinvin** » Mon May 16, 2016 8:50 pm

Fabio Gobbato wrote:Where can I find the probing code for the Nalimov egtb?

Probably in Crafty. But you have to get the permission of Eugene Nalimov to release your code with it.

egtb.cpp in the source here http://www.craftychess.com/crafty-25.0.1.zip .
Found here http://www.craftychess.com/

yurikvelo · Post by **yurikvelo** » Mon May 16, 2016 8:56 pm

reference implementation by Eugene Nalimov and Robert Hyatt was realized in Crafty, with Tablebases and probing code available
https://www.cis.uab.edu/hyatt/crafty/source/

probe.c

Code: Select all

 *******************************************************************************
 *                                                                             *
 *  EGTBProbe&#40;) is the interface to the new tablebase code by Eugene Nalimov.  *
 *  This is called from Search&#40;) after a capture, when the number of pieces    *
 *  remaining on the board is less than or equal to the max number of pieces   *
 *  we have in the EGTB files that are available for use.                      *
 *                                                                             *
 *******************************************************************************

Nordlandia · Post by **Nordlandia** » Mon May 16, 2016 9:23 pm

Joost Buijs wrote:You can find it in the Crafty source code, you'll need permission from Eugene Nalimov and Andrew Kadatch to use it.
Nowadays most people use Syzygy, but it is nice to have distance to mate information, with SSD's getting cheaper the larger size of Nalimov egtb is not such a big problem anymore.

I wish there were "Stockfish Matefinder" with Nalimov support.

Yes, indeed Nalimov still has it use today. Although big and cumbersome/clumbsy.

velmarin · Post by **velmarin** » Mon May 16, 2016 9:34 pm

Arasan.
http://www.arasanchess.org/downld.shtml

hgm · Post by **hgm** » Mon May 16, 2016 9:50 pm

Nordlandia wrote:I wish there were "Stockfish Matefinder" with Nalimov support.

Yes, indeed Nalimov still has it use today. Although big and cumbersome/clumbsy.

Why not use Gaviota EGTs?

Nordlandia · Post by **Nordlandia** » Mon May 16, 2016 9:55 pm

hgm wrote:
Nordlandia wrote:I wish there were "Stockfish Matefinder" with Nalimov support.

Yes, indeed Nalimov still has it use today. Although big and cumbersome/clumbsy.
Why not use Gaviota EGTs?

Gaviota is 10% less in space.

Hardly a difference at all. Also 6-Men do not exist in that format.

You mean for Stockfish, i'm not 100% certain but Stockfish do not support Gaviota.

hgm · Post by **hgm** » Mon May 16, 2016 10:00 pm

Nalimov probing code is not compatible with the GPL, so Stockfish or Stockfish derivatives can NEVER get permission to use it. For Gaviota EGT you don't have that problem.

Nordlandia · Post by **Nordlandia** » Mon May 16, 2016 10:03 pm

Custom stockfish version with Gaviota support is handy indeed for endgame studies and such inolving mate in x numbers.

Depth To Mate over Syzygy is more appealing.

Nalimov egtb probing code

Nalimov egtb probing code

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