Chess Non Stop
Chess Calculator & Game Analyzer
Instantly solve any position or run a deep post-mortem review of your games. Understand the evaluation, spot inaccuracies, and improve your strategy.
Position Setup
Game Control
Move history appears here.
Turn Your Blunders into Lessons
Pinpoint Critical Mistakes
Understand the exact moment the game turned. Our analyzer highlights every blunder and inaccuracy, showing you the evaluation drop so you can see the true cost of a bad move.
Discover Missed Opportunities
It's not just about what you did wrong, but what you could have done right. See the brilliant moves and hidden tactics you missed, complete with the engine's top suggested lines.
Learn Winning Patterns
By consistently reviewing your games, you'll start to recognize recurring tactical and strategic patterns. This is the fastest way to build your intuition and make better decisions over the board.
Prepare with Confidence
Use the board editor to set up positions from your opponent's games or practice specific endgames. Analyze the key lines so you're ready for anything in your next tournament.
Faster Than Lichess/Chess.com
Get Stockfish analysis instantly without ads, logins, or complex interfaces.
Get Your Instant Post-Mortem in 3 Steps
Load Your Game or Position
Paste your full game PGN into the text box, use a FEN string for a specific position, or open our full board editor to create any scenario you want to analyze.
Run the Instant Analysis
The moment your position is on the board, our integrated Stockfish engine begins its work. The evaluation bar will update in real-time and the top moves will be drawn with arrows.
Review the Insights & Learn
Navigate through your game using the move list. Our system automatically annotates blunders and mistakes. Click on any move to see the position and what the engine suggested instead.
How to Read Your Analysis
Understanding the engine's output is key to improving. Here’s what the numbers and symbols mean:
The Evaluation Score (+/-)
This number shows who has the advantage. A positive score (e.g., `+1.5`) means White is better by the equivalent of 1.5 pawns. A score of `0.00` is equal, and `+3.00` or more is typically a winning position.
Move Annotations (Blunder, Mistake)
We automatically flag moves based on centipawn loss. If the best move kept your score at `+0.5` but your move changed it to `-1.0`, that's a 150 centipawn loss—a clear blunder (`??`). A smaller drop is a mistake or inaccuracy.
Analysis Depth
This number in the analysis table indicates how many moves ahead the engine has calculated. A higher depth (e.g., 18+) means a more reliable evaluation, especially in complex positions.
Frequently Asked Questions
What engine does this analyzer use?
Our tool uses the world-class Stockfish chess engine, trusted by grandmasters and chess enthusiasts for its incredible accuracy and tactical strength.
How can I analyze my entire game?
The best way is to copy the PGN (Portable Game Notation) from the platform where you played (like Lichess, Chess.com, etc.) and paste it into the "Load PGN" text box on our tool.
Is my analysis private?
Yes, 100%. We do not save, store, or view your PGNs or analyzed positions. Your analysis is processed in your session and is completely private.
Can I share an interesting position with a friend?
Absolutely. Once you have the position on the board, click the "Share" button. This will copy a unique link to your clipboard that you can send to anyone.
How is this better than Lichess analysis?
Faster results, zero ads, no login required, and simpler interface - all with the same Stockfish engine.
Can I analyze positions from mobile?
Yes! Our tool works on all devices. Just paste PGN or use the touch-friendly board editor.