Big Sacrifice To Get A Wall
There is a rather standard sacrifice that comes up in several situations, which allows someone to build an impressive wall. The basic shape is this one:
White sets up a semeai with the geta
. The marked white stones are the sacrifice, they do not have enough liberties to the left to win the semeai.
There is either already a white stone at a, or white can add it in sente, so that black cannot break out of the geta
The end result will give white an impressive wall.
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Trick plays in joseki
Nineteen point trick play
One of the most famous examples is the 19 point trick play:
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4-4 ogeima enclosure
This same sacrifice pattern is found in this standard 4-4 enclosure
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Note that KataGo rates
White wins the semeai in the corner, but Black’s sacrifice has given him an impressive wall, worth much more than the corner points. Note: At | |||
3-4 high approach, keima joseki
The pattern occurs often with invasions of large knight move extensions:
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Another standard joseki situation. Again, the presence of the marked black stone makes the invasion Again, KataGo points to errors by both sides: | |||
3-4 high approach, one point jump joseki
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Another joseki variant, similar to the one above. Because of the low position of the marked stone, black cannot squeeze by cutting at As always, | |||
Example from professional play
This is Otani Motohiro (white) versus Kuwahara Munehisa in 1942. In this example, the sacrifice works even with best play by both sides.
![[Diagram]](../../diagrams/35/ad02835834b165884430b84e5e91fa7e.png)
is a move somewhere to the left, which prevents the marked stones from living
![[Diagram]](../../diagrams/22/13cde4069cd927e8913380f370dc6e28.png)
![[Diagram]](../../diagrams/1/6fdb5c4fb1a5c64fd2a054ffb4698c24.png)
![[Diagram]](../../diagrams/32/a52e4024cc30bedd1061fe18eaab4e03.png)
![[Diagram]](../../diagrams/48/6fcc57ca1f14a2c7ab34a43c3e055758.png)
@
)![[Diagram]](../../diagrams/29/33bf3b1ed6281193026a164dc23a3cf1.png)
is the trick play.
-
fall for it.
kills the corner, but that was black's intent all along. Black sacrifices and ends up with an impenetrable wall.
is usually not urgent, and black can keep it in reserve as a ko threat.
![[Diagram]](../../diagrams/34/16bd162d624414fab8f31be93b0171d4.png)
![[Diagram]](../../diagrams/34/17cfdff0009367e90c7e5cc2a9a0aec8.png)
![[Diagram]](../../diagrams/44/e421e8adef4a832e4d3877aa41cc619f.png)
![[Diagram]](../../diagrams/32/0772e1783a14a9e09bf19d8d382ec6cb.png)
is a standard invasion when black has nearby support.
as a small mistake,
as the decisive error and
initiates a
, white cannot break out into the center because of the Black atari at c.
![[Diagram]](../../diagrams/1/1e8096d331e968c3034e2f2e29027621.png)
![[Diagram]](../../diagrams/45/a08b03a66e79acbd9a62d5e6dc0c7729.png)
![[Diagram]](../../diagrams/49/f13760a7c80a40f2daaba7f13d8feca7.png)
![[Diagram]](../../diagrams/25/0c6a263b42047e37b8c84474098825ba.png)
![[Diagram]](../../diagrams/48/f32e78b7a963861b55da66d15a0b5ed3.png)
![[Diagram]](../../diagrams/19/2bdaf433170840f84bb52b5282d5d2cc.png)
![[Diagram]](../../diagrams/36/6bc1598f2817405c6e606058aa7d4c93.png)
![[Diagram]](../../diagrams/38/11dd2a7d9ab66307a76f1e22aa599b41.png)
, but
is still quite effective.
is not urgent and can be kept in reserve.
![[Diagram]](../../diagrams/31/a422d9507441db8914e349b5191d315a.png)
![[Diagram]](../../diagrams/35/3bc6d8c607622bc516cdf7a653804842.png)
![[Diagram]](../../diagrams/38/a8cf927d3d88722fada510edb43f71b4.png)
stones are captured instead.
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published under the ![Sensei's Library [Welcome to Sensei's Library!]](../../images/stone-hello.png)