The Stone Board
Chess in marble, gold and mineral
Standard chess with pieces cut from different materials. The opponent and your record run on this device — no account and no game backend required.
On this device
The engine does not call a remote AI service. Progress stays on this device.
New game
Pick who you play, your colour and how strong the engine is.
Opponent
You play
Board in Pass & Play
Engine level
Pieces
Marble
Chess game
White to move
Piece sets
The rules never change. Only the material does. Each set differs between the two sides by more than colour: dark pieces carry a double notch on the base, light pieces a single pip.
Rules Lab
Load any position, try a move, and see why it is or is not legal. Nothing here is saved.
Tap a piece, then tap where you think it can go.
Record
Games against the engine, kept on this device only.