How to play

Black moves first. Tap any empty intersection to place a stone there; players alternate.
Capturing: a stone or connected group with no empty point (liberty) left next to it is captured and removed. You can't play a move that would leave your own new stone with zero liberties (suicide) unless it captures.
Ko: you can't immediately recapture in a way that would recreate the position from just before your opponent's last move.
Scoring: two passes in a row end the game — score is stones on the board plus fully-enclosed empty territory, counted immediately, no negotiation step. Capture anything you consider dead before you pass, or it counts as a live stone.
White gets a komi of 7.5 points to offset Black's first-move advantage, so there are no draws.
Online games get a clock sized to the board (10/20/30 minutes per side for 9×9/13×13/19×19). Running out of time loses.

Go

The ancient territory game, on a 9×9, 13×13 or 19×19 board. Play a friend online with challenges, a rating and match history, take on the built-in computer, or pass-and-play on one device.

Play online

Challenge a friend by name or code, or anyone in the lobby. A ready-check on both sides, a board-sized clock each, and every result feeds a separate Go rating.

Vs the computer

A built-in bot that captures, defends its groups and avoids filling its own eyes — entirely in your browser, no server-side engine.

Pass & play

One board, one device, no sign-in. Pick 9×9 for a quick game or 19×19 for the full board.

Full rules

Captures, the suicide rule, ko, and strict area scoring with a 7.5-point komi — no draws, no dead-stone arguments.

Your turn: tap any empty intersection to place a stone there. Black plays first.
Capturing: a stone or group surrounded on every liberty is removed. You can't play a move that leaves your own new stone with no liberties unless it captures — and you can't immediately retake a single-stone ko capture.
Ending the game: pass twice in a row and the game scores itself — stones on the board plus territory you've fully enclosed. Capture anything you think is dead before you pass, since nothing gets removed automatically.
Komi: White gets a 7.5-point head start to balance Black's first move, so every game has a winner.
Online clocks scale with the board (10/20/30 minutes a side for 9×9/13×13/19×19). Let your clock run out and you lose.

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How to play

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Vs the computer

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