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Stockfish 12 Released (Read 6500 times)

Pawnpusher Senior Member Offline I Love ChessPublishing! Posts: 273 Joined: 01/04/18 Gender:	Re: Stockfish 12 Released Reply #17 - 09/15/20 at 10:37:16	Post Tools	Print Post
	Well some people are interested in a 'pure" nn evaluation.


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JFugre Junior Member Offline I Love ChessPublishing! Posts: 89 Joined: 01/22/19	Re: Stockfish 12 Released Reply #16 - 09/14/20 at 18:30:38	Post Tools	Print Post
	Pawnpusher wrote on 09/09/20 at 10:50:06: You may be interested in something like Cfish which uses a pure nn evaluation. Stockfish 12 uses a hybrid eval sometimes nn and sometimes classic Stockfish eval. There are some eval differences between the two. Note that the one in Stockfish 12 is stronger, and that's why it is the default (and there's really no point in getting Cfish unless you want a worse/weaker engine). You basically don't want to run slow the neural network if you're already a queen up with no compensation for the opponent.


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Michael Ayton God Member Offline ‘You’re never alone with a doppelgänger.’ Posts: 1947 Location: durham Joined: 04/19/03 Gender:	Re: Stockfish 12 Released Reply #15 - 09/14/20 at 11:25:19	Post Tools	Print Post
	Thank you! Have made a note ...


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Pawnpusher Senior Member Offline I Love ChessPublishing! Posts: 273 Joined: 01/04/18 Gender:	Re: Stockfish 12 Released Reply #14 - 09/14/20 at 10:38:11	Post Tools	Print Post
	There is also a forum called outskirts they have lots of links to other engines and some discusssion, but not as in depth as Talkchess.


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Michael Ayton God Member Offline ‘You’re never alone with a doppelgänger.’ Posts: 1947 Location: durham Joined: 04/19/03 Gender:	Re: Stockfish 12 Released Reply #13 - 09/12/20 at 14:07:19	Post Tools	Print Post
	Thanks -- will take a look at Talkchess.


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Pawnpusher Senior Member Offline I Love ChessPublishing! Posts: 273 Joined: 01/04/18 Gender:	Re: Stockfish 12 Released Reply #12 - 09/12/20 at 10:42:02	Post Tools	Print Post
	You are right, I use Aquarium and Fritz and Fritz gives win draw lose pct. but Aquarium does not. Talkchess covers some of these issues.


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Michael Ayton God Member Offline ‘You’re never alone with a doppelgänger.’ Posts: 1947 Location: durham Joined: 04/19/03 Gender:	Re: Stockfish 12 Released Reply #11 - 09/12/20 at 07:58:30	Post Tools	Print Post
	Please forgive an even more ignorant question. I read online that 'classic' evaluation means one expressed in centipawns, and 'nn' one expressed as a percentage estimation of the stronger side winning the game. When I run Cfish in Arena, evaluations are given in the same way as for any other engine -- presumably, still centipawns(?) Am I right then in thinking the 'percentage' evaluation only diaplays in more modern GUIs, and if so, which? Of course, if anyone knows any good websites which explain all this, that'd be great to know!


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Pawnpusher Senior Member Offline I Love ChessPublishing! Posts: 273 Joined: 01/04/18 Gender:	Re: Stockfish 12 Released Reply #10 - 09/10/20 at 10:35:48	Post Tools	Print Post
	NN eval is just the net's evaluation. Hybrid is mostly the net evaluation mixed with "classic" hand written Stockfish eval. Classic is only the Stockfish hand written evaluation. There are a few places to find Cfish just ask Google .


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Michael Ayton God Member Offline ‘You’re never alone with a doppelgänger.’ Posts: 1947 Location: durham Joined: 04/19/03 Gender:	Re: Stockfish 12 Released Reply #9 - 09/10/20 at 07:27:18	Post Tools	Print Post
	Quote: You may be interested in something like Cfish which uses a pure nn evaluation. Stockfish 12 uses a hybrid eval sometimes nn and sometimes classic Stockfish eval. There are some eval differences between the two. Interesting. Could you explain for an ignoramus like me what these different evaluation types are? Where should I go for the latest version of C-fish, or any other of these engines? I did once download a few such things (Raubfisch, etc.), without having the least clue as to what they actually were!


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Pawnpusher Senior Member Offline I Love ChessPublishing! Posts: 273 Joined: 01/04/18 Gender:	Re: Stockfish 12 Released Reply #8 - 09/09/20 at 10:50:06	Post Tools	Print Post
	You may be interested in something like Cfish which uses a pure nn evaluation. Stockfish 12 uses a hybrid eval sometimes nn and sometimes classic Stockfish eval. There are some eval differences between the two.


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Michael Ayton God Member Offline ‘You’re never alone with a doppelgänger.’ Posts: 1947 Location: durham Joined: 04/19/03 Gender:	Re: Stockfish 12 Released Reply #7 - 09/08/20 at 21:18:00	Post Tools	Print Post
	Quote: Apologies to Michael for the misleading suggestion. No probs whatsoever! I'm just grateful to be able to learn from all the insightful discussion. I've installed the AVX2 version and its working fine (I use Arena) -- thus far, some interesting subtle evaluation differences from SF 11's ...


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Seeley Senior Member Offline Posts: 352 Location: UK Joined: 04/03/10	Re: Stockfish 12 Released Reply #6 - 09/08/20 at 16:56:49	Post Tools	Print Post
	JFugre wrote on 09/08/20 at 16:42:46: The main concern for BMI2 is that Zen chips support it but are very slow at it, so for Zen you want the AVX2 build (which won't have BMI2). That's also what the table on the Stockfish site says. Having followed the link to Wikipedia and read the note at the bottom, I see what you mean. Higher up, it says that for Zen-based processors, BMI2 is supported, and I stopped reading there. This really isn't at all straightforward for those of us with rudimentary IT understanding! Apologies to Michael for the misleading suggestion.


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JFugre Junior Member Offline I Love ChessPublishing! Posts: 89 Joined: 01/22/19	Re: Stockfish 12 Released Reply #5 - 09/08/20 at 16:42:46	Post Tools	Print Post
	BMI2 is not really related to AVX2 - you can have a build with both. The main concern for BMI2 is that Zen chips support it but are very slow at it, so for Zen you want the AVX2 build (which won't have BMI2). That's also what the table on the Stockfish site says.


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Michael Ayton God Member Offline ‘You’re never alone with a doppelgänger.’ Posts: 1947 Location: durham Joined: 04/19/03 Gender:	Re: Stockfish 12 Released Reply #4 - 09/08/20 at 10:57:04	Post Tools	Print Post
	Quote: AVX2 is considered better by the folks on computer chess fora. Thanks v. much! Thanks, Seeley, too! BMI2 isn't in the instructions I get when I run CPU-Z, but maybe that doesn't matter?


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Seeley Senior Member Offline Posts: 352 Location: UK Joined: 04/03/10	Re: Stockfish 12 Released Reply #3 - 09/08/20 at 10:56:29	Post Tools	Print Post
	Michael Ayton wrote on 09/08/20 at 10:16:19: I want to install this on an Asus ZenBook UX305. I have the instructions SSSE3 and AVX2, so I imagine I should choose one of these versions from the site. But am I right, and if I am, is either preferable? I went to this download page: https://stockfishchess.org/download/ where the various options for download are listed, as far as I can tell, in descending order of speed. My laptop is now nearly five years old, but I found it was able to run the one at the top of the list (BMI2), so I would've thought your Zenbook would be able to manage that too. At the link I've posted, it says "If you don't know which CPU you have, you can go down the list and pick the first binary that does not crash." There's a way you can run a test to check this, but I don't have the instructions for that in front of me at the moment. If you'd like me too, though, I can post them later for you.


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