Online Go Board Game
Play the ancient strategy game of Go with territory scoring and capture rules. Adjustable board sizes from 9x9 to 19x19.
Runs in your browser. No data leaves your device.
Frequently Asked Questions
How do I play Go?
The game implements full Go rules on 9x9, 13x13, or 19x19 boards. Stone placement checks liberties via flood-fill group detection, removes captured opponent groups with zero liberties, and rejects suicide moves and ko violations using board-state hashing (positional superko). Two consecutive passes enter a scoring phase where players mark dead groups. Territory is calculated by flood-filling empty regions, using Japanese scoring with 6.5 komi.
What board sizes are available?
9x9 (quick games, good for beginners), 13x13 (medium), and 19x19 (standard tournament size). Smaller boards have shorter games and are great for learning the rules and basic strategy.
How is the score calculated?
Scoring counts the territory (empty intersections) you surround plus any opponent stones you captured during the game. The player with more combined territory and captures wins.
Is Go harder than chess?
Go has simpler rules but far more possible positions than chess. The strategy is deeply intuitive -- surrounding territory and reading the balance of power across the board. It is easy to learn but takes a lifetime to master.