Hiraki

Hiraki refers to an extension move in Go, where a stone is placed a few spaces away from an existing stone or formation along the side of the board. This move helps with territorial development and defensive positioning. By extending outward, hiraki secures potential territory while limiting an opponent’s ability to expand.

There are different types of hiraki based on the distance from the original stone:

• One-space extension – Provides stability and strengthens local shape.
• Two-space extension – Balances stability and flexibility, commonly used for territorial expansion.
• Three-space or wider extensions – Prioritizes influence and long-term development but may be vulnerable to invasions.

A hiraki move can be played from a single stone, a corner enclosure, or a wall of connected stones. It differs from a jump, which extends toward the center rather than along the side. A move directly next to an existing stone, on the other hand, is called a stretch or solid extension.

Strategic Importance

Hiraki is a fundamental move in fuseki (opening strategy) and is used to control key areas early in the game. Proper spacing in hiraki balances defense and expansion, preventing an opponent from easily invading. The effectiveness of hiraki depends on the opponent’s potential responses, requiring good positional judgment. Mastering hiraki helps players develop efficient structures and maintain flexibility throughout the game.

If you want to learn more about extensions in the beginning of the game, check out Extensions — How Far is not Too Far lesson from the 19×19 course, as well as our Opening course.