Questions tagged [stockfish]

Stockfish is a strong open-source chess engine.

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3 votes
1 answer
2k views

How to use the Ponder option in stockfish / UCI

I'm trying to understand stockfish Ponder functionality. I'm very interested to let stockfish think when the opponent is thinking. From what I understand you can do it as follows $> uci $> ...
12 votes
6 answers
1k views

Why does Fishtesting test Stockfish against itself, not other engines?

As I understand the so-called Fishtesting, people write patches, then try the patches against the current version of Stockfish. If the new version performs better, it's promoted to be the main version;...
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6 votes
1 answer
1k views

Are there any attempts at writing Stockfish MCTS?

As of time of writing, there is one major traditional engine using Monte Carlo Tree Search for its search algorithm - Komodo. The MCTS version of Komodo started out weak but gained strength quickly, ...
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1 vote
1 answer
774 views

Why does NCM show no progress for Stockfish when each new version has to beat the previous version?

NCM plays each Stockfish dev build 20,000 times against Stockfish 7. This yields an approximate Elo difference and establishes confidence in the strength of the dev builds. As of time of writing, one ...
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-4 votes
2 answers
134 views

Stockfish 9 giving erroneous reading

Sam Loyd, 1860 [fen "8/8/8/8/B6n/7p/6k1/4K3 w - - 0 1"] 1.Bd7!! h2 2.Bc6 Kg1 3.Bh1!! Kxh1 4.Kf2. (Ke1, Ba4; Kg2, Nh4, h3) says mate in 54 after 1.Bd7!! h2 2.Bc6 Kg1 3.Bh1!! Kxh1 4.Kf2. This is a ...
5 votes
1 answer
260 views

Combining AlphaZero methods with Stockfish methods [closed]

NOTE: I asked a similar question at the ai stackexchange, but didn't get any satisfying answers, so I will post an updated version of the question here, to see if someone with more of a chess ...
0 votes
1 answer
418 views

Standard for current position evaluation via UCIs

I am trying to interact with stockfish via UCI to get a current evaluation of the board. When you do a simple position startpos go depth 10 The board will helpfully return ...[previous depths] ...
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6 votes
3 answers
882 views

Solvable studies that computers fail to crack

Are there chess studies that require an outside of the box thinking that goes beyond the concrete calculation capabilities of today's engines (e.g. Stockfish)? I have sometimes seen certain endgames ...
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6 votes
2 answers
477 views

Not in stalemate, but why is this a draw?

I was practicing with stockfish level 8, having two rooks in the endgame whereas stockfish has only one. At the 78th move, it was declared as a draw. But, it was not a stalemate. Can anyone please ...
4 votes
1 answer
346 views

How does Stockfish ensure an incremental change made is beneficial?

Does Stockfish's testing framework get the new engine to play the old engine many times in a match? Since Stockfish thinks on each move according to a time limit (and not a depth limit, which gives a ...
2 votes
2 answers
328 views

Most complicated mode for chess engines

I have used many chess engines, especially Stockfish and I want to ask you, if it possible to change its mode to the most complicated one. What I mean: Now, most engines work as following: 1) Mate ...
7 votes
3 answers
3k views

Why are Leela's fans so passionate? [closed]

The neural-network engine Leela is a relatively new one. It's also got some extremely passionate fans. For example they write things like this: Wait 5-6 months, and we will see SF8 on uber-duper ...
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2 votes
2 answers
432 views

AlphaZero and the revenge of the Artificial Intelligence

Answering this question, @SmallChess offered this answer: Before Google's chess journey, the chess engine community believed: AI chess will not beat classical programming because neural networks ...
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4 votes
3 answers
901 views

Why does AlphaZero evaluate on the order of 1000 times less moves than Stockfish?

According to Deep mind's article, Alpha Zero searches roughly 10,000 moves per decision, while Stockfish is around 10,000,000 moves. I'm aware that Alpha Zero uses Monte Carlo Tree Search while ...
0 votes
1 answer
488 views

Importing and analysing games played on chess.com [closed]

How to import entire game from chess.com game to stockfish?
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13 votes
3 answers
5k views

What is 'Depth' in Lichess game analysis?

I have started analyzing my games in Lichess. I'm wondering what does Depth mean in the Stockfish analysis?
0 votes
1 answer
324 views

Is any tool which allow analyse EPD file and add evaluation score per I want specify depth/multi PVL?

I tested some tools which allow analysis EPD files but they not work like I want: I can use Arena but it will not annotate back EPD - it create protocol file. I can use SCID vs PC but it will not ...
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2 votes
1 answer
2k views

How to use nodestime option in Stockfish 10?

By looking at the uci option file of Stockfish 10 I found this line: o["nodestime"] << Option(0, 0, 10000); How exactly does one use nodestime?
2 votes
4 answers
737 views

Why is Stockfish giving me this weird move?

When I ask for the best move for this FEN: 1rbq1rk1/b4p2/p2p3p/3Bp3/P3P3/2P4P/R2Q1PP1/4K2R w -- - 0 30 [FEN "1rbq1rk1/b4p2/p2p3p/3Bp3/P3P3/2P4P/R2Q1PP1/4K2R w - - 0 30"] Stockfish (via Python) ...
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4 votes
1 answer
1k views

Oscillating Stockfish Evaluation on Laptop

I'm using stockfish-9-bmi2 on my laptop to provide me move by move evaluation of games. I've set Stockfish to evaluate to depth = 25 plys. I find that the evaluation provided oscillates move-on-move ...
4 votes
2 answers
606 views

What's the rationale behind chess engines conditionally allowing threefold repetitions when assigning a draw score?

When a chess engine sees a position p repeated once (i.e. position p occurred twice) it immediately assigns the second occurrence of position p a draw score. This makes sense because position p doesn'...
4 votes
1 answer
288 views

Why Stockfish 9 fails to see the draw?

I can reach a draw with White in the below position. The Stockfish 9, however, gives 28.1 points for black after Kf3,Ba1,Ke4,Bb2,Kd3. [FEN "8/p7/kpP5/qrp1b3/rpP2b2/pP4b1/P3K3/8 w - - 0 1"] 1. Kf3 ...
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1 vote
2 answers
290 views

Android Stockfish communication works differently than on PC? [closed]

How is number of threads to use written on Android versions of Stockfish? Whole communication works but somehow I still can't change number of threads. I even have working code for PC version of ...
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1 vote
3 answers
912 views

How many moves out do the static board evaluations use?

These days many online chess websites offer a board evaluation rating, often a bar, sometimes a number, sometimes both, as is the case here (see two red circles): Black will take a pawn soon, so the ...
4 votes
5 answers
1k views

Reasonable engines to test against (Not StockFish)

I've built a chess engine in Python which I've been testing against StockFish through the use of the Python-Chess package. Testing against StockFish seems/is problematic, and as a result I'm ...
-8 votes
1 answer
2k views

LICHESS analysis, why did it propose this outrageous move? [closed]

I was playing a game on lichess, and afterwards asked for a computer analysis, where instead of my perfectly fine move XX the computer insisted on another better move YY, why is that, how can I ...
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5 votes
1 answer
525 views

How are chess engines able to rank a Mate in X above a Mate in X+Y?

According to an engine, a mate in X moves = +infinity, since it is a forced win for it. Also according to an engine, a mate in X+Y moves = +infinity, since it's a forced win (just more moves, but an ...
1 vote
1 answer
283 views

Is there a way to get MANY and FAST (but not deep) position evaluations in javascript?

I am working on a statistical chess project that needs to evaluate many (about 20-30) different positions per turn. They do not need to be deep but fast. Is there a possibility to use engines (...
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6 votes
1 answer
2k views

Why does Stockfish give a negative score in a theoretical win for white?

8/3k4/8/3K4/3P4/8/8/8 b - - 0 1 (Black to move) This is a theoretical win since White has the opposition and the king is in front of the pawn. I have downloaded the Windows version for Stockfish 9 ...
0 votes
2 answers
313 views

Why Qd1 is the best move?

As per subject, why Qd1 is the best move and all other moves for queen like Qd2 and Qd3 are not? I understand that it’s important to cover d column but why 1 and not 2 or 3? Also why Rd1 is not a ...
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18 votes
8 answers
8k views

Why is exchanging the queens bad in this position?

Stockfish gives +6.6 to the following position. The recommended move by stockfish is Rc1 which maintains +6.6 advantage but if I exchange the queens right away (Qxd6), stockfish gives me +5. What's ...
3 votes
1 answer
274 views

What kind of hand-crafted features do top performing family of engines use to evaluate a position?

AlphaZero paper which introduced the engine which allegidly outperformed stockfish mentioned the following: These programs evaluate positions using features handcrafted by human grandmasters and ...
2 votes
1 answer
714 views

analyse and store a annotated game by stockfish in scid

Salut I installed scid and set all necessities in order to make an analysis by stockfish, but I could not find the option to save the done analysis. My question is just silly but I cannot find ...
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6 votes
3 answers
1k views

Why does Stockfish prefer White here?

My analysis of the position: Materially, black is a pawn up. White's rooks and bishop are active. White has potential counterplay on Black's Kingside but I think it can be defended by the move Ng6. ...
4 votes
1 answer
211 views

Output whether the best move is "much better" or only "slightly better" than the other moves

On Oct 31, 2014, Tord Romstad wrote: The moves are not searched in descending order from best to worst. Stockfish has no idea which move is the second, third best, etc., and it doesn't have any ...
2 votes
3 answers
12k views

What is the Elo rating of Stockfish version that played AlphaZero?

AlphaZero has defeated Stockfish with all novelties and brilliant strategic sacrifices. But some people were disputing its win, because Stockfish was running on weak hardware (1 GB RAM), not access to ...
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5 votes
5 answers
2k views

Custom chess (game) engine

Is there a chess engine which you can use regardless of the game's rules? For example, I want to create my own chess version in which queen will also be able to move as knight, or just a 10x10-square ...
4 votes
6 answers
26k views

Is it really possible to beat a stockfish level 8 computer in any time that is between 3+0 and 15+0?

I've watched a couple of games where people play against stockfish level 8 on lichess, and they pretty much lose all the time. Is it possible for someone to beat a level 8 computer in any time between ...
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22 votes
2 answers
4k views

Stockfish blunders away a piece

Using stockfish_8_x64 with Arena 3.5.1, I see a weird pick by Stockfish. Start here: White, Stockfish, to move. It plays bb6-g1,losing the bishop and the win. Also strange: the same engine ...
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4 votes
2 answers
4k views

Is there a list of hidden/deleted Stockfish commands?

I have downloaded the latest version of Stockfish, and I am running it on the command line. There is a hidden command 'd' which displays the current board. Also, the "debug on" command is not ...
-1 votes
1 answer
501 views

Stockfish crashes on fen string

I have created a GUI that communicates with a Stockfish 8 engine by passing it a FEN string. Everything works nice but on some specific FEN strings, Stockfish crashes. I don't have any clue why... ...
2 votes
1 answer
853 views

Is it possible for stockfish to tell that mate is in X moves, when mate is in X + Y moves?

I know that it is possible for a chess engine to evaluate a position as mate in X moves, when in fact there exist a mate in smaller number of moves. But can the reverse situation happen? For example ...
31 votes
7 answers
19k views

Hardware used in AlphaZero vs Stockfish match

I understand that AlphaZero has to use a different kind of hardware than regular Stockfish. I would expect that the hardware has a large effect on engine strength. That's why I wonder whether there ...
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43 votes
11 answers
23k views

How is Alpha Zero "more human"?

I have a possibly naive question about AlphaZero. I have seen it described as playing in a "more human" style than other computers, but whatever it does, it gains about 100 ELO points by doing it. ...
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36 votes
2 answers
8k views

Understanding AlphaZero

Very recently, the news came out that Alphabet's DeepMind research team have extended their machine learning engine to play both Shogi and chess. Apparently, after only a few hours of self-learning, ...
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4 votes
1 answer
1k views

Stockfish is cheating?

I am using the Arena GUI to run Stockfish. I set up the following position. [FEN "r2q1rk1/2p1bppp/p1n5/1p1pP3/3Pn3/1P3N1P/1P3PP1/RNBQR1K1 w - - 0 11"] [SetUp "1"] At a search depth of 16 half moves ...
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10 votes
1 answer
3k views

Do Stockfish and the tablebase work together or independently?

I use Arena GUI together with stockfish in engine games. I want to download a 6-piece tablebase but that is just a lot of work (and perhaps unnecessary). If I download the tablebase (syzygy), does ...
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1 vote
1 answer
504 views

Meaning of ! and ? in Stockfish output?

I've just installed Stockfish 8 and in the engine output, I see it has started to put ! and ? in various places (after certain moves and scores). Example output: mover viewpoint fewer / ...
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2 votes
2 answers
2k views

Stockfish perft displays reversed game notation?

I'm debugging my engine using Stockfish, and I suddenly notice a massive difference between mine and Stockfish. Board and fen string +---+---+---+---+---+---+---+---+ | r | n | b | q | | k | | ...
-1 votes
1 answer
644 views

Difference in chess engine strength for ''high end 64-bit multicore PCs'' vs. ''low end multicore 64-bit PCs''

I use Arena for tournaments between chess engines. The interesting thing is that in different 64-bit multi-processor computers ranking is slightly different. I was expecting that they should be the ...
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