Search found 4011 matches

by jdart
Wed Jul 21, 2021 9:10 am
Forum: Computer Chess Club: General Topics
Topic: Stockfish: Our lawsuit against ChessBase
Replies: 247
Views: 10402

Re: Stockfish: Our lawsuit against ChessBase

leading developers of Stockfish have terminated their GPL license with ChessBase permanently Is this possible? You can sue someone to comply with the terms of the license. But since a FOSS license offers the software to anyone who complies, curing any violations should enable continued distribution...
by jdart
Sun Jul 11, 2021 2:19 pm
Forum: Computer Chess Club: General Topics
Topic: Gary Kasparov 58 Years old is no longer 2812 use your engine
Replies: 29
Views: 3779

Re: Gary Kasparov 58 Years old is no longer 2812 use your engine

Viktor Korchnoi kept up a high rating for a very long time, even as an old man. He was in the top 100 at age 75.
by jdart
Sun Jul 11, 2021 1:15 pm
Forum: Computer Chess Club: General Topics
Topic: Gary Kasparov 58 Years old is no longer 2812 use your engine
Replies: 29
Views: 3779

Re: Gary Kasparov 58 Years old is no longer 2812 use your engine

He scored only 0.5 points in the Croatian blitz tournament yesterday. But you have to remember, these are very strong GMs he is playing, including WC Candidate Nepomniachtchi, Grischuk, Giri, etc. And he's retired, and much older than they are. There are not a lot of players who could pop in and sco...
by jdart
Fri Jul 09, 2021 1:57 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Some more HCE "Texel Tuning" Data
Replies: 13
Views: 5058

Re: Some more HCE "Texel Tuning" Data

So I have this naive implementation of the Texel tuning and it seems to work (just a local search). I tried implementing the Adam optimizer but the default learn rate is very small. It takes forever to tune values. It's like 1 centipawn per 100 epoch. I use ADAM_ALPHA = 0.015 (initial learning rate...
by jdart
Mon Jun 21, 2021 10:52 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Engines compiled for Windows 10 | 11 ARM64 Neon
Replies: 19
Views: 6451

Re: Engines compiled for Windows 10 | 11 ARM64 Neon

I think that's pretty accurate. I have to say, I am extremely impressed by Apple managing back in the day to both switch its hardware platform (to Intel) and its OS layer (to Mach/MacOS) and not lose its customer base in the process: in fact, gaining market and share. That is usually not what happen...
by jdart
Sun Jun 20, 2021 8:55 pm
Forum: Computer Chess Club: General Topics
Topic: what is the most popular losing opening?
Replies: 8
Views: 1582

Re: what is the most popular losing opening?

Lots of openings are playable at the club level and some dodgy ones are used occasionally by strong players for surprise value. But computer and correpondence play have made a lot of suboptimal lines very risky. I think the Caro-Kann Advance for example is quite challenging for Black. Same with the ...
by jdart
Mon Jun 14, 2021 3:04 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Hitting a wall at ~1860 Elo
Replies: 40
Views: 10725

Re: Hitting a wall at ~1860 Elo

Recursive null move pruning is a big winner. Probably more so than history. It doesn't look like that is implemented, so far.
by jdart
Sun Jun 13, 2021 2:43 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Hitting a wall at ~1860 Elo
Replies: 40
Views: 10725

Re: Hitting a wall at ~1860 Elo

IMHO almost all weaker engines are also buggy. There is just no substitute for having correctness in all implemented features. Some of the basic things to check are correct perft results, and verify eval results are symmetrical when the board is flipped/side to move is swapped. I also now have unit ...
by jdart
Thu Jun 03, 2021 2:46 pm
Forum: Computer Chess Club: General Topics
Topic: Fastest way to find games that match a position in a large database
Replies: 9
Views: 1816

Re: Fastest way to find games that match a position in a large database

ChessBase does have indexes, they called these "Search Boosters." See https://en.chessbase.com/post/chessbase ... -in-action.

Btw. it helps enormously to have your ChessBase databases on a SSD, preferably an M.2 SSD.
by jdart
Wed Jun 02, 2021 5:02 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: A hybrid of SPSA and local optimization
Replies: 6
Views: 1838

Re: A hybrid of SPSA and local optimization

Arasan uses ADAM. Ethereal uses Adagrad. (Not with SPSA, standard implementation with gradient descent).