Extension

chess.koz.tv

Analyze your chess games for free with Stockfish

⚡ Analyze games faster!

Install our Chrome extension to analyze your chess.com games with one click directly from the game page.

Install Extension

Get Started

Import your games from Chess.com, Lichess, or upload PGN files

Features

  • ✓Import games from Chess.com, Lichess, or PGN files
  • ✓Deep analysis powered by Stockfish engine
  • ✓Accuracy ratings and move classifications
  • ✓Identify blunders, mistakes, and brilliant moves
  • ✓100% free, no subscription needed

How to Analyze Your Chess Games

1

Import Your Games

Enter your Chess.com or Lichess username, or upload a PGN file

2

Stockfish Analysis

Our server analyzes every move using the powerful Stockfish 17 engine

3

Review & Improve

See accuracy scores, find blunders, and learn from your mistakes

Why Use chess.koz.tv for Game Analysis?

🆓

100% Free Forever

No hidden fees, no premium tiers for analysis. Unlimited game reviews at no cost.

⚡

Deep Server-Side Analysis

Stockfish runs on our servers — no browser slowdowns or battery drain.

📊

Detailed Move Classifications

Every move rated: brilliant, great, best, good, inaccuracy, mistake, miss, or blunder.

📈

Batch Analysis

Analyze multiple games at once to find patterns in your play and common mistakes.

🎯

Accuracy Ratings

Get precise accuracy percentages for both players using the Lichess formula.

📖

Opening Detection

Automatically identifies openings from our database of 3,000+ ECO variations.

Frequently Asked Questions

Is chess.koz.tv really free?▼
Yes! chess.koz.tv is completely free to use. You can analyze unlimited games from Chess.com, Lichess, or upload PGN files without any subscription or payment. We believe every chess player deserves access to quality game analysis.
What chess engine do you use?▼
We use Stockfish 17, the strongest open-source chess engine in the world. Analysis runs on our servers at depth 15+, with many positions pre-analyzed at depth 20+ from the Lichess database for instant results.
How is accuracy calculated?▼
We use the same accuracy formula as Lichess. Each move's centipawn loss is converted to win probability, then averaged across all moves. This gives you a percentage that reflects how close your moves were to the engine's top choices.
Can I analyze games from any chess platform?▼
You can directly import games from Chess.com and Lichess using your username. For other platforms, export your games as PGN files and upload them here. We support multi-game PGN files too!
How does batch analysis work?▼
Batch analysis lets you analyze multiple recent games at once and find patterns in your play. It identifies your most common mistakes, problematic openings, and areas for improvement across all analyzed games.
Is there a Chrome extension?▼
Yes! Install our Chrome extension to analyze games directly from Chess.com with one click. After finishing a game, you'll see an "Analyze on chess.koz.tv" button that imports and analyzes the game automatically.

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