A liberty in Go is an empty intersection directly next to a stone or a connected group along the grid lines. You capture enemy stones by filling every one of their liberties, and mastering this single idea opens up almost all of the game’s fighting.
Liberties are the breathing spaces that keep stones alive. A group with liberties stays on the board; a group whose last liberty is filled comes off immediately. Everything from small skirmishes to huge invasions rests on counting these spaces accurately.
Counting Liberties Correctly
Count only the empty points touching your group along the lines, never the diagonals. A lone stone in open center has four liberties, an edge stone has three, and a corner stone has just two.
Connected stones pool their liberties and count as one group. Two stones joined along a line no longer have four each; they share a combined perimeter, which is usually more than either had alone. This is why connection is the backbone of strong play.
Here is a reliable way to count a group under pressure:
- Trace the outline of the entire connected group.
- Mark each empty intersection touching that outline.
- Ignore diagonal points and points already filled by any stone.
- Add the marked points together for your liberty total.
- Do the same for the attacking enemy group nearby.
- Compare the two totals to judge who wins the race.
The stone that fills the opponent’s final liberty captures, so an accurate count decides fights before they happen.
How Capturing Works
To capture, you reduce an enemy group to zero liberties by occupying its last empty neighbor. The moment that point is filled, the surrounded stones are lifted off and become your prisoners.
A group with exactly one liberty left is in atari, which means it can be captured on the next move unless it escapes. Escaping usually means extending to gain new liberties or capturing an attacker first.
| Situation | Liberties left | What it means |
|---|---|---|
| Healthy group | 3 or more | Safe for now, keep watching |
| Under pressure | 2 | Danger; plan a response |
| Atari | 1 | Capture threatened next move |
| Captured | 0 | Stones removed from the board |
Always announce or at least notice atari in your own groups first. Beginners lose most games by leaving a stone in atari and getting it snapped off for free.
Diagonal enemy stones do not remove liberties directly, so a group can look surrounded yet still breathe through gaps. Check the actual line-connected points before assuming a group is dead.
Atari and Escaping Capture
Atari is the state of having exactly one liberty left, and spotting it in your own groups is the first survival skill to build. A stone in atari will be captured next turn unless you act.
You can escape atari in three ways: extend to gain new liberties, capture the attacking stones, or connect to a friendly group with more breathing room. Extending simply adds a stone in the open direction, stretching the group toward more empty points. Capturing works when the stone attacking you is itself short of liberties, letting you take it before it takes you.
Sometimes escape is not worth it. A single stone deep in enemy territory may be better sacrificed than dragged out, because running only adds more stones to an eventual loss. Judging when to save and when to let go is a matter of counting the points at stake against the strength you would spend.
Watch for the difference between real ataris and bluffs. If the point your opponent would need to capture is one where their own stone would have no liberties, the threat is empty and you can ignore it. Reading one move ahead turns many scary-looking ataris into harmless noise.
Liberties and Group Safety
Beyond individual fights, liberties tell you how safe a group is over the long run. A group hugging the edge with few liberties is fragile, while one reaching into the open with many liberties can usually take care of itself.
The surest safety comes not from liberties alone but from two eyes, since a group with two eyes cannot be captured no matter how many outside liberties it loses. Liberties buy time; eyes buy permanence. Early on you rely on liberties, but the goal of any threatened group is to convert that time into two eyes.
Connection multiplies liberties for free. Two weak groups joined into one share a larger perimeter and become far harder to surround, which is why linking your stones is often the calmest, strongest response to pressure. A single strong group beats two weak ones almost every time.
Watch the direction you gain liberties, too. Extending toward open space adds more breathing room than extending toward your opponent’s wall, where new points are quickly filled. When you must run, run toward the emptiest part of the board, and you will keep the liberty advantage that decides the fight.
Winning Capturing Races
When two groups surround each other, the one that fills the enemy’s last liberty first survives. This race is called semeai, and counting decides it more often than clever moves.
If both groups have the same number of outside liberties, the player to move usually wins. That single tempo tips an even race, so knowing whose turn it is matters as much as the raw count. When your group has one more liberty, you can often win even after the opponent moves first.
Shared liberties between the two groups count for both sides, which changes the math. In a race with shared liberties, fill your opponent’s exclusive liberties first and save the shared ones for last.
Eyes complicate everything in a good way. A group with two real eyes cannot be captured at all, because the opponent can never fill both internal points at once. Learning to count outside liberties against groups with and without eyes is the next step after basic capturing, and it turns liberty counting from arithmetic into genuine strategy.