False Eyes in Go: Why Some Eyes Don't Count for Life

⏱ Read ~5 min · Updated July 2026 · Part of: Learn Go

A false eye is the cruelest trap in beginner Go: it looks exactly like a real eye, but doesn't count. You make two "eyes," but one is false — your group is still dead.

1. Why two eyes matter

A group with two real eyes can never be captured — the opponent filling either eye would run out of liberties first. That's the entire life rule. So the goal is clear: make two eyes.

🪤 The trap: some empty points look like eyes but aren't "real." Count them, and you think you're alive — but you're dead.

2. What makes an eye "false" (how to judge)

For an eye to count as "real," its diagonal control must be secure. Specifically:

👁️ Look at the diagonal points around the eye (not the orthogonal neighbors — the four diagonals). Of the eye's four diagonals, your side (or empty) must control enough:

• Corner eye: of 4 diagonals, your side controls ≥2 → real; otherwise false.
• Edge eye: of 3 diagonals, your side controls ≥2 → real.
• Center eye: of 4 diagonals, your side controls ≥3 → real.

When the opponent controls too many diagonals → they can eventually cut in and fill this eye → the eye is false.

3. A false-eye position

The center point (1,1) is surrounded by black stones (0,0)(1,0) — it looks like an eye. But the diagonals (0,1) is white and (1,2) is white — the opponent controls 2 diagonals. White can eventually cut in and fill this "eye." It's a false eye; it doesn't count for life.

4. The classic beginner loss

You surround a group, see two empty points inside, and relax. But one is a false eye — the opponent plays inside, fills the real eye, and captures the whole group. You never saw it coming because that eye "looked fine."

😱 This is why you train tsumego: drill the true-eye / false-eye judgment until you can't be fooled.

5. The 4 most common false-eye mistakes for beginners

1. Not counting diagonals, just checking "is there an empty point." An empty point ≠ a real eye. Check diagonal control — opponent controls too many = false eye. Build the habit "see an eye, count diagonals."
2. Counting a false eye toward two eyes. If one of your "two eyes" is false → still dead. Only count real eyes.
3. Making an eye without securing the diagonals. Making an eye isn't just surrounding a point — you must ensure the surrounding connections are solid and diagonals are yours. Scattered shapes can't make real eyes.
4. Discovering an eye is false only after being cut. The opponent cuts your eye's diagonal → eye becomes false. Don't wait to find out — secure the diagonals when making the eye.

6. How to defend against false eyes

• Connect your stones to make the eye's diagonals secure — connected shapes make real eyes.
• Don't rely on one cramped hollow — make eye shapes with space, not a squeezed single point.
• Only count real eyes — if one of your "two eyes" is false, make another.

7. On the 4×4 board

The small board makes eye status easy to verify: few points, so which diagonal is controlled is immediately clear. brainGO's life-and-death puzzles reward you for seeing through false eyes at a glance.

How to train it

Train with puzzles where "the false eye is the whole trap" — learn to see the difference.

👉 Play brainGO — don't be fooled

FAQ

How do you tell if an eye is real or false?

Look at the eye's four diagonal points (not orthogonal neighbors). If your side (or empty) controls enough (corner ≥2/4, edge ≥2/3, center ≥3/4) → real eye; otherwise false. Simply: "diagonals secure = real, diagonals controlled by opponent = false."

Why doesn't a false eye count for life?

Because the opponent can eventually cut in and fill it (unlike a real eye which can't be filled). Fill the false eye → group loses an eye → not enough for two → dead.

I made two eyes but one is false — is the group alive?

No. Both eyes must be real. One real + one false = only one real eye = dead. When making eyes, ensure both are real.

How do I avoid making false eyes?

When making an eye, ensure the surrounding connections are solid and diagonals are yours. Scattered shapes (easy to cut) can't make real eyes — connect first, then make the eye.

Can a false eye become a real eye?

Yes — if you can win back the diagonal points controlled by the opponent. Common ways: connect your scattered stones around it, or capture the opponent stone that controls your diagonal — the false eye "upgrades" to real. But note: if the opponent keeps pressing your diagonal, the false eye stays dead — you can't turn it real by "waiting," you must actively connect or attack. In practice, rather than rescue a false eye, it's better to make solid connections before making the eye in the first place.

I have one real eye and one false eye — can the group live?

No. The life condition is two real eyes — one real + one false equals only one real eye, and the opponent can fill the real eye and capture the whole group. Many beginners think "I have two eyes" without noticing one is false, and collapse when the opponent fills it in one move. When judging, always "count only real eyes" — false eyes don't count. If you're unsure, default to conservative: treat it as false and find a way to make a third real eye.

Related guides

• Learn Go: the visual beginner's guide — the beginner hub (this article's home)
• The eye — what a real eye is
• Alive and dead (two eyes) — the life rule
• Basic life-and-death shapes — which shapes live and die
• Connect and cut — solid connections make real eyes
• Tsumego — drill true/false eye judgment