Chess · jordin.dev

Black

White

Play chess over sound

With someone nearby: both open this page, volume up. One invites, the other joins. Moves travel through the air, so keep the devices within a few metres. A third device can watch (it only listens) and see Stockfish's evaluation; the players don't.

Sound: Near-ultrasonic, sturdy

Band Speed Volume

The inviter's band is used by both (the joiner hears it in the invite). Near-ultrasonic is quiet to most adults; if a device can't hear it, use Audible.

How it works

Each move is a few bytes (squares, promotion, the mover's clock) sent as data over sound. White transmits in one band and Black in the other, so both can speak at once and neither hears its own sound as a move. Every message is repeated until the other side acknowledges it, so a missed one only costs a few seconds. A game ID keeps two games in one room apart. Nothing goes over the internet.