Search found 3628 matches

by jdart
Tue Jul 16, 2019 5:02 pm
Forum: Computer Chess Club: General Topics
Topic: Math question
Replies: 7
Views: 284

Re: Math question

You can view move selection as an example of the "multi-armed bandit" problem. You have a prior distribution of outcomes (win/loss/draw) and you are trying to optimize the future "payout" (score). There is a very large literature on this but one approach is called Thompson Sampling (https://en.wikip...
by jdart
Tue Jul 09, 2019 7:33 pm
Forum: Computer Chess Club: General Topics
Topic: Ferret 1.00 v258 - program from 1995
Replies: 36
Views: 3100

Re: Ferret 1.00 v258 - program from 1995

Ferret competed in quite a few tournaments from 1995-early 2000s, and it was active on chessclub.com. Some games are available here:

http://www.chessgames.com/perl/chessplayer?pid=30003
by jdart
Mon Jul 08, 2019 1:38 am
Forum: Computer Chess Club: General Topics
Topic: 7 Man Syzygy and SSD
Replies: 43
Views: 3783

Re: 7 Man Syzygy and SSD

Nordlandia wrote:
Sat Jul 06, 2019 5:54 pm
MikeB: if you have time please comfirm whether cutechess gui adjourn 7-piece positions.
It doesn't. See:

https://github.com/cutechess/cutechess/issues/499
by jdart
Fri Jul 05, 2019 12:16 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: syzygy / fathom
Replies: 6
Views: 380

Re: syzygy / fathom

Which Fathom are you using? Is it https://github.com/jdart1/Fathom? If the command-line tool works on your position, then you have to be passing something different into the API for it to not work for you. You do have to call tb_init first. Btw. the newer and now preferred root level probing API cal...
by jdart
Wed Jul 03, 2019 9:56 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Severe windows 10 problems. What to do?
Replies: 49
Views: 1395

Re: Severe windows 10 problems. What to do?

I wouldn't conclude it is software - could be your disk is failing/has bad sectors.

You could try to reinstall the OS from media. You might find this helpful (no guarantees):

https://www.intowindows.com/how-to-rein ... sing-data/
by jdart
Wed Jul 03, 2019 3:50 am
Forum: Computer Chess Club: General Topics
Topic: Arasan 21.4
Replies: 3
Views: 426

Re: Arasan 21.4

I noticed arasanx-64-bmi2.exe (BMI2 but non-NUMA build) was missing from the engine archive (arasan21.4.zip) so I updated it to include that.

--Jon
by jdart
Wed Jul 03, 2019 1:08 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: tuning for the uninformed
Replies: 64
Views: 13091

Re: tuning for the uninformed

Some King attacks are still not trivial for programs to execute, especially when there are quiet moves (zwischenzuegen) in the PV, or one or more sacrifices are involved.

--Jon
by jdart
Tue Jul 02, 2019 6:45 pm
Forum: Computer Chess Club: General Topics
Topic: Arasan 21.4
Replies: 3
Views: 426

Arasan 21.4

Arasan 21.4 is available from https://www.arasanchess.org Changes in Arasan 21.4: 1) Update to use latest Fathom library with 7-man tb support. 2) Use Fathom ranking API for tb moves at root. 3) Changes to extension logic. 4) Use IID score to improve eval value for pruning, as is done with hash scor...
by jdart
Mon Jul 01, 2019 11:33 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Linux flavors - opinions
Replies: 29
Views: 1465

Re: Linux flavors - opinions

If you're managing thousands of machines, then your nightmare is the failed mass upgrade, where you roll something out and then there are major problems. So these organizations delay updates, typically, letting somebody else have that problem and hopefully having it fixed by the vendor before they s...
by jdart
Mon Jul 01, 2019 5:44 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Exchange
Replies: 15
Views: 514

Re: Exchange

Generally speaking, when ahead, you want to exchange pieces but not pawns. Especially, you don't want to exchange away your last pawn, because quite a few material configurations with no pawns but more pieces are draws or drawish, notably Rook + minor vs. Rook. You also though need to tune any such ...