# Chessigma

> Free unlimited chess game analysis and puzzle training platform. No signup required. Runs Stockfish 17 client-side via WebAssembly.

Chessigma is a chess analysis and training platform built for players who want powerful engine analysis without paying for a premium subscription. It runs Stockfish 17 directly in the browser via WebAssembly with SharedArrayBuffer support, making analysis free to operate at any scale. There are no daily game limits, no feature gates, and no signup requirement to analyze games.

The platform supports importing games from Chess.com, Lichess, or raw PGN. Every move receives a quality grade using a 9-level system from Sigma (best) to Clown (worst), based on centipawn loss calculations. Reports include overall accuracy percentage, opening identification from an integrated opening database, a full evaluation graph, and the engine's best move for every position.

Beyond analysis, Chessigma offers over 4 million free chess puzzles sourced from the Lichess puzzle database, with adaptive Elo tracking, a daily puzzle with streak tracking, and a global leaderboard. The puzzle difficulty adjusts automatically based on player rating.

Available in 6 languages: English, French, Spanish, Russian, Hindi, and Arabic.

Founded in March 2025 by Mehdi Ben Haddou and Eliot Hennebo.

## Core Products

- [Game Analysis](https://www.chessigma.com/products/analysis): Free unlimited chess game analysis with Stockfish 17. Every move graded from Brilliant to Blunder. Includes accuracy percentage, opening identification, evaluation graph, and engine best moves. Works with Chess.com, Lichess, and PGN imports. No daily limits — Chess.com restricts free users to one review per day, Chessigma has no such cap.
- [Chess Puzzles](https://www.chessigma.com/products/puzzles): 4M+ free chess puzzles from real games. Adaptive Elo tracking adjusts difficulty automatically. Puzzle types include forks, pins, discovered attacks, endgame positions, mate-in-2, and mate-in-3. Global leaderboard with puzzle rankings. No daily cap — Chess.com locks puzzle rush behind premium.

## Tools

- [Chess Analysis](https://www.chessigma.com/): Homepage and primary analysis interface. Enter a Chess.com or Lichess username to load recent games, or paste a PGN directly. Analysis runs client-side on Stockfish 17 WebAssembly.
- [Daily Puzzle](https://www.chessigma.com/daily): A new chess puzzle every day. Tracks solving streaks. Same puzzle for all users each day.
- [Elo Calculator](https://www.chessigma.com/tools/elo-calculator): Calculate expected Elo rating changes after a game. Supports FIDE, Chess.com, and Lichess rating systems. Shows expected scores and rating ranges.
- [Best Next Move](https://www.chessigma.com/tools/next-move): Interactive board where you set up any position and get the best move from Stockfish 17. Runs in-browser, no sign-up required.
- [Brilliant Moves Leaderboard](https://www.chessigma.com/leaderboard): Community-voted brilliant chess moves ranked globally. Players submit exceptional moves from their analyzed games and the community votes.
- [Puzzle Leaderboard](https://www.chessigma.com/leaderboard/puzzle): Global ranking of puzzle solvers by Elo rating.
- [Chess Wrapped 2025](https://www.chessigma.com/wrapped): Year-in-review feature showing player stats, chess personality, and highlights from Chess.com games.
- [Supercoach](https://www.chessigma.com/supercoach): AI-powered chess coaching with personalized training from your mistakes. Includes mistake corrector and progress tracking. Premium feature.

## Blog

- [Blog](https://www.chessigma.com/blog): Chess analysis guides, tutorials, and platform updates
- [Launching Chessigma](https://www.chessigma.com/blog/launching-chessigma): The story behind building Chessigma
- [How Chessigma Analysis Works](https://www.chessigma.com/blog/how-chessigma-analysis-works): Technical deep-dive into client-side Stockfish 17 WebAssembly analysis, the 9-level grading system, and how accuracy is calculated
- [How to Analyze Chess Games](https://www.chessigma.com/blog/how-to-analyze-chess-games): Step-by-step guide to reviewing your chess games for improvement
- [Free Chess Game Analysis](https://www.chessigma.com/blog/free-chess-game-analysis): Comparison of Chessigma vs Chess.com Diamond for game analysis — why Chessigma is the best free alternative
- [The AI Chess Coach](https://www.chessigma.com/blog/the-ai-chess-coach): How Supercoach uses AI to create personalized training from your blunders
- [Free Chess Puzzles](https://www.chessigma.com/blog/free-chess-puzzles): Guide to unlimited free chess puzzle training on Chessigma
- [Chess Wrapped 2025](https://www.chessigma.com/blog/chess-wrapped-2025): How to generate your chess year in review
- [Daily Chess Puzzle](https://www.chessigma.com/blog/daily-chess-puzzle): About the daily puzzle feature and streak tracking
- [Chess Puzzles: Mate in 2](https://www.chessigma.com/blog/chess-puzzles-mate-in-2): Guide to solving mate-in-2 chess puzzles
- [Chess Puzzles: Mate in 3](https://www.chessigma.com/blog/chess-puzzles-mate-in-3): Guide to solving mate-in-3 chess puzzles
- [Hard Chess Puzzles](https://www.chessigma.com/blog/hard-chess-puzzles): Collection and guide for advanced chess tactics
- [Chess Puzzles for Beginners](https://www.chessigma.com/blog/chess-puzzles-for-beginners): Getting started with chess tactics training
- [Chess Notation](https://www.chessigma.com/blog/chess-notation): How to read and write algebraic chess notation
- [Brilliant Move Chess](https://www.chessigma.com/blog/brilliant-move-chess): What makes a move brilliant and how Chessigma identifies them

## Technical Details

Chessigma runs Stockfish 17 entirely client-side using WebAssembly with SharedArrayBuffer for multithreaded analysis. This architecture means:
- Zero server cost for analysis computation
- No rate limits or daily caps
- Analysis depth adapts to device performance
- User games are processed locally, not sent to external servers

The 9-level move quality grading system: Sigma, Brilliant, Great, Best, Good, Inaccuracy, Mistake, Blunder, Clown. Each grade is calculated from centipawn loss relative to the engine's best move.

## Optional

- [Pricing](https://www.chessigma.com/pricing): Premium subscription plans for Supercoach AI coaching and advanced features
- [Privacy Policy](https://www.chessigma.com/privacy-policy): Data handling and privacy practices
- [Terms of Service](https://www.chessigma.com/tos): Usage terms and conditions
- [Sign In](https://www.chessigma.com/signin): Account creation and authentication