Questions tagged [fen]
Forsyth-Edwards Notation (FEN) is a standard notation for recording a particular chess position, including the location of pieces, which side is to move, what castling rights are available, etc.
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Chess FEN/EPD/PGN mirroring?
I am looking for a tool which is able to automatically convert a chess FEN/EPD/PGN file with 100+ positions into
a) a file with the same positions but different side to move, or
b) a file with the ...
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Converting image to FEN programmatically
I'm wanting to create a little screenshot tool that takes a screenshot and outputs an FEN to the clipboard. I was hoping to use chessvision.ai, but it does not seem to have an API that allows me to ...
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Changing the FEN position color
How would I write a function that would change the color to play of the given position and be consistent with?
Example FEN:
input:rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR w KQkq - 0 1
output:...
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Is there open source sophisticated FEN validator?
I was looking for a sophisticated open source validator on github, but what I find so far are rudimentary regex based validators.
By "sophisticated", I mean ability to perform validation ...
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How do I get a text response from 4kit Nalimov endgame tablebase
I am trying to get a simple text response from 4kit Nalimov endgame tablebase, using an URL and asking for the answer to a FEN string.
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Weird Stockfish UCI output for d2d4 before and after
I am currently trying to code a training tool and am a bit confused by what Stockfish returns.
Before doing d2d4 it states that this move will have a 56 centipawn advantage for White - which is what I ...
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Programming FEN diagrams
I'm thinking about creating ANKI flashcards deck with my games positions as a training tool. Is there a way to programmatically (can be whatever programming language, I'll figure it out) generate ...
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How do you input FEN into Lucas Chess?
How can I input a position into Lucas Chess, in order to view the underlying engine's analysis through Lucas Chess's GUI? The position would be specified in FEN.
Under its menu Tools->PGN, Lucas ...
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Quick method for generating FEN strings from PGN using Python Chess
Is there a fast way to generate FEN strings for every move in a PGN?
I'm generating an opening book using the Lichess elite database and Python Chess, but Python Chess is taking a surprisingly long ...
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Can all UCI engines output a FEN for the current position or is it just StockFish?
I know in StockFish if you type "d" you get an ascii view of the board and a FEN string for the current state. Is there any command in other UCI engines such as Rybka 4 that will output a ...
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Copy/paste games from Chess StackExchange to lichess.org [closed]
When I encounter an interesting question on Chess StackExchange, I would like to import that game to http://lichess.org, to be able to analyze it with Stockfish. When I use the "Copy game" ...
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Software for reading multiple FEN positions
I have started playing around with SCID and Arena to analyze my games and store interesting screenshots. I recently heard about the FEN notation which makes it convenient to describe chess positions (...
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Is it preferable to pass a FEN notation or list of moves to a chess engine?
I am actually programming a chess UI and I'd like to communicate with a chess engine using UCI protocol. After reading the protocol specifications, I am not sure how to use the position command. For ...
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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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Longest possible FEN
What is the longest possible FEN? The reason for that question is, that I am designing a PGN viewer (again), and I have noticed that the FEN is dependent on the width of the board (the FEN test area ...
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How can I convert screenshot capture into FEN to analyse on Windows 10+? [duplicate]
I want to analyze position presented on meeting, web page or video but problem is that I have not FEN to start such analysis. It need manual work to do it.
I want to capture screenshot than convert it ...
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What do the numbers mean at the end of predicted variation opcode in and EPD entry?
I'm writing an EPD (Extended Position Description) parser and I have a doubt about what numbers means at end of "predicted variation" opcode.
Look the follow EPD sample:
rq2r1k1/5pp1/p7/4bNP1/1p2P2P/...
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A script that can create a chess tree from an EPD file
Is there any script (any language) that can make a chess tree from an EPD file? Or what algorithm (any example) should be use to create it on my own?
I am looking for one like the Chessbase opening ...
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How to detect invalid pawn structures (not based on opponent material) for FEN valdation?
I'm going to further expand a FEN validation function I have been working on for some time to include illegal pawn formations such that:
... for example white pawns could
never be on a2, a3, and ...
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Chess FEN winner
I'm new to Chess FEN notation and I'm making an online chess game, but I have one problem, I need to check after every new move if there is a winner and which one is a winner.
Can I extract that ...
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What's the point of the full move counter in FEN?
For what do you need to know the number of full moves? You still can't recreate every move in the game with FEN anyways, so I don't see the point of the full move counter. Is there any rule that ...
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Why is en passant possibility recorded in FEN regardless of whether there is a pawn ready to make the capture?
If a pawn has just moved two squares ahead, one records the square right behind it in the part of FEN for recording en passant possibility, regardless of whether there is a pawn of the opposite color ...
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Chess Problem Database with PGN or FEN
Is there a database of chess problems that have the game or positions PGN and or FEN?
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How the engine can detect the 3-fold repetition using FEN input? [duplicate]
When I run the engine (UCI interface), I usually feed the last position from the game using position fen ... command and get the best move back. The FEN encodes the possibility of the castlings, en ...
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How does X-FEN (Chess960 FEN) differentiate from traditional FEN notation?
I understand that a modified version of FEN notation is needed to properly record a Chess960 game.
I know that en passant is only slightly different, (an en passant possibility is only recorded if ...
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Can one import FENs of positions involving checkmate into Droidfish?
I recently copied the following curious position (from this answer) to clipboard, and tried pasting it in Droidfish.
3b1q1q/1N2PRQ1/rR3KBr/B4PP1/2Pk1r1b/1P2P1N1/2P2P2/8 w - - 0 1
However, the ...
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FEN inverter website/page?
This board shows the black pieces on the bottom, but the white pieces are supposed to be there; I accidentally set up the board so that white's pieces are on the black side. I am looking to flip the ...
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FEN notation problem
See image: Why does this FEN code display incorrectly (it should describe the Portsmouth gambit)?
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Stockfish evaluation of a position from PGN
I am trying to get Stockfish's evaluation of a board position(which is in PGN format) using command line.I know it accepts board position in FEN format, but is there any way i can provide PGN format?
...
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pgn-extract suppress output
I installed pgn-extract_17.38 and want to suppress the output of
$ FEN=$(echo "1.d4 Nf6 2.Nf3 e6 3. *" | pgn-extract -F)
Processing stdin
1 game matched out of 1.
I read about suppressing methods ...
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Engine output: FEN string when blundering
What is the best way to go through a database of my games and have the computer generate a FEN string as well as the next move any time I make an error greater than, say, a minor piece loss?
I've ...
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How to determine checkmated positions using DOS/CMD, from numerous FEN/EPD chess positions?
I have a collection of checkmated chess positions, in FEN/EPD format.
Most of the time, each of these positions contains some useless pieces, that I really want to remove, in the aim of getting ...
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Is there a master list of FEN chess positions for advanced beginner/intermediate?
I'm an advanced beginner. I don't have internet access as much as I like to, so I'd much rather have a series of chess position FENs that I can put into some free chess engine and then try to play ...
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High-quality (not bitmap) diagram software
I'm looking for software that can take FEN and generate a high-quality diagram, in PDF, Postscript, Windows metafile, or something else that will look good at 1200x1200 dpi or better. I thought the ...
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How can I scan a chessboard and obtain its FEN?
I am planning to create a chess puzzle book for beginners. Diagrams need to be published in the book. Right now I have all the materials in PDF. But I need a software to create diagrams for a ...
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Online program for FEN recalculation
I am looking for any online tools that can recalculate the the FEN values based on the current FEN and a given step. Are there any such tools or should I write one on my own.
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Chess Engine API
I am writing a C# 3D chess game in Unity. I am looking for a chess engine that can
Take in an FEN string
Return the best move to make given this FEN
Check if the board given this FEN is in checkmate
...
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Endgame FEN generator
is it possible to generate FEN strings for endgames based on specific criteria: n-pieces, w/d/l, and side to move?
So say I wanted all FEN strings for King plus Rook vs King plus Pawn (KPKR) ...
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How do I create pgn files visually?
I'm looking for a way to create PGN files visually - so I don't want to type in the position and the moves manually, but I want to set up an initial position on a board, play some moves and then ...
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Do better board representations than the standard one exist?
Consider the classical representation of the state of a chess game. I'll draw the board:
R BK BNR
PPPP PP
N Q
PP
p
np p
ppp pp
r bkqbnr
Here is its move list:
d5 d5
c4 c6
Nf3 e6
...
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Alternatives to the FEN notation
Apart from the FEN notation, are there other even more compact known chess-position notations? One that would of course also entail castling rights, and en passant possibilities.
One really missing ...
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Software to create FEN notation?
I am new to FEN notation. I understand its importance for describing position of pieces on board. I also understand FEN notations after reading about it in Wikipedia. However, it is a time taking ...
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Numerical FEN writing
What is the most compressed way to "write" a chessboard as an integer considering en passant and castling as always possible no matter what.
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Fen - Check if King is on e1/e8
Is there some easy way to check whether the black king is on e8 or the white king is on e1, when using fen?
Here the black and white king are on d1/8 r2k3r/3q4/8/8/8/8/8/R1QK2RR
Here both are on the ...
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Question on FEN and castling
I was reading about FEN notation, and noticed the following line in the relevant Wikipedia article:
If neither side can castle, this is "-". Otherwise, this has one or more letters: "K" (White can ...
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Differences between FEN and EPD?
I just read the description of FEN (Forsyth–Edwards Notation) and EPD (Extended Position Description), I have a basic idea of what they are, but I still have some points that are not entirely clear:
...
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Why isn't the active color allowed to be in check in a FEN legal position?
The title says it. Reading up on how to describe the position of a board, all of the requirements make sense (like two kings not being on adjacent squares and so on) except for the active color being ...
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How do you know when a FEN position is legal?
I am making a research on validating FEN positions, at first it is obvious the basics things to look for, such as checking if there are only two kings and making sure the rows or columns add up and ...
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Open source chess playing or pgn viewing libraries
Is anyone familiar with any open source chess libraries in any language that can do any of the following:
parse PGNs and/or FENs
calculate valid chess moves based on position
process an entire chess ...
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