Is chess.koz.tv free to use?

Yes, chess.koz.tv is completely free. You can analyze unlimited games from Chess.com, Lichess, or upload PGN files without any subscription or payment.

What chess platforms are supported?

chess.koz.tv supports Chess.com, Lichess, and custom PGN file uploads. You can import games from any of these sources for analysis.

How does the chess analysis work?

We use Stockfish 17, the strongest open-source chess engine. Analysis runs on our servers at depth 15+, with many positions pre-analyzed at depth 20+ from the Lichess database. We provide centipawn evaluations, move classifications, accuracy ratings, and opening detection.

Can I analyze multiple games at once?

Yes, you can import and analyze multiple games at once. We also offer batch analysis features to identify patterns across your recent games.

How do I get the FEN of a position?

Most chess websites and software have a "Copy FEN" or "Share Position" option. On Chess.com, click the share button and select "FEN". On Lichess, use the board editor or analysis board to copy FEN. Chess software like ChessBase also exports FEN.

Can I analyze a FEN position for free?

Yes! chess.koz.tv offers free FEN position analysis using Stockfish 17. Paste your FEN string into a PGN with the FEN header, and we will analyze the position with our server-side engine.

What does the FEN analysis show?

FEN analysis shows the position evaluation in centipawns or mate-in-X, the best moves for the side to play, and alternative continuations. You can see the engine's top recommendations and understand who stands better.

FEN Position Analyzer - Free Stockfish Chess Analysis

What is FEN Notation?

FEN (Forsyth-Edwards Notation) is the standard way to describe any chess position in a single line of text. Created by Scottish journalist David Forsyth and later extended by Steven Edwards, FEN has become the universal language for sharing chess positions.

A FEN string contains six parts: piece placement, active color, castling rights, en passant target, halfmove clock, and fullmove number. For example, the starting position is:

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1

Lowercase letters represent black pieces (r=rook, n=knight, b=bishop, q=queen, k=king, p=pawn), and uppercase represent white pieces. Numbers indicate empty squares.

How to Analyze a FEN Position

Get Your FEN

Copy the FEN string from your chess software, website, or puzzle book. Most platforms have a "Copy FEN" option.

Create a PGN

Wrap your FEN in a PGN format with [FEN "your-fen-here"] header. You can add moves from that position too.

Get Analysis

Our Stockfish 17 engine analyzes the position, showing evaluation, best moves, and alternative lines.

FEN Format Explained

A FEN string has six fields separated by spaces:

Piece Placement

Ranks 8 to 1 (top to bottom), separated by slashes. Pieces: K=King, Q=Queen, R=Rook, B=Bishop, N=Knight, P=Pawn. Lowercase = black.

Active Color

"w" for White to move, "b" for Black to move.

Castling Rights

"K" = White kingside, "Q" = White queenside, "k" = Black kingside, "q" = Black queenside. "-" if no castling available.

En Passant Square

The square where en passant capture is possible (e.g., "e3"), or "-" if none.

Halfmove Clock

Moves since last pawn move or capture (for 50-move rule).

Fullmove Number

The current move number, starting at 1 and incrementing after Black's move.

Why Analyze FEN Positions?

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Study Puzzles

Found a puzzle in a book? Get the FEN and analyze variations you weren't sure about.

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Analyze Specific Positions

Skip to a critical position from your game and explore what the engine recommends.

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Create Training Material

Set up positions for students or yourself and verify the solutions with engine analysis.

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Verify Evaluations

Double-check evaluations from books or videos against current Stockfish analysis.

Frequently Asked Questions

What is FEN in chess?▼

FEN (Forsyth-Edwards Notation) is a text format that completely describes a chess position. It includes piece placement, whose turn it is, castling rights, en passant availability, and move counts — all in one line.

How do I copy FEN from Chess.com or Lichess?▼

On Chess.com: Open the game or analysis board, click the share icon, and select "FEN". On Lichess: Open the analysis board, click the hamburger menu, and choose "FEN & PGN" to copy.

Is FEN analysis free?▼

Yes! chess.koz.tv provides free position analysis. Create a PGN with your FEN string in the header and upload it for Stockfish analysis — no signup required.

Can I analyze just a position without a full game?▼

Yes! Use the FEN header in your PGN. For example: [FEN "rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq e3 0 1"] followed by moves from that position. We'll analyze starting from your specified position.

Example: PGN with FEN

Here's how to create a PGN that starts from a specific FEN position:

[Event "Position Analysis"]
[Site "chess.koz.tv"]
[White "Analysis"]
[Black "Position"]
[FEN "r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4"]

4. Ng5 d5 5. exd5 Na5 *

This starts from the Italian Game and analyzes the Fried Liver Attack. You can add as many or as few moves as you want after the FEN.

Analyze Your Chess Position

Get professional Stockfish analysis for any FEN position — free, no signup required

Start Position Analysis