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.
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Moves are listed by frequency in professional games, which is sensitive to whole-board position. Bolded moves are commonly considered joseki.
- 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)
Push, Small Knight