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Bullet to daily time controls against a built-in engine, 70427 puzzles verified move by move, and games against friends over a plain link. No account, no sign-up.

Time control

Bullet, blitz, rapid, classical: just categories by starting time. The numbers (like 10+0) are minutes, then seconds added back after each move. Slower means more time to think.

The elephant on the board

Chang (ช้าง) is the Thai word for elephant. It is also, by a long detour, a chess piece. The game began in India as chaturanga, whose four divisions were infantry, cavalry, chariots and elephants.

The elephant travelled west and changed its name at every border: gaja in Sanskrit, al-fil in Arabic, alfil in Spanish, and at last the bishop in English and the fou in French. It never left Russian, where the same piece is still slon, elephant, nor Chinese chess, where it is written 象. Thailand kept a game of its own, makruk, played there to this day.

Sixty-four is the rest of the name: the squares. chang64 is the elephant on the sixty-four squares, a piece that crossed a thousand years and half the world, on a board that never changed.

My progress

Level and rating come from the Puzzles ladder alone. Solved and best streak also count the puzzle of the day. Day streak counts only the puzzle of the day. Chang Sprint and Coordinates keep their own records, on their own cards, and never move these numbers.

1LevelPuzzles
0SolvedPuzzles, daily
0Best streakPuzzles, daily
800RatingPuzzles
0Day streakPuzzle of the day
Your progress will show up here.

Board editor

Set up any position to study it: check an idea from a book, a puzzle you saw elsewhere, or an endgame, without replaying a whole game to get there. Pick a piece below, then tap a square. Tap a piece already on the board to remove it.

3:00Left 0Score ✗✗✗Strikes
Find –
30.0Seconds 0Correct 0Missed
Computer
0.0

Tap ✓ or ✗ to see how it was solved.

You

Pick a colour and a strength, then play.
Settings

Choose your colour, the engine's strength and a time control, then start.

Time control

Bullet, blitz, rapid, classical: just categories by starting time. The numbers (like 10+0) are minutes, then seconds added back after each move. Slower means more time to think.

Scoresheet

Leaving the page won't lose your game: it saves automatically in this browser, ready to pick up again.

#WhiteBlack
No moves yet
Review

The bar shows the engine's opinion, not certainty. "M4" means mate in 4 moves.

Analysing a finished game downloads Stockfish (about 7 MB, once) and uses it automatically. Stockfish never helps you while you play.

–Accuracy
0Blunders
0Mistakes

Your games

Saved only in this browser. No account: clearing your browsing data or switching devices loses it.

PGN

PGN is the standard notation format for chess games, readable by most chess sites and software.

Pieces
Side to move
FEN

A short line of text that describes a position: which piece is on which square, whose turn it is. It's the standard way to save or share a position, readable by most chess sites and software.

Continue on another device

Your progress is stored on this device. To pick it up elsewhere, copy this code and paste it there.

Reset my progress

Clears your level, badges, streaks and calendar on this device. This can't be undone.

Train one pattern

Pick a tactic and drill it. Your level and streak stay where they are.

Back-rank mate

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Find the winning move.

Play a move, or use Hint, to unlock the next puzzle.

Level 1 of 10First mates
0Solved
0Streak
0Best
800Rating
Rating over time

One point per exercise you complete. It only tracks your own progress against past-you, not a certified skill level. See the "Elo rating" glossary entry for more.

Mistakes to review

Puzzles you've gotten wrong, from any mode. Tap one to try it again. Each success spaces it out further before it comes back. Solve it enough times and it drops off this list for good.

My history
Personal records

Your best-ever times: quickest first-try solve, and the most puzzles solved in a single day. These stay even if a later day is quieter.

–Fastest solve
0Best day
Badges

Milestones for volume, daily streaks and rating. Once unlocked, a badge stays unlocked even if the number behind it later drops.

0/41 unlocked

See all badges
0Day streak
Daily puzzle calendar

Highlighted days are puzzles of the day you've solved. Tap one to see it again with the solution shown.

See full calendar

Queen vs King

Pick an endgame below.
Endgame
0Moves used
12Target
–Personal best
Chang Sprint

Personal best: 0

Coordinates

Personal best: 0

Play a friend

Each move produces a link. Send it, your friend plays, they send theirs back.

Start a game.
My position

New game
Pace
Invite to chang64
Scoresheet
#WhiteBlack
No moves yet
Your friend games

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Chess on YouTube

The latest video from each channel, updated automatically.

Explore

Daily puzzle calendar

Every day you've solved the puzzle of the day. Tap a highlighted day to see it again.

Back

Preferences

Kept on this device. Nothing is sent anywhere.

Board colours
Piece animation

Pieces slide to their square when a move is played. Turn it off if you prefer an instant board.

Accessibility

Screen reader announcements

Keyboard