Your Free Online Chess Coach
ChessMentor AI analyses every move in your chess games with Stockfish, detects your error patterns, and coaches you in depth — play chess online and improve for free with the precision of a professional coach.
No account needed · go to my games →
35K+
games analysed
18
patterns detected
100%
in-browser
87%
Accuracy
63%
Win rate
1.2
Blunders/game
Detected patterns
Get started now
Import your games
Enter your Lichess or Chess.com username to get started
Everything you need to improve
Free Online Stockfish Analysis
World's #1 chess engine, version 17.1 WASM. Analyze your chess games online for free — up to 4 games in parallel, right in your browser.
Personalised Coaching Report
Move-by-move accuracy, win rate, blunders per game, chess opening statistics, 12-month trends. A complete picture of your chess game.
Chat with the AI coach
The coach knows your games, your strengths and your weaknesses. Ask anything about your progress.
Report history
Every report is saved. Compare your accuracy and win rate from one month to the next.
Multi-Platform Import
Import chess games from Lichess and Chess.com into the same profile. Analyze thousands of games online for free.
Local analysis
Stockfish runs in your browser. Your games never leave your machine for the analysis step.
How to Play Chess Online and Improve
Create a profile and add your accounts
Connect your Lichess, Chess.com account, or both. The system automatically imports your online chess games.
Run the free Stockfish analysis
Choose the number of cores and analysis depth. All your chess games are processed for free in the background.
Read your report and chat with the coach
A full report on your chess games is generated and saved. Then ask the AI coach anything, in full context, to improve fast.
Testimonials
Players who levelled up
"The AI coach pinpointed exactly why I was losing in the endgame. Within 3 weeks my win rate jumped 14 points."
Lucas M.
Lichess · 1650 → 1820
"I'd tried every puzzle app. ChessMentor is different — it analyses YOUR games and tells you YOUR mistakes. Game changer."
Sophie R.
Chess.com · 1420 → 1580
"The Stockfish WASM is insanely fast. I analysed 500 games overnight and had a full report by morning."
Matteo F.
Lichess · 1280 → 1410
Thousands of chess games analyzed for free online
Import your chess games from Lichess and Chess.com, then run free Stockfish 17.1 WASM analysis directly in your browser. No server, no limits.
35 447
games
12 847
Lichess
22 600
Chess.com
14 203
analysed
A precise, complete diagnosis of your chess game
Move-by-move accuracy, error distribution by phase, performance by opening and time control — everything in one report.
84%
Avg. accuracy
62%
Win rate
1.2
Blunders / game
2.8
Mistakes / game
Errors by game phase
Opening statistics
Every mistake in your chess games categorised and explained
The system detects 18 types of tactical and positional patterns in your games and generates personalised coaching narratives.
Missed Forks
TacticalYou miss 8 tactical forks across 124 analysed games (6% of your errors). Move 18: Nd5 simultaneously attacked the queen on e7 and rook on b8 — a decisive material gain you missed. A knight fork is often the most profitable tactic in the middlegame. Before playing, always ask: does a central square threaten two enemy pieces at once?
Development Neglected
PositionalYou delay piece development in 12 games (9% of your errors). Move 7: Qd3 played while the bishop on c1 and knight on b1 were still on their starting squares. The golden opening rule: develop a new piece every move. Every tempo lost is a free move gifted to your opponent to build their attack.
King Shelter Weakened
PositionalYou push a pawn in front of your king in 7 games (5% of your errors). Move 22: g4 advances the king-side pawn while queens are still on the board. The pawns in front of the castled king form an irreplaceable shield — once advanced, they can't retreat and king safety collapses.
fork missed
piece hanging
no development
bad bishop
pawn break
king exposed
Chess puzzles generated from your real games
The system automatically extracts your key positions and creates ultra-personalised puzzles. Every exercise comes from a mistake you actually made — no generic training.
Nd5 simultaneously attacked the queen on e7 and rook on b8. A central knight fork — the type of decisive move you should never miss.
Nd5 simultaneously attacked the queen on e7 and rook on b8. A central knight fork — the type of decisive move you should never miss.
Nc3 develops a new piece and controls the centre. With the bishop on c8 and knight on b8 still on starting squares, every move must develop.
Ready to discover your mistakes? Import your games now.
Ask questions about your chess games
The coach knows your games, error patterns and opening statistics. Every answer is grounded in your real game history.
Track your progress over time
Every report is saved automatically. Visualise your accuracy and win rate trend report after report.
6-month trend
June 2025
84%
Accuracy
62%
Win rate
58 games
May 2025
83%
Accuracy
64%
Win rate
44 games
April 2025
81%
Accuracy
61%
Win rate
61 games
March 2025
82%
Accuracy
63%
Win rate
47 games
February 2025
80%
Accuracy
60%
Win rate
52 games
January 2025
78%
Accuracy
58%
Win rate
38 games
Choose your plan
AI coaching, interactive courses, or both — at the best price.
AI Coach
Personal coaching powered by your games
- Import from Lichess & Chess.com
- Stockfish 17.1 analysis
- Full AI coaching report
- Weakness insight narratives
- AI coach chat
- ✕Interactive courses
Courses
1 interactive course per month
- 1 interactive course per month
- PGN-based interactive exercises
- Progress tracking per chapter
- Courses from GM-level authors
- ✕AI coaching report
All Access
Everything — courses + AI coach
- All interactive courses (unlimited)
- Full AI coaching report
- Weakness insight narratives
- AI coach chat
- Priority access to new features
Frequently asked questions
How do I import my games?
Is the analysis really free?
How is this different from Chess.com or Lichess?
Is my data secure?
Analyze your chess games online for free
Enter your Chess.com or Lichess username to analyze your chess games for free with Stockfish 17.1.
Everything about online chess
ChessMentor AI is your free online chess coach. Whether you want to play chess better, analyze your chess games, or master chess openings, our tool guides you every step of the way.
Import your online chess games from Chess.com and Lichess, and let Stockfish 17.1 analyze every move on the chess board. The AI coach detects your recurring mistakes — whether it's hanging chess pieces, missed forks, or opening errors.
Unlike a regular chess game or chess set, ChessMentor AI teaches you how to improve. It's the best way to get better at chess — for free, with no limits.