When will 8 piece tablebase be ready?

[the_real_greco]

http://arves.org/arves/index.php/en/lat ... plorations

[Nordlandia]

http://arves.org/arves/index.php/en/lat ... plorations

Much appreciated. Was not aware of this

[duncan]

http://arves.org/arves/index.php/en/lat ... plorations

Great stuff.


Anyone know how long to complete ?

[DrCliche]

If a ratio of 0.05 bytes/NULP is assumed, then the whole set of 8-man EGTB would be circa 1.7 PiB in size, way below 10 to 20 PiB mentioned above if my fast math is not wrong.

You need more storage to make the tablebases than you do to store the finished product.

[Ajedrecista]

Hello Nickolas:

You need more storage to make the tablebases than you do to store the finished product.

Sure, I was only thinking on the final release. Good point. I do not know how much storage will be needed for the intermediate results in comparison with the final results, by the way. However, I think you do not need to save all the intermediate results, do you? If you start with 7v1 as a test, once you finish them you can (safely?) delete all but the final results because 7v1 will not be useful for 6v2, 5v3 and 4v4 generations. Then you go with 6v2 for example and once you are done, then delete the intermediate results of 6v2 and so on.

I returned to NULP site and extracted some data on 7v1, 6v2, 5v3 and 4v4:

Code: Select all

Type     Number of endgames              NULP
------------------------------------------------------
7v1              210             1,292,210,487,827,262
6v2              630             7,355,226,093,580,581
5v3            1,050            17,795,943,153,932,922
4v4              630            11,732,927,142,407,480
------------------------------------------------------
TOTAL          2,520           	38,176,306,877,748,245

Then, if we assume that intermediate and final sizes are more less proportional to NULP, the logical strategy looking for minimum storage during the generation task would be starting with the biggest subset of EGTB just to get rid of the bigger intermediate results earlier: firstly 5v3, secondly 4v4, then 6v2 and finally 7v1. I know, easier to say than doing it. Any insight is welcome.

Regards from Spain.

Ajedrecista.