Go: One Move
From 18 kyu to 9 dan — an opponent that matches your level
Free GameGo against KataGo AI, in your browser
This is a web Go (baduk) app you play against KataGo, the open-source Go AI. There is nothing to install and no account to create. Open the page and play a game.
What you get
18 kyu to 9 dan
Play KataGo at the level you want. Beginners can pick a beatable opponent, strong players an opponent worth a real fight.
9×9, 13×13 and 19×19 boards
Play a quick 9×9 game or a full 19×19 one, and choose whether you take black or white.
AI hints and score estimate
Stuck? See the points KataGo likes, and check who is ahead — and by how many points — at any time.
Free, on any device
A browser is all you need. The same board works on a phone, a tablet and a desktop.
How to play
- Tap Free Game and pick the opponent level (18 kyu – 9 dan), the board size and your colour.
- Tap a point on the board to aim, then confirm with “Play here”.
- To finish, pass twice in a row or tap Score.
Frequently asked questions
- What is KataGo?
- KataGo is an open-source Go AI released after AlphaGo. On top of superhuman playing strength it also learned to predict the score, so it can tell you how many points ahead each side is. The opponent on this site is the Go AI KataGo.
- Is it free? Do I need an account?
- Free games and scoring are free and need no account. Saved records and post-game analysis are member features still in preparation.
- Does it work on a phone?
- Yes. Any modern browser works — phone, tablet or desktop — with the same board and the same opponent. On a phone the Baduk Han Su app for Android and iOS is handier: it is the same opponent at the same levels, with your settings kept on the device.
Also on your phone
Go: One Move
Baduk Han Su is also available to download on Google Play and the App Store.