Free Chess Solver & Move Calculator
Find the best chess move in any position with Stockfish-powered analysis
How the Chess Solver Works
Our chess solver uses Stockfish 18, the world's strongest open-source chess engine, to analyze any position and find the best move. Stockfish evaluates millions of positions per second, looking 20+ moves ahead to find the objectively strongest continuation.
Whether you're stuck in a game, reviewing a position from a book, or analyzing a tournament game, the chess solver gives you grandmaster-level analysis instantly — completely free in your browser.
Set Up Position
Drag pieces on the board, paste FEN, or load a PGN game
Instant Analysis
Stockfish calculates the best move with evaluation scores
AI Insights
Get AI explanations of why each move is the best choice
Ways to Use the Chess Solver
Find the Best Move
Set up any position and click "Hint" to see the best chess move. The solver shows the top move with an evaluation score so you know exactly how strong it is.
Analyze Full Games (PGN)
Paste your game's PGN to review every move. The solver evaluates each position and identifies mistakes, blunders, and brilliant moves. Try the full game analyzer.
Solve from Screenshot
Upload a screenshot from Chess.com, Lichess, or any chess board image. Our scanner detects the position and runs the solver automatically. Learn how image solving works.
Load FEN Position
Paste any FEN string to instantly load a position. Copy FEN from Chess.com, Lichess, or any chess site and analyze it with our Stockfish-powered solver.
Why Use Our Chess Calculator?
Stockfish 18 Engine
Powered by the world's strongest open-source chess engine, rated over 3500 ELO. The same engine used by professional grandmasters for analysis.
Free & Instant
No download, no account needed. Open the solver in your browser and get analysis in seconds. Works on desktop, tablet, and mobile.
AI Move Explanations
Don't just see the best move — understand why it's best. Our AI coach explains the reasoning behind each recommendation.
Multiple Input Methods
Set up positions by dragging pieces, pasting FEN strings, loading PGN games, or uploading screenshots. Use whichever method is fastest for you.
Our Chess Tools
Chess Solver Online
Use our chess solver online free — no download needed. Analyze any position with Stockfish and find the best move instantly in your browser.
Best Chess Move Calculator
Our best chess move calculator evaluates millions of positions per second. Get the same analysis power used by grandmasters, completely free.
Chess Move Analyzer
Analyze chess moves with AI-powered insights. See evaluation scores, alternative lines, and understand why certain moves are stronger than others.
Chess AI Helper
Our chess AI helper finds the best move in any position. Use it to study games, prepare openings, or learn from your mistakes with detailed analysis.
Chess Position Solver
Solve any chess position instantly. Whether it's a puzzle from a book, a critical game moment, or a complex endgame — our solver finds the answer.
Stockfish Chess Solver
Powered by Stockfish 18, the world's strongest chess engine. Same solver used by world champions for game preparation and analysis.
Frequently Asked Questions
What is a chess solver?
A chess solver is a tool that analyzes any chess position and calculates the objectively best move to play. Our solver uses Stockfish 18, the world's strongest open-source chess engine rated over 3500 ELO on the CCRL rating list, to evaluate positions instantly. Unlike human analysis which can be subjective, a chess solver uses mathematical algorithms to search through millions of possible move sequences per second, identifying the strongest continuation in any position. Chess solvers are used by players of all levels — beginners use them to learn which moves are best, intermediate players use them to analyze their games and find mistakes, and advanced players use them for opening preparation and endgame study. Our solver runs directly in your browser via WebAssembly, requiring no downloads, installations, or account creation to get started.
How does the chess move calculator work?
The chess move calculator runs Stockfish 18 directly in your browser using WebAssembly technology. Set up your position on the interactive board by dragging pieces, paste a FEN string copied from any chess website, or load a complete PGN game file. Once the position is ready, click the Hint button to start analysis. Stockfish uses alpha-beta search with iterative deepening to explore millions of positions per second, combined with NNUE neural network evaluation for accurate position assessment. The calculator returns the best move highlighted on the board along with a centipawn evaluation score that tells you exactly how much advantage each side has. You can also enable AI insights for natural-language explanations of why each move is strongest, or use the ELO depth slider to adjust analysis strength from 600 to 3650 ELO depending on your subscription tier.
Is this chess solver free?
Yes, our chess solver is completely free to use with generous daily limits. The free tier includes position analysis powered by Stockfish 18 up to 800 ELO depth, 5 AI-powered move insights per day, access to all 11 AI bots for practice games, community puzzles, and the full learning center. The free calculator uses the same Stockfish engine that powers professional analysis, so you get high-quality move suggestions at no cost. For serious players who want the deepest analysis available, the Pro subscription at $9.99 per month or $99.99 per year unlocks the full ELO range up to 3650, unlimited daily AI insights, a Chrome extension for analyzing positions from online chess websites, Human-Style Play, screenshot scanning, full PGN game analysis, custom puzzle creation, and priority support.
Can I solve a chess position from a screenshot?
Yes, Pro members can upload screenshots from Chess.com, Lichess, Chess24, or any chess board image and our computer vision scanner will automatically detect all pieces and their positions on the board. The scanner works with screenshots from desktop browsers, mobile apps, photos of physical chess boards, and images from chess books or broadcasts. Once the position is detected, it loads instantly onto the interactive board where you can run Stockfish analysis with a single click. This feature saves significant time compared to manually setting up each piece, especially for complex middlegame positions with many pieces. The scanner handles different board themes, piece styles, board orientations, and various image qualities. It is one of the most popular Pro features because it bridges the gap between seeing a position anywhere and analyzing it immediately.
How accurate is the chess solver?
Our solver uses Stockfish 18, the strongest chess engine available with an estimated rating over 3500 ELO on the CCRL rating list — over 600 points stronger than Magnus Carlsen's peak rating of 2882. At full analysis depth on the Pro tier, the solver finds the objectively best move in virtually every position, considering tactical combinations dozens of moves deep and evaluating positional nuances that even grandmasters miss. The accuracy scales with the ELO depth setting: at 800 ELO (free tier), the solver provides strong suggestions suitable for beginner to intermediate play, while at 3650 ELO (Pro tier), it delivers the absolute strongest moves possible. The NNUE neural network evaluation in Stockfish 18 is particularly strong at assessing complex positional situations where traditional engines previously struggled, making modern Stockfish more accurate than any previous version.
What is the best chess move in the starting position?
According to extensive Stockfish analysis and decades of grandmaster practice, 1.e4 and 1.d4 are the two strongest opening moves in chess. Stockfish evaluates 1.e4 with a slight edge of approximately +0.30 centipawns, while 1.d4 scores around +0.25. Both moves follow the fundamental opening principles of controlling the center and enabling rapid piece development. After 1.e4, White immediately controls the d5 and f5 squares and opens lines for both the queen and king's bishop. After 1.d4, White controls e5 and c5 while keeping more central tension. Other respectable first moves include 1.Nf3, 1.c4 (English Opening), and 1.g3, each leading to different strategic landscapes. The choice between openings ultimately depends on your playing style — 1.e4 tends toward tactical, open games while 1.d4 often leads to more strategic, positional play.
Can I use the chess solver to analyze full games?
Yes, paste your complete game in PGN (Portable Game Notation) format into our chess analysis tool to review every single move with Stockfish evaluation. The solver processes the entire game and provides a centipawn evaluation at each position, making it easy to identify exactly where the game turned. Critical moments are flagged as mistakes, blunders, inaccuracies, or brilliant moves based on the difference between the move played and the best move available. You can step through the game move by move using navigation arrows while watching the evaluation bar shift to visualize momentum changes. The AI insights feature adds natural-language commentary explaining key positions in terms you can understand, going beyond raw numbers to teach you the reasoning behind strong moves. This analysis method is one of the most effective ways to improve at chess.
What is FEN notation?
FEN (Forsyth-Edwards Notation) is the universal standard for describing a complete chess position as a single text string. A FEN string contains six fields separated by spaces: piece placement on all 64 squares, the active color to move, castling availability for both sides, en passant target square, halfmove clock for the fifty-move rule, and the fullmove number. For example, the starting position FEN is: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1. You can copy FEN from virtually any chess website including Chess.com, Lichess, and Chess24, then paste it directly into our solver to analyze that exact position instantly. FEN notation is particularly useful for sharing specific positions with other players, saving interesting positions for later analysis, or setting up positions from chess books and puzzles without manually placing each piece on the board.
Ready to find the best move?
Want deeper analysis? Try Pro — 3650 ELO depth, unlimited AI insights & Chrome Extension