So far, you've learned about liberties, capturing, and atari.
Now it's time to answer an important question:
How do stones stay alive?
The answer is eyes.
Eyes are one of the most important concepts in Weiqi. They determine whether a group can survive or whether it can eventually be captured.
At first, the idea may seem confusing, but once you understand it, you'll begin to see the board in a completely different way.
What Is an Eye?
An eye is an empty point that is completely surrounded by your own stones.
Think of it as a safe space inside one of your groups.
Because your opponent cannot simply play inside a true eye without breaking the rules of the game, eyes help keep a group alive.
The more secure your eyes are, the harder it becomes for your opponent to capture your stones.
Future Diagram
A simple group with one eye highlighted.
Caption: "An eye is an empty point completely surrounded by your stones."
Why Are Eyes Important?
Imagine a group that has survived several attacks.
Even if your opponent surrounds the outside of the group, they still cannot capture it immediately.
Why?
Because the group still has liberties inside its eyes.
As long as those internal liberties exist, the group continues to breathe.
This is why experienced players often say they are "making eyes" instead of simply protecting stones.
Their goal is long-term survival.
One Eye Is Usually Not Enough
Many beginners believe that having one eye means a group is safe.
Unfortunately, that isn't true.
A group with only one eye can often still be captured.
Eventually, your opponent may be able to remove all of its remaining liberties.
One eye is certainly better than none, but it does not usually guarantee survival.
Future Diagram
A group with one eye that can still be captured.
Two Eyes Keep a Group Alive
This is one of the most famous ideas in Weiqi.
A group with two separate true eyes cannot normally be captured.
Why?
Your opponent would need to fill both eyes.
But filling the first eye would leave your group with liberties in the second eye.
Trying to fill the second eye would become an illegal self-capturing move before your group could be removed.
As a result, the group remains alive.
This is why players work so hard to create two eyes during a game.
If you want to apply this idea in real games, read the guide to knowing whether a group is alive.
Future Diagram
A living group with two eyes.
Caption: "Two true eyes make a group alive."
True Eyes and False Eyes
Not every eye is a real eye.
Sometimes an empty point looks safe but can actually be invaded.
These are called false eyes.
False eyes often occur when the surrounding stones are not fully connected or when your opponent can still play inside legally.
For a clearer beginner explanation, read What Is a False Eye in Weiqi?.
Beginners don't need to master false eyes immediately.
For now, simply remember that not every empty space inside a group guarantees survival.
You'll learn more about eye shapes as your skills improve.
Future Diagram
Compare:
- One true eye
- One false eye
Making Eyes During a Game
Creating eyes is not something that happens only at the end of the game.
Strong players think about eye shape throughout the game.
When building a group, they constantly ask:
- Can this group eventually make two eyes?
- Does it have enough space?
- Is it becoming too cramped?
- Can my opponent prevent my second eye?
Learning to ask these questions early helps you build stronger positions and avoid unnecessary danger.
Eyes and Territory
Eyes and territory are closely related, but they are not the same thing.
An eye exists to keep a group alive.
Territory exists to score points.
Sometimes an area serves both purposes.
Other times, a group may be alive with two eyes while controlling only a small amount of territory.
Understanding this difference helps you make better strategic decisions later in the game.
Common Beginner Mistakes
Assuming one eye is enough
One eye often isn't enough to guarantee survival.
Most groups need two true eyes.
Confusing territory with eyes
An enclosed area does not automatically become an eye.
Its purpose depends on the surrounding position.
Ignoring eye shape until it's too late
Strong groups are built gradually.
Don't wait until your stones are already surrounded before thinking about making eyes.
Believing every empty point is a true eye
Some empty spaces can still be invaded.
Learning the difference between true and false eyes takes practice.
Quick Recap
Before moving on, remember these key ideas:
- An eye is an empty point surrounded by your stones.
- Eyes help groups stay alive.
- One eye is usually not enough.
- Two true eyes normally guarantee survival.
- Not every eye-shaped space is a true eye.
Frequently Asked Questions
Why can't my opponent simply fill both eyes?
Because after filling one eye, your group still has liberties in the other.
Attempting to fill the final eye would usually become an illegal self-capturing move.
Can a group survive without two eyes?
Sometimes, depending on the surrounding position.
However, beginners should generally aim to create two true eyes whenever possible.
What is a false eye?
A false eye looks like an eye but does not actually guarantee survival because your opponent can still invade or reduce it.
Should I always build two eyes immediately?
Not necessarily.
During the opening and middle game, players often build influence first and create secure eyes later as the position develops.
Continue Learning
Now that you understand how groups stay alive, it's time to learn why you're trying to keep them alive.
The goal of Weiqi is not simply survival.
It is to control territory.
In the next lesson, you'll learn what territory is, how it is formed, and why it determines the winner of the game.