What was the last good Stockfish?

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karger
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Re: What was the last good Stockfish?

Post by karger » Sat Sep 28, 2019 7:55 pm

I have been playing against it and found it plays some very unusual combinations.

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Eelco de Groot
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Re: What was the last good Stockfish?

Post by Eelco de Groot » Sat Sep 28, 2019 8:46 pm

Thanks much for your feedback John. That is very good to hear!!
Debugging is twice as hard as writing the code in the first
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan

karger
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Re: What was the last good Stockfish?

Post by karger » Sat Sep 28, 2019 9:35 pm

Eelco , I have copies of all your past altered engines from here & the rybka forum & the long gone excellent toga developers discussion board and this one is by far your most interesting. Keep up the fine work. Karger

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Ovyron
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Re: What was the last good Stockfish?

Post by Ovyron » Sun Sep 29, 2019 4:03 am

Hold on, this doesn't make sense...

The version of Stockfish that is the last one with configurable parameters is the 20140517-2059 version, dated May 17 2014 from here.

The very next one is the 20140519-1224 version, dated May 19 2014 from here, which reads:
Retire current asymmetric king evaluation
and use a much simpler symmetric one.

As a side effect retire the infamous
'Aggressiveness' and 'Cowardice' UCI
options.
It also has Mobility, Pawn Structure, Passed Pawns, and Space settings removed.

So the history went that a few days before Stockfish 5 was released, that happened...

HOWEVER, Stockfish 5 is the 20140531-0716 version, dated May 31 2014, from here.

But Stockfish 5 has those settings back!

So what happened? Were the settings removed, and then added back, and then removed again? Does it turn out that 20140517 is not the last version with the settings on there? Was Stockfish 5 based on a version previous to 20140517? Does 20140531-2134 (next after S5) have the settings or not?

This all is extremely confusing, specially because I clearly remember that THE REASON I even have the 20140517 version is that Stockfish 5 didn't have the settings, so I went to search for the last version that did. So if Stockfish 5 always had the settings, not only do my memories of the events not match the past, they also don't make sense... (I'd have only looked for it when Stockfish 6 was released without the settings, and I'd have looked at the versions after Stockfish 5 :shock: )
Great spirits have always encountered violent opposition from mediocre minds.

carldaman
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Re: What was the last good Stockfish?

Post by carldaman » Sun Sep 29, 2019 7:46 am

It really looks like they took the settings out out, put them back in and took them out again. I have an old Stockfish Rockwood (RW) compile from late May 2014 that has the settings back in there. Very strange - I've always (mis?)remembered that they took them out and they were gone for good.

carldaman
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Re: What was the last good Stockfish?

Post by carldaman » Sun Sep 29, 2019 7:51 am

Eelco de Groot wrote:
Fri Sep 27, 2019 4:59 am
carldaman wrote:
Fri Sep 27, 2019 3:34 am
Were you able to download Bluefish anywhere? Is it available?
Sure, I can make it available, Carl :) See Bluefish BMI2 (Beta).
No guarantees it has "style" though. It's just a half hour work or so, not a real Stockfish variant or fork yet.
Well, you must be congratulated on this one, Eelco! Bluefish has got a savage attacking style, just from the changes you made. A much better playing style and personality than all the top engines!

I've run some test matches, but with little time available. I hope to be able to post some of its games when I get more free time.

Cheers! 8-)

carldaman
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Re: What was the last good Stockfish?

Post by carldaman » Mon Sep 30, 2019 6:44 am

I am posting a brilliant attacking masterpiece by Bluefish, featuring a great sac to leave Black positionally helpless, despite being up a (useless) piece. It is very typical and indicative of how it tackles every game.



Take a look at the key position below. The h-pawn has already been sacced much earlier, but now the coup de grace is about to arrive, and Black ends up virtually paralyzed.
Notice the interesting V-chain pawn formation which tends to show up in other games of Bluefish, which helps command both sides of the board.



A remarkable march to victory, imho. Big thanks and kudos goes to Eelco de Groot for making this gem of an engine available to us. It makes regular Stockfish & Co. look boring and obsolete. THIS is the pathway to the future of chess.

Carl :idea:

maxdeg
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Re: What was the last good Stockfish?

Post by maxdeg » Tue Oct 01, 2019 11:33 pm

@Ovyron - message on Rybka also refers :

The settings were removed in Stockfish 20140601-1137.
You can obtain the source code for all the older builds from here: https://nextchessmove.com/dev-builds It is source code only from the github, but I have compiled many builds without problems.



Image

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Ovyron
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Re: What was the last good Stockfish?

Post by Ovyron » Wed Oct 02, 2019 4:53 am

Thanks maxdeg, it remains a mystery that the settings were added back and then removed again.

Anyway, compiling is such a hassle that I think that'd be the end of the line for me. Providing a service like abrok to get compiles was greatly appreciated, while it lasted.
Great spirits have always encountered violent opposition from mediocre minds.

maxdeg
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Re: What was the last good Stockfish?

Post by maxdeg » Wed Oct 02, 2019 1:24 pm

Ovyron wrote:
Wed Oct 02, 2019 4:53 am
Thanks maxdeg, it remains a mystery that the settings were added back and then removed again.

Anyway, compiling is such a hassle that I think that'd be the end of the line for me. Providing a service like abrok to get compiles was greatly appreciated, while it lasted.
You have mail .. :D :mrgreen:

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