What is good shape in Go?

Good shape is an efficient arrangement of stones that maximizes liberties, eye potential, and flexibility while being hard to cut or attack. It gets the most strength from the fewest stones.

What is the empty triangle?

The empty triangle is three stones in an L-shape around an empty point. It's the textbook example of bad shape because it's inefficient — the same three stones in a straight line have more liberties and better eye potential — and it usually signals a better move exists.

How do I learn good shape?

Learn a handful of core shapes — the tiger's mouth, bamboo joint, and one-space jump — and get in the habit of avoiding the empty triangle. Reviewing your games for clumsy stones trains your eye quickly.

Good Shape and Bad Shape

Shape is the Go player's word for how efficiently your stones work together. Good shape does a lot with few stones — flexible, hard to attack, quick to make eyes. Bad shape does the opposite, clumping stones where they overlap and waste each other's strength. Learning a few shapes instantly improves every game.

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Why shape matters

Two groups can use the same number of stones and be worlds apart in strength. Good shape squeezes maximum liberties, eye potential, and flexibility out of each stone; bad shape leaves stones tripping over one another. Because Go rewards efficiency, recognizing good and bad shape is one of the fastest ways to get stronger.

Shapes worth knowing

Tiger's mouth: three stones around an empty point — a strong, flexible way to connect.
Bamboo joint: two pairs of stones that can't be cut apart — rock-solid.
One-space jump: a fast, efficient way to extend that's hard to cut.
Empty triangle: three stones in an L with an empty point — the classic bad shape to avoid.

Avoiding the empty triangle

The empty triangle is the most famous bad shape in Go: three stones forming an L around an empty point. The same three stones placed in a straight line have more liberties and better potential, so the empty triangle is a reliable sign you've played inefficiently. When you notice yourself about to make one, there's almost always a better move.

The empty triangle: three stones around the marked empty point. The same stones in a straight line would be more efficient.

Frequently asked questions

What is good shape in Go?: Good shape is an efficient arrangement of stones that maximizes liberties, eye potential, and flexibility while being hard to cut or attack. It gets the most strength from the fewest stones.
What is the empty triangle?: The empty triangle is three stones in an L-shape around an empty point. It's the textbook example of bad shape because it's inefficient — the same three stones in a straight line have more liberties and better eye potential — and it usually signals a better move exists.
How do I learn good shape?: Learn a handful of core shapes — the tiger's mouth, bamboo joint, and one-space jump — and get in the habit of avoiding the empty triangle. Reviewing your games for clumsy stones trains your eye quickly.

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