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Faster than Light Chess

Spectator vs Waiting

Disconnected v23

- Standard

White to move Waiting for moves.

Ready

Ready

White vs Black

Opponent view What Black knows right now

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PGN

New room

PartyKit host

Room

Game type

Choose before connecting.

Clock

Minutes

Increment

Display name

Play vs computer

Play locally against the built-in engine.

Side

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Room code or name

Display name

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How to Play

Standard Mode

Google it. Docs only available for light-speed mode.

Light-speed Mode

In light-speed mode, information takes time to travel. You can only see what your pieces can observe.

How visibility works

Your opponent's moves become visible based on how close your pieces are to what happened. If your knight is 3 squares from where your opponent moved, you'll learn about it in 3 turns. The closer your pieces, the faster you get intel.

What you can see

Departures: You'll notice when a piece vanishes from a square — but only once your pieces are close enough to spot the gap.
Arrivals: You'll learn where a piece landed — again, based on proximity.
Captures: If your opponent takes one of your pieces, that piece disappears from your board immediately. You know it was captured.

Important: Taking pawns

You can take your opponent's pawn without them seeing it — if none of their pieces are close enough to the capture square. The pawn will simply vanish from their view. They'll figure it out eventually, but not right away.

The opponent's view

The same rules apply to you. Your opponent (or the CPU) sees the board through their own fog of war. If you move a piece far from their scouts, they won't know what you did.

Move notation

Moves you can't fully see appear as ? in the move list. You might see ♘? (a knight moved, but to where?), ?xe4 (something captured your e4 pawn), or ??? (complete mystery).