Questions tagged [stockfish]
Stockfish is a strong open-source chess engine.
255
questions
13
votes
2answers
4k views
Why does Stockfish suggest h4 here?
Analyzing my latest game on chess.com, Stockfish says that h4 is the best move here:
I followed the line, but I failed to understand the reasoning of this move. Is it for some long-term advantage? ...
1
vote
0answers
59 views
Clear Stockfish hash table after every move conveniently
When analyzing a game with Stockfish I sometimes find it confusing that evaluation of a given position changes depending on what positions I had analyzed previously. I understand that this is because ...
5
votes
4answers
251 views
Why does Stockfish give an evaluation of +7.42 here?
[fen "r3k1nr/pppqn2p/5p2/b5p1/3PP3/1BP2QBP/PP1N2P1/R3K2R w KQkq - 3 14"]
This game was played by me on chess.com recently. (I am white). The material balance is +1 (for white). Then why is ...
1
vote
3answers
271 views
How good is 1. e4 c5 move for black? Why does Stockfish play it?
I've been running some engine vs engine games out of boredom and noticed Stockfish, when playing as black, 90% of the time played c7-c5 on white's e4. I've never actually seen a human play this, in ...
4
votes
2answers
184 views
Techniques used for Stockfish engine selectivity
Example puzzle (I'm sure there are numerous that fit this bill):
[FEN "rnbq3r/pppp4/3b1pkp/5p2/2BP4/4P3/PPP2PPP/RN1QK2R w KQ - 0 1"]
[Site "Earth"]
[White ""]
1. Qh5+ ...
1
vote
1answer
93 views
Detailed Stockfish Evaluation Function
Stockfish contains the nice 'eval' command that prints out the detailed score of its static evaluation function. It regards Mobility, Material, Bishop, Rooks, etc. However, I was wondering if there ...
0
votes
1answer
226 views
How do you make NNUE neural network for the newest Stockfish chess engine?
How can I make, for example, Stockfish 13 or 14 with a NNUE neural network? What is the precise procedure for making a NNUE neural network for some chess engine? I noticed that lichess.org uses ...
3
votes
0answers
37 views
Setting up Stockfish for Droidfish
I would like to set up Stockfish for the android app Droidfish. How do I set up a server for a Windows machine (my linux machine is too weak) using SF13?
2
votes
1answer
178 views
Where was Stockfish's fatal mistake in this game against Leela?
This is a game from the TCEC Season 18 superfinal, which Leela won with a beautiful positional bind.
[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]
[Event "TCEC Season ...
2
votes
1answer
122 views
How do I get Stockfish to write its analysis to a file using a batch file on Windows?
I can get this to work in a Windows Command Prompt window as follows:
stockfish_14_x64_modern.exe
uci
ucinewgame
position fen rnb1kbnr/ppp1pppp/8/3q4/8/8/PPPP1PPP/RNBQKBNR w KQkq - 0 1
go depth 17 ...
3
votes
1answer
194 views
Why does Stockfish evaluate this position as equal?
After solving the puzzle while I was analyzing this endgame, I was just surprised to see stockfish evaluates this position as equal.
After Ke4, Ke6 (Opposition); Kf4, and f5 -- I can't find out any ...
2
votes
1answer
199 views
Was there a bug in Stockfish similar to the bug in Houdini 6.02?
This is a follow-up question to Is Houdini 6 a Stockfish clone?
Houdini 6.03 included a bugfix: "Correction for incorrect detection of stalemate in positions with white pawn capture moves."
...
3
votes
3answers
179 views
Why does Stockfish evaluate this Lichess puzzle position as so advantageous for Black?
[Event "Rated Rapid game"]
[Site "https://lichess.org/tZI4OlZ3"]
[Date "2021.04.20"]
[White "Paulinos"]
[Black "Qedesh76"]
[FEN "r3qrk1/2pbbppp/...
5
votes
1answer
373 views
How do Stockfish levels work?
I read on some Lichess forum that Stockfish levels use limited computation time and search depth for lower levels. However, it seems like Stockfish also every so often inputs mistakes and blunders, ...
6
votes
1answer
493 views
How is Stockfish so fast?
I'm currently developing a bitboard-based chess engine for fun and can generate around 5.5 million positions per second on perft tests. I ran the same tests on Stockfish, which can do around 130 ...
3
votes
2answers
187 views
Does the Stockfish engine use past matches, or does it not need such a "database"?
I have a simple question. Does the Stockfish engine use, amongst the steps of its complicated algorithm, a library/database of past matches?
For such an algorithm to work, it would to need store many ...
4
votes
2answers
146 views
Looking for an opening where stockfish puts out a queen early
I am by no means a chess person (like 1200 haha). I am designing a computer science challenge where the player has to find a bug in my chess program to beat stockfish in a game of chess. The bug is ...
7
votes
1answer
335 views
How do computers end up blundering?
I’m trying some practice games against Stockfish level eight. I always lose but sometimes Stockfish makes obviously bad moves and I get ahead. Here for example, Stockfish makes an inaccuracy followed ...
2
votes
2answers
211 views
How can I load a position without kings into an engine?
I would like to be able to do load a position into a whatever possible (advanced) engine without kings. For example, the goal of the game would be to annihilate all the possible pieces instead of ...
5
votes
1answer
196 views
Obtain information about a a position from Stockfish
I want to know from Stockfish:
All possible moves in a position, a.k.a. a depth 1 analysis with no score.
If the king is in check, is checkmated, or if there is a draw.
The current FEN string, after ...
3
votes
2answers
198 views
Why doesn't SimpleEval's eval change in multiples of 1?
SimpleEval is Stockfish with simple eval - it only counts the material in the position and ignores all other evaluation factors like king safety or mobility. It is currently playing at TCEC.
If ...
1
vote
1answer
196 views
How to install stockfish on winBoard 4.4.5?
I want to install stockfish to winBoard 4.4.5. But winBoard 4.4.5 doesn't seem to have the same protocol as stockfish. Is there a way to do it on windows 10? I would like to install the latest version ...
0
votes
1answer
90 views
Unable To Communicate with UCI through Java Program
I am writing a java program to connect to the Stockfish Engine and get the best move for some FENs.
My Connection code is :
public class connector {
private Process engineProcess;
private ...
3
votes
1answer
743 views
Using Stockfish in Commercial Apps
Stockfish uses a GPLv3 license, which requires you to release your source code if you use it. This then makes your own code GPLv3. However, chess.com, chessable and decodechess all use Stockfish.
So, ...
0
votes
3answers
261 views
How to modify stockfish "skill" with python chess
I'm using this library and I couldn't find how to modify that value (skill).
In any case, what I want is to be able to vary the level of difficulty of stockfish using python chess.
Thanks.
1
vote
2answers
125 views
Stockfish shows only 2 next moves
For Position 1r2k1r1/pq1b1p2/1p1Rp1p1/2p1P3/2B2P2/P1N1K1P1/1P2Q3/8 b - -
stockfish analysis ouput is like
info depth 12 seldepth 17 multipv 1 score cp 258 nodes 80180 nps 76874 hashfull 14 tbhits 0 ...
19
votes
2answers
5k views
Is this a draw despite the Stockfish evaluation of −5?
I reached this position as Black:
[Title "Black to move"]
[FEN "8/8/8/3q4/6kp/7R/6P1/6K1 b - - 3 46"]
And I felt that I cannot make any progress and so it feels like a draw. ...
5
votes
0answers
230 views
Highest depth ever achieved
I saw a guy that went into depth 70 with no search moves at 41, 192, 897, 168, and 184 nodes from the starting position on Stockfish a few years ago.
I would like to know if this is still a record or ...
4
votes
1answer
261 views
Why is Bf8 a blunder in this position?
Here is an analysis of a game I played recently in Chess.com app. I won this match in move 19 as the opponent resigned.
Please see the image attached for the position. On move 16, after the White ...
2
votes
1answer
158 views
limit stockfish 9 to a specific range of ELO rating
I am using stockfish 9 for our chess game project, and I want to limit the ELO rating of the engine to a range. I saw attributes like movetime and depth are used to limit the engine skill level, but I ...
3
votes
3answers
320 views
Stockfish depth calculations
I'm using Stockfish to analyze my blunder filled games for blunders.
Let's say you send stockfish a FEN for a position and then calculate to a given depth ...
position fen the-starting-position
go ...
1
vote
2answers
141 views
Why was the engine giving such positive evaluations for my game with equal material?
I just played a game on chess.com that was roughly equal material until the final move (I was one pawn up for most of the game) but the engine favours my position to the extent that by move 12 I had a ...
5
votes
1answer
604 views
HalfKP Structure for Stockfish / Shogi NNUE - how does it work?
Stockfish now uses a neural network for position evaluation. The structure of this neural network was introduced for Shogi by Yu Nasu in the paper dubbed "Efficiently updatable neural network - ...
4
votes
1answer
91 views
Engines tuned to masters’s styles
I saw a stream by IM Eric Rosen where he showed a stronger version of stockfish than the one on lichess.org. He said that it is a version that is given to masters with the evaluation function ...
8
votes
2answers
2k views
Why is an early e5 against a Yugoslav setup evaluated at +2.6 according to Stockfish?
I was looking at analysis on one of my games and found this variation against a Yugoslav attempt against the Sicilian Dragon which Stockfish 12 instantly says is +2.6 for white:
[FEN ""]
[...
1
vote
1answer
223 views
Why does Stockfish NNUE flatline?
Flatline - to produce a flat evaluation curve.
As I understand engine chess, engines "flatline" in fortress positions. In these positions there are a lot of effectively-equivalent positions ...
2
votes
2answers
172 views
Why does stockfish suggest bishop pins on knights early on?
Stockfish suggests the following pin for me (white) against the queen on the night. However, whenever I play this move in real games black just kicks the bishop off with pawn to h6. I end up just ...
12
votes
1answer
4k views
Did Stockfish regress from October to December 2020? If so, why?
NCM data
If the NCM data is to be believed, somewhere around October 2020, Stockfish dev hit +370 elo vs. Stockfish 7, but has since regressed to only +360. What's going on?
Only thing I can think of ...
3
votes
1answer
271 views
How to interpret lines of play computed by Stockfish during annotations
I am learning how to use Stockfish to analyze my games, and I had a question on how to understand Stockfish's output.
Consider the screenshot when I request stockfish 12 to annotate my games inside ...
4
votes
0answers
90 views
Is there a mathematical way to determine whether going to depth n+1 would be x% likely to recommend the move at depth n?
I have a chess GUI which I've recently been updating to do preemptive searches (that is, depth searches for all possible opponent moves) that I'd like to speed up, since the bot searches go to at ...
1
vote
1answer
253 views
Is there any GUI for Stockfish which allows comments in macOS Big Sur?
Currently I use the built-in Stockfish app that's in the Apple Store. But unfortunately, I can't put comments in the moves. I would really appreciate it if you can give me good recommendations other ...
2
votes
1answer
744 views
How should I configure Stockfish if I want it to play as a 2800 ELO player without the UCI_LimitStrength value?
Stockfish has so many parameters that I'm not sure which one I should change so that it has a strength equivalent to that of a human who has 2800 ELO, well that's one of my wishes, the other is to be ...
5
votes
2answers
2k views
Why doesn’t Stockfish evaluate this fortress as 0.0?
I'm going through the 100 endgames you must know book on Chessable and stumbled upon something I don't understand. This position with white to move is described as a draw starting with 1. Kh1. I ...
2
votes
1answer
193 views
The best move in this Crazyhouse position according to Stockfish
I just played my first few games of Crazyhouse, and I really don't understand it. At one point I had this position.
[Title "White to move"]
[FEN "r2q1rk1/pbb2pp1/n1p1p2p/1p1nP3/2pPN3/...
1
vote
1answer
405 views
running stockfish with docker and docker-compose
I have access to a powerful computer at work so naturally I want to run a chess engine on it (stockfish for now and later leela). I am trying to use docker-compose to link a stockfish image and a ...
2
votes
3answers
192 views
Xboard and a remote engine
I want to analyse chess games with xboard and stockfish. Locally this is no problem.
But my PC is slow, so I have rented a faster linux server, and I want let stockfish run on it.
How can I use xboard ...
8
votes
3answers
4k views
How does Stockfish know if the king is in check?
I am writing a chess engine. I need to know how to tell if the king is in check. I was thinking that maybe I can use the approach that Stockfish uses. Where and how in Stockfish's code is check ...
2
votes
0answers
280 views
How to turn off Contempt in engine analysis?
I'm trying to analyze a game with the python-chess package, and for that I want to turn off the "Analysis Contempt" option in Stockfish. However, it seems it doesn't work, and I don't know ...
3
votes
3answers
1k views
Stockfish Evaluations
I've been getting Stockfish to analyse lines of the KID, and the evaluation gives a score of around +1.5: White has a big advantage. How come this is true, when the KID is a playable(and good) opening?...
4
votes
3answers
568 views
Book recommendation for chess engine building
This might be too broad a question, but can anyone recommend specific books that deal with chess engines, including hard-coded ones such as Stockfish, Komodo, and other ones also based on neural ...
