Learn CrystalGo

Fixed points. Changing connections. Explore seven recorded demonstrations on the real board, then play both sides locally.

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Every position is replayed from the exact empty starting board, with its full history. These lessons do not use or change saved games.

Complete record from the empty board

Select a turn to view it. Rejected test actions are not part of this record.

The rules to keep together

One turn: Place one stone, flip one eligible empty center, or pass. A flip uses the whole turn.
Connections: Only drawn tile sides connect points. The boundary is fixed and there is no wrapping.
Capture: Remove all opposing groups without liberties, then reject the action if any group of the mover has no liberties.
Repetition: Compare the entire tile pattern and all stones after captures with every earlier position. Passes retain history.
Finish: Two consecutive passes end play. Count stones and exclusively bordered empty components on the actual board. No automatic dead-stone removal or same-game resumption.

Zero komi is provisional. Playing pairs with colors swapped equalizes assignment of the first move; it does not establish equal winning chances or a fair komi.

Select a stone to inspect its group and distinct liberties. Use the board’s arrow keys to move focus, then Enter or Space to select. The replay slider and turn buttons show every action, including setup moves.