Questions tagged [stockfish]
Stockfish is a strong open-source chess engine.
194
questions
1
vote
0answers
65 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, ...
2
votes
2answers
80 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 ...
-2
votes
1answer
87 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 ...
1
vote
1answer
70 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?
2
votes
0answers
22 views
Stockfish Transposition Table: 16 bit key equals 0 even if the key is found?
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 >> ...
1
vote
1answer
82 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?
3
votes
2answers
81 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 ...
24
votes
7answers
5k 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 ...
3
votes
0answers
46 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 ...
4
votes
1answer
90 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 ...
4
votes
1answer
100 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 ...
1
vote
1answer
63 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
votes
1answer
76 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?
1
vote
1answer
37 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
votes
2answers
131 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 ...
5
votes
1answer
181 views
Is there a list of approximate ELO ratings for each Stockfish level?
I want to create something that will select an appropriate Stockfish difficulty setting automatically given the player's rating. The straight Stockfish v11 that I've downloaded has 20 difficulty ...
21
votes
3answers
3k views
Why doesn't Lichess' Stockfish suggest this bishop sacrifice?
I arrived at the following position in an online game after the opponent left a queen hanging.
[FEN "r1b2r2/pp1p1ppk/2n1p3/6B1/2P5/5N2/PQ3PPP/R4RK1 w - - 0 16"]
In the game, I played 16. Bf6 with ...
5
votes
0answers
81 views
Move evaluation on armageddon games
I am wondering if there is a Stockfish-like evaluation of moves that could take in account armageddon rules, the rules being that you lose if you draw.
I would imagine a strategy of just trading ...
4
votes
1answer
286 views
Which is better-Stockfish 10 or AlphaZero?
I know AlphaZero (an AI) is one of the best top chess engines but Stockfish is also improving. Which one is better at chess? Also is there a new Stockfish level?
1
vote
1answer
162 views
Mate-in-10 that Stockfish missed!
Stockfish 10+ at depth 19 evaluated this position as a draw:
[Title "White to play and mate in 10"]
[FEN "r1b2r2/5pk1/pq2p3/1p5Q/3p1P2/P2Rn1NP/1P4P1/7K w - - 0 28"]
However, it is actually checkmate ...
2
votes
2answers
62 views
Is there a hash or string that represents a stockfish evaluation of a position to a certain depth?
Is there a hash or string that represents a stockfish evaluation of a position to a certain depth? For example for a given FEN, can you analyze to a depth of say 10 and get a hash to represent that ...
4
votes
1answer
71 views
Help me choose hardware configuration
I am preparing to buy a new desktop computer.
I would like to use it for chess analysis with both StockFish and Lc0.
My budget is slightly above 2K euros.
QUESTIONS:
This is my first time ...
5
votes
2answers
172 views
Stockfish draw value randomization and “3-fold blindness”
In this commit, a change was made to the way Stockfish scores board positions that are draws due to 3-fold repetition or 50-move limits. Prior to this commit, a drawn position was assigned a score of ...
29
votes
4answers
5k views
Why does Stockfish undervalue pawns when compared to the classical “a piece is worth three pawns” approach?
I was taking a look at values engines give to pawns and piece and was quite shocked by Stockfish values for middlegame (Mg):
PawnValueMg = 128
KnightValueMg = 721 ~ 5.6 pawns
BishopValueMg = 825 ~ ...
3
votes
1answer
138 views
How to understand Stockfish’s source code?
I am a newbie. I want to code a chinese chess engine, and I want to modify Stockfish source code to do so. But the Stockfish source code is too hard to understand. There are no document to explain ...
1
vote
0answers
43 views
How can I set up xboard with an engine in Linux?
I'm trying to use xboard in Fedora and have only been able to get it to work under very specific circumstances.
I installed it through my package manager and installed Stockfish as well. Without ...
1
vote
1answer
51 views
Stockfish: different nodes numbers with identical calls
I ran Stockfish 2 times with the command go depth 1.
First time
info depth 1 seldepth 1 multipv 1 score cp 114 nodes 20 nps 10000 tbhits 0 time 2 pv e2e3
Second time:
info depth 1 seldepth 1 ...
5
votes
2answers
143 views
What makes a move “weird”?
I am not sure if this question has been asked before, but I recently had a friend, who is a NM, play a blitz match against stockfish (level 12 I believe) and commentate its playing style. What struck ...
1
vote
2answers
144 views
Using the Stockfish move generator in a home chess engine
Basically, I’m creating a chess AI and I want to focus on the search algorithm rather than the most complete way or fastest move generation portions. So, for now, I was thinking I could use a prebuilt ...
14
votes
3answers
2k views
Is Houdini 6 a Stockfish clone?
I've been hearing this claim being bandied about quite a lot and I'm wondering if there's any substance to it. Apparently the details are in a certain thread on Talkchess, but it's not viewable to non-...
2
votes
1answer
85 views
Lichess' Stockfish's tuning
I remark that whatever the level of the Lichess' Stockfish I choose it plays in average at the same speed. How could I tune my Stockfish (the one I use in Fritz or Arena) to achieve the same with the ...
10
votes
3answers
3k views
Why does Stockfish suggest capturing a bishop in this position when my opponent can fork my king and rook?
The position in question is:
[FEN ""]
[StartPly "13"]
1. d4 c5 2. Nf3 cxd4 3. Nxd4 Nc6 4. Nc3 e5 5. Ndb5 Bb4 6. Bg5 Bxc3+ 7. bxc3 Qa5 8. Qd5 Nge7 9. Nd6+ Kf8 10. Qxf7# 1-0
It's black turn and the ...
2
votes
5answers
287 views
How can I use stockfish to find good moves, instead of just bad moves?
After playing on lichess.org I have been reviewing my games as follows:
Ask for a computer evaluation (Stockfish)
Look at the graph and investigate any wild swings in computer analysis
Try to ...
2
votes
1answer
182 views
Communication with Stockfish engine via Python
I try to access the Stockfish engine via Python, but only get bestmove = a2a3.
If I enter the same commands into the MAC-terminal, the engine calculates the correct move.
Can anyone help me, please ?...
9
votes
5answers
1k views
Level the field when letting computers play against each other
I just read this question and it made me wonder: when setting up such a game/comparison - shouldn't you try to level the computing capacity field? Or at least limit how much energy each "player" is ...
9
votes
3answers
1k views
Knowing that AlphaZero beat Stockfish 8 (28 wins, 0 losses, and 72 draws), what would AlphaZero's rating be?
I found three different questions here on SEC that asked what Stockfish 8's rating was for the match against AlphaZero, but none that asked what AlphaZero's rating should have been after (if it had ...
1
vote
1answer
177 views
How does Stockfish calculate advantage? [duplicate]
Recently when I was on Lichess, somebody pointed out in chat that Stockfish calculated advantage based on what it considered as the best move for both sides. However, when we play the best moves (...
31
votes
7answers
16k views
Is Stockfish 11 (level 20) beatable?
I have heard many people saying, “Hah! I beat Stockfish,” and one saying, “I am the best chess player ever! I beat Stockfish.” So I wonder if it is possible, just to know whether I should try to beat ...
6
votes
4answers
1k views
How do I understand White's +6 advantage here?
[White "White (to move)"]
[Black "Black"]
[FEN "rnq1kb1r/ppp3pp/4pn2/4N3/2QP4/2N2P2/PPP3PP/R1B1K2R w KQ - 0 13"]
In this position, White can still castle, but Black cannot (having moved the king ...
2
votes
1answer
115 views
How to get stockfish to play a selfmatch without clearing the hash table between games
A while ago I asked a question about how to let Stockfish play 10 games with itself for a limited number of moves:
Python script to let stockfish selfplay 10 games from a given position
This ...
3
votes
1answer
234 views
Python script to let stockfish selfplay 10 games from a given position
I would like to have Stockfish to selfplay 10 games starting from a given position. Game should end after 10 moves. From the python-chess documentation there is an example of playing only one such ...
8
votes
3answers
2k views
Stockfish: What is the maximum (minimum) centipawn score that a position might be evaluated at?
With the exception of checkmate and mate-in-x positions, what is the highest centipawn score that a chess position might obtain upon Stockfish evaluation?
This is a practical question because there ...
3
votes
1answer
150 views
Compile StockFish optimized for arm64-v8a
I cloned StockFish from GitHub and did a make inside the src folder and found that supported archs are:
x86-64-bmi2 > x86 64-bit with pext support (also enables SSE4)
x86-64-modern ...
5
votes
2answers
714 views
Stockfish 10 working on only 1 core at a time
I am a lichess user who would like to be able to use my 8C/16T processor to the best of my ability, and yet when I start up a chess engine only one of my cores is working on stockfish the rest are ...
2
votes
2answers
102 views
Early line in english opening not in the chessbase powerbook 2019 but seen by stockfish 10 64bits under latest fritz
I am looking at 1.c4 Nf6 2.g3 d5 3.Bg2 dxc4 4.Nf3 and Chessbase's Powerbook 2019 only proposes 4...c6, 4...g6, 4...a6, 4...Nbd7, 4...Qd6 or 4...Be6 whereas Fritz 17 64bits latest update using ...
-2
votes
1answer
117 views
How to force Stockfish to make mistake [closed]
I developed a bot. It had a 100% win rate and my account was banned. I need to get it to make mistakes but can't force Stockfish to do it. How can I modify Stockfish to make mistakes?
20
votes
3answers
4k views
Why is Leela so good at beating Stockfish in the French/Slav?
I notice Lc0 is especially good against Stockfish in French / Slav pawn structures. However, I don't understand why.
Here're a couple of games where Leela smoothly outplays Stockfish. Can anyone ...
2
votes
2answers
3k views
Why doesn't Stockfish (DroidFish) try to flag me?
Imagine the following position:
[FEN "3k4/7p/7K/3B4/8/8/8/8 w - - 0 1"]
White is played by Stockfish in DroidFish and black by human (me). We both have 15 seconds.
After a few moves, white bishop ...
8
votes
2answers
320 views
Weakening g4 move
I would like to know the reason behind the very weakening move g4 recommended by Stockfish in this position:
5
votes
2answers
274 views
Is it possible to combine CPU and GPU engines to use the other's principal variation?
This is a speculative question since I don't know if such an engine is even plausible.
The idea: we'll start Stockfish and Leela at the same time using both my CPU and GPU. Within a fraction of a ...
