Go

How to play

• Players take turns placing a stone on an empty point. Black goes first.
• A stone or connected group with no empty points next to it is captured and removed.
• You can't play a move that would leave your own stones with no liberties, or repeat an earlier position (ko).
• When there's nothing useful left, both players pass. Dead stones are removed and the score is counted.

Scoring

This game uses area scoring, as in Chinese rules: your living stones plus the empty points you surround. White receives 7.5 points of komi for moving second, or 0.5 in handicap games. After both players pass, you can tap groups to mark them dead or alive before accepting the result.

About the AI

Levels 1 to 3 use simple built-in rules. Levels 4 and up use KataGo neural networks, running entirely in your browser with TensorFlow.js. Nothing you play leaves your device.

KataGo networks © David J Wu ("lightvector"), MIT licence. Network layers adapted from web-katrain. TensorFlow.js, Apache 2.0. Licences