Keima Shimari

The keima shimari is a standard corner enclosure where one stone is placed on the 3-4 or 4-4 point and the second stone is positioned at the 5-3 point, forming a small knight’s move structure. This shape effectively secures the corner while allowing for further development along the side.

Compared to looser enclosures, such as ogeima shimari (large knight’s move enclosure), keima shimari is more compact and emphasizes stability. It is particularly effective for creating solid territorial foundations early in the game.

Tactical Application

• Strengths of keima shimari:
  
  • Ensures a high probability of converting the corner into territory.
  • Provides a strong defensive structure that is difficult to invade.
  • Fits well in territorial and balance-oriented fuseki strategies.

• Weaknesses and Considerations:
  
  • Lacks outward influence compared to larger enclosures.
  • Can be subject to reduction or probing techniques by the opponent.
  • May require additional moves for further reinforcement if the opponent applies pressure.

Historical and Modern Use

The keima shimari was one of the most dominant opening patterns around the 1960s, particularly during the era of 4.5 komi. At that time, securing solid territory was often prioritized, and this enclosure was a reliable way for Black to establish a stable position.

With the universal adoption of komi, White gained more incentive to approach early rather than allowing Black to complete this formation. The rise of more influence-based openings, such as the Orthodox fuseki, has somewhat reduced the prevalence of keima shimari in high-level play. However, it remains a fundamental structure in professional and amateur games alike.

For a masterclass on how keima shimari fits into classic and modern opening theory, check out our Principles of a Glorious Opening course.