Questions tagged [stockfish]

Stockfish is a strong open-source chess engine.

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0answers
74 views

The efficiency of playing a random move in a game of chess [closed]

I would like to ask you whether you think my experiment possesses any value. The following experiment shows the competition between two chess engines. The black side is programmed to always play a ...
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0answers
109 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 ...
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1answer
190 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 ...
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1answer
60 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 ...
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3answers
196 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 ...
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2answers
125 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
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1answer
299 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 - ...
3
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1answer
81 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 ...
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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 ""] [...
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1answer
146 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 ...
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2answers
158 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 ...
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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 ...
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1answer
144 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 ...
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76 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 ...
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1answer
194 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 ...
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1answer
387 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 ...
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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 ...
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1answer
127 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/...
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1answer
213 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 ...
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3answers
106 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 ...
7
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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 ...
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0answers
179 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 ...
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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?...
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3answers
262 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 ...
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3answers
774 views

Does Stockfish NNUE have contempt implemented?

Per title. As I understand contempt, it's a setting in the eval function that adds a bonus for material remaining on the board. This makes the engine favor positions with more material (i.e. more ...
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4answers
540 views

Lc0 vs. Stockfish

Stockfish analyses many positions per second and chooses the best line. Lc0 is a neural network that immediately ignores moves which don't work, but is slower. However, somehow Stockfish is better. ...
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1answer
523 views

Unable to run Stockfish on Python

I know this isn't a programming forum, though it's chess-related, hence the placement on here. Basically, I'm trying to setup stockfish with Python on my PC. I installed it via pip install stockfish. ...
2
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1answer
90 views

What's the best way to get the top n engine moves?

I want to use python-chess to get the top 5 Stockfish moves from a given position with a numerical evaluation for each move. Is it more accurate to run the engine for 10 minutes with MultiPV=5, or to ...
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2answers
2k views

Three way fork-Why take the rook instead of the queen?

I just finished off a game and decided to do some analysis because I had a position that I was thinking about for a little bit. I ran the game through Stockfish and the move I was thinking about was ...
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1answer
1k views

What does Stockfish NNUE mean for Stockfish?

Apparently there was a major update to Stockfish recently such that it gained +50 elo (per regression tests). I'm told that the difference is coming from the new NNUE (efficiently updatable neural ...
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1answer
2k views

Stockfish is considering a move in a book by GM Mihail Marin as a blunder

In the book English opening volume 1 by Mihail Marin at this position [fen "3nrrk1/bppq2p1/p4p1p/2Pp4/1P1P3N/P1BQ2P1/5PKP/4RR2 w - - 2 21"] 1. Qg6 (1. Ng6) He suggests Qg6 whereas ...
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1answer
767 views

What does this paragraph about Stockfish's regression tests mean?

Source Point 5: Elo estimates of single patches (SPRT runs) typically come with large error bars. Take this into account when adding Elo estimates. Furthermore, Elo estimates of passing patches are ...
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2answers
160 views

Alphazero vs Stockfish

Is the particular ending really a draw? Someone may try will FinalGen , please? [Title "White to move"] [fen "8/1B2k3/p7/P6p/1n1p2pP/6P1/4KP2/8 w - - 0 1"]
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4answers
4k views

Why is White considered so much better in this position?

I'm not sure I understand why Stockfish considers White so much better here. A look at the two strongest lines for White by Stockfish doesn't really give me much intuition about what White is playing ...
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2answers
292 views

Which engine is better at Chess960-Stockfish or Leela?

It seems that TCEC has seen Stockfish and Leela go back and forth. It is probable that these days Stockfish is a little bit better than Leela. I was wondering, since it is different in Chess960, which ...
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3answers
279 views

Did Leela Zero miss a win in this position?

Did Leela Zero miss a win in this position from game 106 of the Computer Chess Championship, on move 83 with White to move? [FEN "8/2p1r3/2P4k/1P1pB2p/K2NbP1R/P5r1/8/8 w - - 0 1"] Here, ...
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2answers
186 views

Compiling Stockfish to disable own castling while allowing opponent castling

For artistic purposes, I would like to create and study engine games in which only one side is able to castle. For this, I need to compile a version of Stockfish which never castles, and doesn't ...
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1answer
177 views

How is AlphaZero defferent from Stockfish?

Obviously one is better than the other and AlphaZero uses machine learning and all, but what is the real reason for their different style of play? Given a position, both evaluate the next best move ...
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1answer
177 views

Why is stockfish not accepting my move?

I am trying to play with stockfish from terminal. I entered the following commands: position startpos e2e4 d The output was: Why is stockfish not accepting my move?
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0answers
44 views

Stockfish Transposition Table: 16 bit key equals 0 even if the key is found? [closed]

In Stockfish 11, they use the high 16 bits as key inside the cluster: const uint16_t key16 = key >> 48; // Use the high 16 bits as key inside the cluster This renders problem when key >> ...
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1answer
149 views

Mate In N algorithm-Lichess Computer Analysis

Is it possible to have the computer analysis report mate in 12 moves to only change that to mate in higher number of moves, like 15 for example, after it searches deeper?
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2answers
181 views

How to get static evaluation from Stockfish in case that a king is in check?

I am working on a program that should recognize the difference between human and computer players. For this purpose, I need some parameters. A part of them would be the individual values of the static ...
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7answers
6k views

Would an ensemble of chess engines beat the best one?

In many areas such as prediction and classification, ensemble methods tend to outperform individual methods. This made me wonder if it would make sense to pick a few of the top chess engines and work ...
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1answer
90 views

Probability of given position/piece configuration

I'm currently working on an image based FEN generator. I found a paper doing the same and they have used Stockfish to calculate the most probable piece configurations. Now I wonder if Stockfish has ...
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1answer
305 views

Which chess GUIs support the chess variants Atomic and King of the Hill?

I want to play against Stockfish offline because I'm going on a trip. I downloaded the compiled exe from GitHub since my laptop will have limited Internet connection. After loading it into the Arena ...
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1answer
111 views

Trapped Rooks: Does Stockfish penalize more if the king can't castle temporarily?

In this talkchess thread, they discuss trapped rooks and castling rights. In post #5, user @Lyudmil Tsvetkov posted: I would give at least some 10-15cps for temporary prevention of castling. Here is ...
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1answer
296 views

Using Stockfish in an automated way, for example, to analyze games in pgn format

I am looking for a way to use Stockfish for an automated analysis of games which I have in pgn format. Similar to Fritz/Chessbase's Blunder Check function I would like Stockfish (or any other UCI ...
3
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1answer
160 views

When Lichess analyzes a game, how deep does it analysis?

In reference to the request computer analysis feature, how how deep is Stockfish analyzing, such as looking 12 moves ahead?
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1answer
43 views

How do you manually set switches when you are compiling Stockfish in Visual Studio? [closed]

How do you manually set switches when you are compiling Stockfish in Visual Studio? In the type.h file it saids: When Makefile is not used (e.g. with Microsoft Visual Studio) some switches need ...
3
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2answers
170 views

Good against low-level humans but bad against low-level computer

I'm probably what you'd call an advanced beginner. I spend most of my chess time solving puzzles on Lichess, which tend to focus on midgame calculation, making beneficial trades, and finding ...

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