4-5 point 4-3 approach inside contact, follow-ups
Difficulty: Expert Keywords: Joseki
![[Diagram]](../../diagrams/19/f0db4d3c5020d8616e8fb6c858009772.png) | Black has some aggressive plays |
Assuming White took sente at the end of this joseki, Black gets a chance to attack White.
According to the position as a whole, Black may wish to attack directly at the circle-marked point (a vital point of the diagonal of the stones); or to build influence with the cover at the square-marked point (discussed at order of play - temptation).
![[Diagram]](../../diagrams/40/67351ad134582f07e838e7e7520a3650.png) | Direct attack |
Suppose Black applies the direct approach . Then the pros usually come out at a. The play at b is a tesuji to help White gain immediate life.
![[Diagram]](../../diagrams/24/1c610183a1f949865016e0dbf1ff94ef.png) | Standard fight |
After here, the inducing move at is taught as tesuji. It is possible for White simply to play at c'.
![[Diagram]](../../diagrams/1/dd960c28be9e8c0dbb9edc393e5dba77.png) | Continuation |
This is a normal result: at will lead to nothing good for Black.
If instead , Black usually plays this way, treating White's play as submissive.
![[Diagram]](../../diagrams/22/92163c5fe228388cf39f096557bfd839.png) | A possible ko |
This is from a game Hashimoto Utaro-Suzuki Kensho (B), 1950-01-12. If here, it makes no sense to go back later to the circled point to play hane, after Black has filled in a liberty. So we get . Now it can become ko.
![[Diagram]](../../diagrams/0/6c187c6a599bd5239888f94391d7010c.png) | Game continuation |
![[Diagram]](../../diagrams/41/22324dd08b224b5e1baa9e417ed7f47c.png) | Game continuation |
There was no actual ko: White sacrificed the stones and in return weakened , as a big exchange happened.
![[Diagram]](../../diagrams/1/e5c1a524a7457e670d72e046ccd2f580.png) | White is thick |
Simply playing here gives White a high position, that is quite thick from fighting perspective. Later White can hope for White a, Black b as forcing.
![[Diagram]](../../diagrams/34/f246f1bd2c93a8a969017b953e4ef0e7.png) | One line more |
If instead here, White's shape is more efficient. But in this case Black can hope for a forcing exchange Black a-White b. That has an effect on any later white invasion at the circled point.
The tighter choice of is there generally seen, in pro games.
Charles Matthews
This is a copy of the living page
"4-5 point 4-3 approach inside contact, follow-ups" at
Sensei's Library.
2004 the Authors, published under the OpenContent License V1.0.
|