Bring your games
Connect Chess.com or Lichess. Blunderzone turns critical moments from eligible games into puzzles.
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by chess lovers, for chess lovers
Your games. Clearer lessons.
Understand your mistake. Practise the better move.
Turn critical moments from your Chess.com and Lichess games into training. Solve a game puzzle, request an AI explanation, and explore the better continuation.
Start free on the web Compare memberships
Free includes 1 AI explanation request per calendar month. Basic includes 40; Premium includes 200. Paid memberships are purchased in the iOS and Android apps.
From your game to your next lesson
Solve it. Understand it. Practise it.
Ask why
Solve a game puzzle, then choose Explain. Read the AI explanation in English and play through the original and better continuations.
Return to the position
Practise the better move and revisit your positions with spaced repetition.
On Free, automatic game import runs for the first 14 days after you create your Blunderzone account and can include older games. After that, keep training or upgrade to continue importing new games. If you have no eligible games during your import window, play a game on your connected account. How Free works.
Inside Explain
Why challenge the centre first?
In this real game position, Black played Be7. The better move was cxd4. Here is what Blunderzone explains.
Actual AI explanation · excerpt
What went wrong
Be7 is too passive: it postpones the central break and permits Nxf6+, allowing White to simplify Black’s active kingside pieces without first being challenged in the center.
Why the best move is better
cxd4 immediately challenges the center. Following the recapture, ...e5 drives the centralized knight away, giving Black useful activity and room to develop the c8-bishop.
The continuation illustrates best play and is not forced. In the app, you can play through both lines.
This is a static example from the app. Explain is requested after solving a game puzzle; it does not automatically annotate every move. An explanation may take time to prepare.
Keep learning with Basic
More games. More explanations.
Start with Free’s 1 AI explanation request per calendar month. Basic gives you 40 and keeps new games coming from one Chess.com and one Lichess account.
UK Basic: £3.99/month on iOS or £4.09/month on Android. Monthly subscriptions renew automatically until cancelled.
Compare Free, Basic and PremiumMake your next mistake useful
Start free in the browser. To upgrade later, open the mobile app and sign in to the same Blunderzone account. Go to Settings → Membership & billing to see your local price and subscribe.