Extension

Definition

An extension is a big fuseki point that extends an existing configuration of one or more stones along the side, leaving several spaces between the played stone and the existing stones. It outlines potential territory towards the edge and/or blocks the opponent's extension (checking extension).

Extensions are called "one-space extension", "two-space extension" etc. according to its distance from existing stones. Though they are usually played on the same line as an existing stone, it's possible to play one line higher or lower.

Because moving along the side is so important, it is distinguished from moving toward the center, which is instead called a jump. If a stone is played directly next to an existing stone, it would be called a stretch or solid extension.

Examples

Examples of extensions  

is an extension from a corner enclosure.

is an extension from a single stone.

is an extension from a wall.

See also

• Two-space extension
• Three-space extension
• Four-space extension
• Five-space extension
• High one-space extension
• Naming extensions, jumps and pincers
• Short extensions
• Extending from a single stone
• Extending from an enclosure
• Extension from a wall
• Double extensions
• Invasions on the side
• Extending on third or fourth Line
• Six-space extension test