Score
Tap any stone that is dead to remove it — tap again to put it back. The count updates as you go. Japanese/Korean territory scoring, komi 6.5: you score the empty points you surround plus the stones you captured, and your own stones on the board are not points. Play currently enforces simple ko.
Review
This game
Strength weakens the engine; these are not ranks and not calibrated to one. Below “Full” it picks from its top candidates at random rather than always the best, so it still plays good shape and then makes moves no player of any particular level would.
Learn
Eight tasks on the rules themselves — liberties, atari, capture, escaping, suicide, ko, territory. No model needed, so it works before one is loaded.
Living and killing small groups. Every answer is settled by an exhaustive search rather than by anyone's opinion, so it holds to the same standard as the rules track.
Shapes worth recognising. Unlike the two tracks above, the advice here is not proved — only the liberty counts are checked. Every card says so and states when it is wrong.
Games
Model
The model loads itself on launch and is cached on the device. You only come here to change it, or after a corrupted copy has been discarded.