Go
Surround territory and capture stones on 9×9 and 13×13 boards.
Play level 1 Two players, one device
Level 1: One Liberty. Play D5 to capture 1 black stone.
Rules
Goal: Control more of the board than your opponent: your stones plus the empty points only you surround. White adds komi.
- Black plays first unless the level says otherwise. Stones are placed on the intersections and never move.
- A stone or connected group with no empty neighbouring points (liberties) is captured and removed.
- Suicide is not allowed: you may not place a stone that would have no liberties unless it captures.
- Positional superko: no move may recreate an earlier whole-board position (this covers ko).
- You may pass. Two passes in a row end play. Score is your stones on the board plus empty points surrounded only by your stones, plus komi for White.
- Groups that cannot escape capture are marked as dead and scored for the other side. If that is uncertain, play resumes so it can be settled. Draws do not clear a level.
Controls: Tap or click an intersection to place a stone. Each group can show its liberties. Pass with the Pass button. With a keyboard, use the arrow keys and Enter.
The ten levels
Levels 1 to 7 are free and open one at a time. Levels 8 to 10 are expert challenges with Premium.
- One Liberty Capture one black stone. Play D5 to capture 1 black stone. Available
- Capture a Chain See the shared liberties of a connected group. Play D5 to capture 2 black stones. Locked
- First Area Win Connect groups and score area. Win by at least 1 point after area scoring, including White komi. Locked
- Corner Balance Choose between local replies and new areas. Win by at least 1 point after area scoring, including White komi. Locked
- Light Stones Keep groups flexible near the edges. Win by at least 1 point after area scoring, including White komi. Locked
- Two Stone Challenge Play White against two starting black stones. Win by at least 1 point after area scoring, including White komi. Locked
- Wide Board Manage multiple groups on a larger board. Win by at least 1 point after area scoring, including White komi. Locked
- Three Stone Trial Overcome a three stone handicap as White. Win by at least 3 points after area scoring, including White komi. Premium
- Four Corners Outscore a stronger local bot despite four opposing stones. Win by at least 5 points after area scoring, including White komi. Premium
- Five Stone Final Convert territory under a larger handicap and tighter clock. Win by at least 7 points after area scoring, including White komi. Premium
Strategy tips
- Count liberties
- A group with one liberty is in atari: it is captured on the next move unless you add liberties or capture first.
- Two eyes live
- A group with two separate eyes can never be captured. Make sure your groups have room to form them.
- Corners, then sides, then centre
- Corners need the fewest stones to surround territory, so play there first.