Is this a tactics puzzle trainer like Lichess?

No. There is no public puzzle database. Every position comes from a game you load — typically one you played over the board and scanned from a scoresheet.

Which mistakes become puzzles?

Mistakes and blunders whose engine move is a capture, a check, a mate or a promotion. Quiet inaccuracies and opening book moves are left out, and two shots a ply or two apart on the same side keep only the larger one.

Do I need an account?

No. The engine runs in your browser and saved tactics stay in this browser's storage. Sign in only if you want scanned games in your library.

How do I get a PGN from a paper scoresheet?

Photograph the scoresheet and run it through ScanChess. After the moves are checked, review the game here and the missed shots become the set.

Why was a blunder I remember not turned into a puzzle?

If the better move was a quiet improvement — a retreat, a prophylactic king move — it is not a tactic. The review still marks it on the move list; this trainer is only for shots.

Missed Tactics from Your Own Games

Free tool · No account needed

Turn the shots you missed over the board into puzzles you can solve again tomorrow. Runs in your browser. Nothing is uploaded.

Is the game on a paper scoresheet? Scan it into PGN instead of typing it.

Scan an image Try the free example

A public tactics trainer drills someone else's combinations. This one drills yours. Load a PGN — paste one, or scan a scoresheet first — run the same Stockfish review the analysis tool uses, and ScanChess keeps only the misses that were actually tactics: a capture, a check, a mate or a promotion the engine wanted and you did not play. Quiet positional slips stay out. Save a set in this browser to come back to tomorrow.

What this tool does

From your scoresheet, not a bank

The positions are the ones you played. Scan the paper, review the game, and the forcing shots you missed become the set. Lichess cannot do this, because it never saw the sheet.

Only forcing shots

A 20-point squeeze that wanted a quiet king move is not a puzzle. The extractor keeps captures, checks, mates and promotions, and drops near-duplicate collapses so a lost game does not dump the same wreck twice.

Solve it on the board

Play the first move of the solution; the opponent's reply from the engine line appears on its own. Two wrong tries unlock the answer, and the move you played in the game is shown only after.

Saved on this device

Keep a set to practice later. Nothing is uploaded; the list lives in this browser until you clear it.

How to train missed tactics

1
Paste a PGN, or scan a scoresheet first and export the game here.
2
Turn on the engine and review the whole game. Stockfish walks every position in this tab.
3
When the review finishes, practice the forcing shots it found — or save them and come back tomorrow.
4
On each position, find the move that was missed. The line continues until the shot is complete.

Frequently asked questions

Is this a tactics puzzle trainer like Lichess?: No. There is no public puzzle database. Every position comes from a game you load — typically one you played over the board and scanned from a scoresheet.
Which mistakes become puzzles?: Mistakes and blunders whose engine move is a capture, a check, a mate or a promotion. Quiet inaccuracies and opening book moves are left out, and two shots a ply or two apart on the same side keep only the larger one.
Do I need an account?: No. The engine runs in your browser and saved tactics stay in this browser's storage. Sign in only if you want scanned games in your library.
How do I get a PGN from a paper scoresheet?: Photograph the scoresheet and run it through ScanChess. After the moves are checked, review the game here and the missed shots become the set.
Why was a blunder I remember not turned into a puzzle?: If the better move was a quiet improvement — a retreat, a prophylactic king move — it is not a tactic. The review still marks it on the move list; this trainer is only for shots.

The shots you missed are still on paper

Scan the scoresheet, review the game, and practice the tactics that actually cost you the point. New accounts start with free credits.

Scan a scoresheet

Guides for this tool

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