4-4 point 3-3 invasion, extension

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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.

Table of contents Quick Navigation Overview of Joseki Jumping Ahead Push Discussion The ladder is required for the one-space jump Jumping ahead vs. Push? Tenuki is not advised References

Quick Navigation

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

Simple extension  

• a, 4-4 Point 3-3 Invasion, Extend, Small Knight - (joseki) (common) (beginner) (AI favorite)
• b, 4-4 Point 3-3 Invasion, Extend, Push? - (joseki) (common) (beginner) (AI favorite)
• c, 4-4 Point 3-3 Invasion, Extend, One-Space Jump - (joseki) (common) (AI favorite)

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Overview of Joseki

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Jumping Ahead

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

Push

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

Discussion

The ladder is required for the one-space jump

Jumping ahead vs. Push?

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

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Tenuki is not advised

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References

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