Free beginner course
From placing your first stone to captures and territory on 9×9, learned by playing.
10,000+ problems
Sorted by theme, from atari to life and death, with layered hints and explanations.
KataGo on your phone
A state-of-the-art engine that runs on your device, not a server. Works offline.
18 kyu to amateur 4 dan
22 levels that make the mistakes a real player at that rank makes.
No account. No ads. 9×9, 13×13 and 19×19 boards, with game review and a win-rate graph.