Search found 188 matches

by Sesse
Mon May 21, 2018 10:04 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Syzygy question
Replies: 11
Views: 1924

Re: Syzygy question

To be honest, not even DTM50 will always give the right answer, due to possible three-fold repetitions.
by Sesse
Tue May 15, 2018 9:58 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Ryzen 2 and BMI2?
Replies: 10
Views: 3164

Re: Ryzen 2 and BMI2?

Obviously an Intel-specific instruction will not be applicable to PowerPC, indeed.

FWIW, bsf maps fairly well to the ffs() call in POSIX.
by Sesse
Tue May 15, 2018 3:43 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Ryzen 2 and BMI2?
Replies: 10
Views: 3164

Re: Ryzen 2 and BMI2?

No, you'd have to use an intrinsic or inline assembler. The former is fairly portable across compilers; at least MSVC, GCC, Clang and ICC all tend to support the Intel intrinsic style (_pext_u64 in this case) with some coaxing.
by Sesse
Tue May 15, 2018 1:27 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Ryzen 2 and BMI2?
Replies: 10
Views: 3164

Re: Ryzen 2 and BMI2?

I wanted to use PEXT for a branchless UTF-8 parser, but unfortunately, the instruction is too slow for it to be a win over straight-up code. (I know others have tried and come to the same conslusion.)
by Sesse
Mon May 14, 2018 10:03 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: stockfish.exe marked by AVG free antivirus
Replies: 2
Views: 740

Re: stockfish.exe marked by AVG free antivirus

The generally accepted solution for this is to have the Stockfish team sign their binaries with some certificate. That is much more likely to get it whitelisted than anything else.
by Sesse
Mon May 14, 2018 9:59 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Syzygy question
Replies: 11
Views: 1924

Re: Syzygy question

What we need are clearly DTM50 bases :-)
by Sesse
Sun May 13, 2018 8:35 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: 7-men Syzygy attempt
Replies: 588
Views: 142541

Re: 7-men Syzygy attempt

syzygy wrote:
Sun May 13, 2018 1:15 am
The affected tables seem to be:
- KQBNvKQB (660 ply)
- KRRNvKRR (581 ply)
- KQBNvKQN (633 ply)
I've removed these from my mirror, and evidently, so has Lichess.
by Sesse
Sat May 12, 2018 8:20 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: 7-men Syzygy attempt
Replies: 588
Views: 142541

Re: 7-men Syzygy attempt

I'm not seeking donations at this point; in particular, it would seem inappropriate as long as others are donating time on really expensive hardware for free (and there is already the Lichess mirror).

Coincidentally, I see tablebase.lichess.ovh now points to a nice 7-man position :-)
by Sesse
Sat May 05, 2018 8:18 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: 7-men Syzygy attempt
Replies: 588
Views: 142541

Re: 7-men Syzygy attempt

syzygy wrote:I didn't expect that all this data was going to be mirrored so generously :D
Google evidently thought it should be mirrored some more, and Googlebot appeared at my doorstep to download tablebases… :-P

Now added robots.txt.
by Sesse
Sat May 05, 2018 8:16 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: 7-men Syzygy attempt
Replies: 588
Views: 142541

Re: 7-men Syzygy attempt

Imagine sesse probing 7-men syzygy, it will definitely be a big jump in analysis power. Do you plan/consider purchase SSDs large enough for probing 7-men WDL or multiple in raid 0? I don't plan to buy 10 TB worth of SSD, no. I currently have two SSDs as cache in front of my RAID-6 array, which cach...