Search found 3815 matches

by jdart
Sat Jul 11, 2020 2:38 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: THE SSDF RATING LIST 2020-07-11
Replies: 3
Views: 223

Re: THE SSDF RATING LIST 2020-07-11

Is it possible to make the games available?

The link at http://www.ssdf.bosjo.net/ssdf.htm#games does not work.
by jdart
Fri Jul 10, 2020 12:32 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Questions on Razoring and Code Structure for Pruning
Replies: 23
Views: 573

Re: Questions on Razoring and Code Structure for Pruning

I don't get that. 'Very bad' here means below alpha minus a rather small margin? Because that is what it automatically boils down to: if only captures stand a chance to raise the score above alpha, you will only search captures, and prune all non-captures. No, there is an eval test, and the margin ...
by jdart
Thu Jul 09, 2020 6:42 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Question on Texel's Tuning Method
Replies: 14
Views: 543

Re: Question on Texel's Tuning Method

chrisw wrote:
Thu Jul 09, 2020 7:39 am
There’s a great deal of power in “averaging”.
See the Central Limit Theorem for some mathematical justification of this.
by jdart
Thu Jul 09, 2020 4:50 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Questions on Razoring and Code Structure for Pruning
Replies: 23
Views: 573

Re: Questions on Razoring and Code Structure for Pruning

Last is when I review other code from other engines, I see razoring and futility pruning performed when entering a node to search (before generating and looping moves) and I will also see futility pruning pre-move-make (within the move loop). Razoring as the term is commonly used is a pre-search pr...
by jdart
Wed Jul 01, 2020 10:29 am
Forum: Computer Chess Club: General Topics
Topic: Arasan 22.1
Replies: 11
Views: 664

Re: Arasan 22.1

fjpv wrote:
Wed Jul 01, 2020 10:02 am
Trying to download the Arasan 22.1 Windows installer and I receive a message 404 Error - Page Not Found.
Please try again - should be fixed now.

--Jon
by jdart
Wed Jul 01, 2020 12:58 am
Forum: Computer Chess Club: General Topics
Topic: Arasan 22.1
Replies: 11
Views: 664

Arasan 22.1

Arasan 22.1 is available from https://www.arasanchess.org . Changes in Arasan 22.1: 1) Remove potential passer scoring. 2) Tighten validation of hash/killer moves 3) Fix Resign threshold option (CECP mode) 4) Simplify lmp threshold computation. No longer different for PV. 5) Modify formula for lmp c...
by jdart
Sun Jun 28, 2020 4:14 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Syzygy 6 dtz problem
Replies: 3
Views: 330

Re: Syzygy 6 dtz problem

But the 6 dtz isn't read by the computer.
Not clear what program/interface you are using?
by jdart
Sun Jun 28, 2020 2:28 pm
Forum: Computer Chess Club: General Topics
Topic: Test position: Lc0 vs Stockfish, TCEC 18, game 65
Replies: 28
Views: 1218

Re: Test position: Lc0 vs Stockfish, TCEC 18, game 65

Several TCEC games have been featured on https://www.chesspublishing.com recently. Formerly they used to pretty much ignore computer games, but now the GMs writing their columns are paying attention.

--Jon
by jdart
Sat Jun 27, 2020 9:24 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Testing Search and Evaluation
Replies: 6
Views: 314

Re: Testing Search and Evaluation

Fixed-depth testing is not really an established method for eval tuning.

The standard way to tune eval parameters is the "Texel" tuning method, more properly termed logistic regression. Lots of discussion of that in this forum, if you search.

--Jon
by jdart
Mon Jun 22, 2020 9:23 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Java vs C. It's not like one would think.
Replies: 13
Views: 888

Re: Java vs C. It's not like one would think.

Obviously my experience is absurdly out of date, but I am curious what things are like now: not just whether one can get high-performance Java (one always could if one wrote everything in terms of primitives and arrays) but whether one can write at a high level of abstract and still get good perfor...