4-4 point 3-3 invasion, extension

PageType: Path   Difficulty: Beginner   Keywords: Joseki

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The 4-4 point 3-3 invasion simple extension is a common and popular modern joseki ever since the AI revolution. It is a basic move that is played at all skill levels, is well-regarded by strong AI programs, and emphasizes taking sente. While it may not be the strongest local response, forming a three-stone wall is good shape and resilient, so it can be a good choice if Black intends to tenuki.

White's main options are to (A) jump ahead or (B) push. Tenuki is not advised.

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Moves are listed by frequency in professional games[1], which is sensitive to whole-board position. Bolded moves are commonly considered joseki.

4-4 Point 3-3 Invasion, Extend, Small Knight 4-4 Point 3-3 Invasion, Extend, One-Space Jump
[Diagram]
Simple extension  



Overview of Joseki

Jumping Ahead

Jumping Ahead

Small Knight
Small Knight
(~69%)[1]
Jump
Jump
(~22%)[1]

Push

Push

Small Knight
Push, Hane
(~17%)[1]
Small Knight
Push, Extend
(~4%)[1]
Small Knight
Push, Small Knight
(~4%)[1]



Discussion

The ladder is required for the one-space jump

Jumping ahead vs. Push?

[Diagram]
Oh Yujin (6p) vs. Wang Chenxing (5p) (2019)  



Tenuki is not advised

References

  • [1] Frequency statistics were obtained from [ext] Waltheri's Go Pattern Search using the full database restrained to a local search (accessed September 2021).

4-4 point 3-3 invasion, extension last edited by yuzukitea on September 16, 2021 - 06:24
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