ChessMemory

All-in-one chess trainer — openings, tactics, game review & study. No account needed, works offline.

Play vs Computer

Play a full game or any position against the Lichess engine — choose the level, colour and time control. Games save to “My Games” with one-click Lichess analysis.

PLAY

Opening Trainer

FSRS spaced repetition with card journey preview. Drill inline with the live Lichess explorer. Import PGN repertoires and track pass rates by opening.

REPERTOIRE

Tactics Trainer

Drill puzzles with spaced repetition. Import from Lichess, PGN, CSV, or send mistakes directly from Games & Mistakes.

PUZZLES

Games & Mistakes

Fetch your Lichess games, browse blunders move by move, and send mistakes straight to the Tactics Trainer as personal puzzles.

MISTAKES

Game Analysis

Import PGN, Lichess games or studies. Annotate with NAG symbols, arrows and comments. Scan for patterns and organise into flashcard collections.

DATABASE

Endgame Study

Set up positions from a board editor, PGN, or your game database. Tag endgame types, explore lines, and review with flashcards.

ENDGAMES

Study Room

Read chess books (PDF, EPUB) or watch local videos side-by-side with a full analysis board. Switch freely between split, board-only, or reader-only view.

STUDY

Guess the Move

Replay any of your games move by move and guess what was played. Pick a side, track your score, and let Stockfish credit equally good moves.

TRAINING

Import |

Pricing· Terms· Privacy· Refunds· Licenses

Import Opening

Opening Name

Re-use the same name to update an existing opening and preserve your progress.

Play As

Build by playing moves on the board

Open the Repertoire Builder and play the moves you want to memorise directly on the board. Navigate with ← → keys or the buttons. Hit Save Repertoire when done.

PGN

Attach a .pgn file

Lichess Game URL

Imports a Lichess game as an opening repertoire entry. The moves become the lines to memorise.

Import chapters from a public Lichess study. Each selected chapter becomes its own opening.

Study URL

Multi-Game PGN File

Drop your PGN file here

or click to browse

Each game in the PGN file becomes a separate opening line in the collection. The opening name field is used as the collection name.

Settings

⬆ Import backup

Legal & account: Pricing· Terms· Privacy· Refunds

Lines

Add new variation

Variation name (optional)

PGN moves

Filter:

＋ Add new variation

0 selected

Difficult Positions

Lines ranked by difficulty — click any to drill it

Sort by:

Statistics

Overall

Activity — last 12 weeks

Today's session

All-time grade distribution

Line mastery breakdown

Pass rate — last 7 days

Per-opening breakdown

Lichess Game Explorer

No games loaded

Enter your Lichess username above and click Load games.

Take your time — click when ready to play

Annotation

No annotation for this move.

Moves played

Lichess Explorer

▼

⚡ Stockfish

Threads / ? cores

Click ▶ Analyse to run engine.

Session progress

Move

Moves after

Symbol

Annotation

Navigate to a move to annotate

⚡ Stockfish

Threads / ? cores

Click ▶ Analyse to run engine.

Add to Repertoire

Repertoire

PGN to merge

Learn from your Mistakes

Fetch your games and mistakes from your game history 🎮. Filter by time control, type of mistakes, and date range.

User Name

Type in your Lichess user name

Lichess API Token (optional — needed for evals)

Get one at lichess.org/account/oauth/token — scope: games:read

Select a start date

Click the calendar icon to bring up the calendar.

Select an end date

Click the calendar icon to bring up the calendar.

Mistake Types

Select which types of mistakes should be detected

Mistake (?) Blunder (??) Inaccuracy (!?) Dubious Move (?!)

Time Controls

Bullet Blitz Rapid Classical Correspondence

Max games to fetch

Games are fetched with computer analysis from Lichess (only analyzed games will have mistakes detected).

🔨 Repertoire Builder

Move

Moves after

Priority / ♟

Annotation

Navigate to a move to annotate

Side

⚡ Stockfish

Threads / ? cores

Click ▶ Analyse to run engine.

Play moves on the board to build your repertoire. Navigate with ← → keys or the buttons. Click Save Repertoire when done.

Tactics Sets

Select all 0 selected

Add a Puzzle Manually

Set up the starting position, play through the solution moves on the board, then save.

① Start Position

② Play Solution

Import from PGN (optional shortcut)

① Starting Position — position BEFORE any move is played

Paste a FEN string, or click ⚙ Set Up Position to drag pieces onto the board. The board will update live. Once the position looks right, click pieces on the board to record the solution.

② Solution Moves — opponent's first move + your answer(s)

Board method: After setting the start position, click pieces on the board to play moves — they appear here automatically.
Manual method: Type UCI moves directly (e.g. e1g1 d8h4 f1e2). The first move is the opponent's and is played automatically when drilling.

Themes (optional — click to tag)

Note (optional — your study notes for this puzzle)

Rating (optional)

Lichess-style puzzle rating. Used for display and filtering only.

Add to Set

or new:

Fetch Puzzles from Lichess

Puzzle Source

Fetches puzzles directly from the Lichess Puzzle Batch API — no file download or decompression required.
No account or token needed. Filter by theme and/or opening. Up to 200 puzzles per fetch.

Nb puzzles

Theme (pick one, or leave empty for mix)

Openings (optional — pick one or more)

Pulls puzzles straight from each opening you pick — “Nb puzzles” is split evenly across them. Add a Theme above to keep only puzzles that also match it.

Set Name

Re-using an existing name will merge new puzzles into it and preserve your progress.

Browse Puzzles

Sort by

Min rating

Max rating

Show

Position type (filters by puzzle starting position)

Filter by theme (click to toggle)

Select all 0 selected

Find the best move

Puzzle

Rating: —

Find the best move

📝 Puzzle Note

Moves

Move Notes

No note for this move.

⚡ Stockfish

Threads / ? cores

Click ▶ Analyse to run engine.

Session progress

Tactics Statistics

Overall

Today's session

Accuracy breakdown

Activity — last 12 weeks

Volume — last 7 days

Per-set breakdown

Tactics — Spaced Repetition Settings

Control how often puzzles repeat and how the scheduler reacts to your answers. These settings apply only to tactics puzzles and do not affect your opening drills.

⚠ Changes applied — navigate away to keep, or discard.

Openings — Spaced Repetition Settings

Control how often lines repeat and how the scheduler reacts to your answers. These settings apply only to opening drills and do not affect your tactics puzzles.

⚠ Changes applied — navigate away to keep, or discard.

Flashcards — Spaced Repetition Settings

Control how often flashcards repeat and how the scheduler reacts to your grades. These settings apply only to flashcard reviews and do not affect openings or tactics.

🔥 Difficult Puzzles

ECO Performance Dashboard

⌕

Filter by position — only count games where this position occurred

Your name

Optional — enter your username for win/loss from your perspective. Without it, stats count from White's perspective.

Collections

ECO Heatmap — win rate by category

No data <35% win 35–50% 50–65% >65% win

Full breakdown

ECO / OpeningGamesW / D / LWin%

🌐 Lichess Position Browser

Search millions of Lichess games from any position

⚡ Stockfish

🧵 / ? cores

Click ▶ Analyse to run engine.

Database

Speed

Rating

Since Until

Games at this position

Navigate to a position or paste a FEN to browse games from the Lichess database.

Game Analysis

Select all 0 selected

New Game

Move Tree

Tree actions

Move symbol

Annotation