4-4 Point

  Difficulty: Beginner   Keywords: Opening, Joseki

Chinese: 星位 (xīng wi)
Japanese: 星 (hoshi)
Korean: 화점 (hwajeom)

[Diagram]
4-4 point  

The 4-4 point is the corner star point (aka hoshi) on a 19x19 board, indicated by a bold dot. It has been far more popular as an opening in modern go than it was historically. Only in the twentieth century, and especially with the introduction of komi, did it begin to rival 3-4 point and 3-5 point openings as a common corner move.

[Diagram]
4-4 point  

A stone on the 4-4 point strikes a balance between influencing the center and defending the corner. It isn't as secure, territorially, as any of the moves mentioned above (though the 3-5 is biased towards the side, rather than the corner).
One could say the 4-4 point doesn't defend the corner at all, rather it defends the center and sides from the corner. To illustrate, an unsupported 3-3 invasion under the star point inevitably takes the corner, but gets sealed in on all sides.

Approaches

[Diagram]
4-4 Point approaches  

The common approaches (by white in the example) for the 4-4 point includes a, b, c and d. See 4-4 point josekis for more.

Enclosures

4433Enclosure 4434Enclosure 4435Enclosure 4463Enclosure 4473Enclosure 4464Enclosure 4474Enclosure

Generally speaking, the 4-4 point does not aim at creating a secure corner territory. A second move (by black in the example) begins the enclosure process. However, even after a second move, the corner is open to invasion. These moves often arise in handicap games, though, or as a response to an approach.

[Diagram]
The 4-4, 3-5, 6-3 enclosure  

This corner is secure. black+circle is the "orthodox" method of preventing invasion after the 4-4 and 6-3 enclosure. However, it has taken Black three moves to perfect his corner, in comparison to a two-move enclosure based upon one of the other common openings.

Extensions

Despite the inferiority of the 4-4 in a territorial sense, the high position of the stone means that good extensions are immediately possible. Unlike the 3-4 point, there are no urgent moves in the corner.

[Diagram]
Long Extensions  

With black+circle as his opening move, Black would like to extend to both a or b and d or e; both are consistent with the center-oriented 4-4 point. The sanrensei opening involves playing black+circle, b, and c (Or e and f); the nirensei, black+circle and c or f. This sort of move, emphasizing influence and quick development, is more likely than an enclosure based on the 4-4 point.


Further reading:


4-4 Point last edited by 50.171.17.228 on April 16, 2014 - 03:21
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