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4-5 point 4-3 approach
  Difficulty: Advanced   Keywords: Joseki

[Diagram]
4-3 approach to 4-5 stone

The conventional answer to W1 is the keima at a. The outside attachment b, the ogeima c, the downward thrust d and the inside attachment e are also treated here.

Looking at professional play, a and e are the common answers (not counting tenuki). Black b is much less common, other moves are very rare (for games of the last ten years I get e 55%, a 40%, b 5%, others 1% - Andre Engels)



1. Keima

[Diagram]
4-3 approach to 4-5 stone

White has approached at W1 and Black responded with the cover B2. How should White continue?

Dieter: Could it be that this joseki hasn't been covered yet here at SL ?

Charles I think that's true (except for the Get Strong at Joseki problem discussion, and the tenuki line).



This depends on the situation on the whole board[1]. When White played W1 she already knew, perhaps, what she was going to do.

  • Surviving with a, b or c. This is a good option if the resulting outward influence has already been reduced.
  • Cross-cut after a, b and hane by the opponent if there is a possibility to build some territory on the sides compensating for the corner.

There is an important ladder to consider after Black b.

Finally

  • White at d to start a cross-cut fight. This can be considered unreasonable in an opening position, but can be playable given the right conditions in the middle game.

2.

[Diagram]
4-3 approach to 4-5 stone

B2 is not often seen in pro play anymore, because it relies on a ladder. Nowadays, joseki involving ladders are experiencing a decrease in popularity. See ladder strategy discussion.

After W5, Black will cut at a or b. White will capture the cutting stone and Black takes either territory or influence. B4 at 5 is also playable. W3 at b also. W3 at c is not advisable: see six kyu noseki.

Tenuki with W3 is very rare: see 4-5 point 4-3 approach outside contact, tenuki.



3. Ogeima

[Diagram]
Ogeima

This ogeima variation can become pretty complicated. In fact W2 tenuki is recommended in this case (4-5 point 4-3 approach ogeima, tenuki.



4. Thrust

Here's an idea I've been toying with...TheDownwardThrust --BlueWyvern (Not joseki.)

[Diagram]
The Downward Thrust...


5. Inside attachment

[Diagram]
4-3 approach to 4-5 stone

This gives the same final result as in a 3-4 joseki (3-4 point high approach, keima); with the difference naturally that here Black starts and ends with sente.

It is also quite common for White to play tenuki here after B2. See 4-5 point 4-3 approach inside contact tenuki.



[1]

[Diagram]
Depends on the Overall Position?

Not always! This is the position after 19 moves in Tsukakoshi Tsuneyasu(White) - Takagawa Kaku, Spring Oteai, 1935-05-19. White responded to Black's initial 5-4 with an immediate play at 3-4 and the rest followed. :-) --DaveSigaty

So? I do think that both players took the emptiness of the rest of the board in account when choosing their josekis - Andre Engels



This is a copy of the living page "4-5 point 4-3 approach" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.