Scorpio 6men EGBB Now available

[Daniel Shawul]

Joshua, I noticed that you named the egbbs version 3.0 but it is 4.0 for the 6 men. Also could you please replace the 5 men v3.0 with the new 5men v4.0 from here http://shawul.olympuschess.com/egbb/egbb5men.7z . They are a bit smaller and old engines still work with them.

[beachknight]

Thank you Josh and Daniel.
Best,

[jshriver]

I fixed the name for the 6men set. Will grab the new 3-4-5men set and torrent it.

My host is doing server maintainance so my server will be down for a couple hours. Will try and get it all sorted tomorrow, and put the new 3-4-5 up on the torrent site.

-Josh

[jshriver]

Daniel it appears the egbb5.7z is corrupt. I've tried grabbing it from the web and via scp and still getting errors on extraction.

Can you verify?

[Daniel Shawul]

It seems to work for me but HG also had similar problems with the .7z file. I replaced the .7z file with a new .zip file.
Thanks

[Daniel Shawul]

So far I have ignored enpassant but now it seems that it is time to add enpassant square to the probing code. I want to do this before engine authors upgrade to probe_egbb_xmen which doesn't accept epsquare right now. Positions like below are currently misevaluated by scorpio which happily plays h5! I will change this to treat positions with epsquare as broken and resolve them by making the enpassant move instead.
[D] 8/3k3p/8/6P1/1K6/8/8/8 b - - 0 1
Current

Code: Select all

typedef int (CDECL *PPROBE_EGBB) (int player, int* piece,int* square);

I can use it as it is by appending square[] last element to be epsquare. That way atleast anyone who have already implemented it ( probably none right now) doesn't get affected. But I prefere the explicit

Code: Select all

typedef int (CDECL *PPROBE_EGBB) (int player, int* piece,int* square,int* epsquare);

@Joshua, I will update the egbbdlls and egbbso with this new modification. I think that will affect your md5 sums. Is it better to offer those as separate download? I don't like these because people will then forget to download them and give me headaches about engine not loading bitbases ...

[Martin Thoresen]

Joshua, I noticed that you named the egbbs version 3.0 but it is 4.0 for the 6 men. Also could you please replace the 5 men v3.0 with the new 5men v4.0 from here http://shawul.olympuschess.com/egbb/egbb5men.7z . They are a bit smaller and old engines still work with them.

Daniel,

I don't know if you remember our email exchange a while back but you recommended me to disable access to Scorpio bitbases if using many cores (like the TCEC server using 16) since I experienced crashes. I think you said this was because of non-optimization for multiple threads in the bitbase code (or something).

So my question is, is this fixed with these new dll's and 5-men?

Best,
Martin

[Daniel Shawul]

@Martin,
Unfortunately I forgot to increase the number of processors from 8 to 16 again. I will compile the dlls to work with 16 cores and give you a link to it later. For testing , I will also compile a new Scorpio version that supports the new 6-man bitbases but ofcourse you don't have to download all those but just the 200MB 5 men.

[Martin Thoresen]

@Martin,
Unfortunately I forgot to increase the number of processors from 8 to 16 again. I will compile the dlls to work with 16 cores and give you a link to it later. For testing , I will also compile a new Scorpio version that supports the new 6-man bitbases but ofcourse you don't have to download all those but just the 200MB 5 men.

Great, thanks a lot. Please let me know when it's available.

[Daniel Shawul]

Here is a compile of egbbdlls for upto 64 processors. Extract and replace the four egbbdll and egbbso files with these one.
http://shawul.olympuschess.com/egbb/egbbdll.zip
And a scorpio version that can use them
http://shawul.olympuschess.com/egbb/Scorpio.zip
And the new 5-men egbbs can be downloaded here.
http://shawul.olympuschess.com/egbb/egbb5men.zip
Note that the egbbdlls that comes inside this 5men package do not work on more than 8 cpus so replace them with the above that work for upto 64 cpus.
Please let me know if you find problems.

Edit I made it sound like only Scorpio can use the new ones but old engines can also use them. So just delete the old 5-men files you already have and use the new ones. This only to allow newer Scorpio versions to use egbbs, because it can not use the old ones. I did this deliberately to force testers to download new egbbs