Chess with hidden information

Every piece is everywhere until you look.

You learn which piece moved — never where it went. Violet ghosts mark every possibility. Your attacks measure them into fact.

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You played Nf3. Black moved their knight — now make your move.

How it works

Observation collapses the board.

Standard chess rules. One twist: your opponent's quiet moves hide their destination. Deduction, bluffing, and probing — played on a board that only resolves when you look.

Hidden destinations

When your opponent moves, you learn the piece — not from or to. The move list shows a symbol and an ellipsis, not a square.

Superposition

The piece spreads to every square it could legally reach. Violet ghosts pulse on your board. Amber pieces are what you know for certain.

Measurement

When your certain pieces threaten a square, the game resolves whether a ghost is really there — and narrows what your opponent knows about you.

In the game

Uncertainty you can see.

Opening uncertainty

Two squares, one knight.

Black develops a knight after your Nf3. You know it moved — you see it on a6 and c6 at once. Only one is real.

Chess board showing a knight in violet superposition on two squares

Compounding uncertainty

Ghosts multiply.

Move the same piece again without being seen — its ghosts spread to every square it could have reached from each possible position. One knight, three squares.

Chess board with several opponent pieces shown as violet ghosts

Perspective

Through your opponent's eyes.

Toggle the view mid-game. See your own pieces the way they see them — certain or spread across the board.

Chess board in opponent-view mode with violet frame glow

Full chess

Real rules. Hidden facts.

Kings and queens always visible Check and checkmate stay unambiguous — royals never enter superposition.
Every standard rule Castling, en passant, promotion, threefold repetition, fifty-move draw — all adjudicated on the real board.
Play at your pace Invite a friend by username. Take your turn when you're ready. Resume any active game from the lobby.

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