Kikashi / Examples

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Kikashi
Kikashi
Takagawa - Hashimoto U. 1952-07-09
Kikashi stones are light
Forcing moves
Forcing moves
Cho Chikun - Yamashita Keigo
Big Bulge Peep
The move you really want to play
Forcing move
Omitting the forcing move

Kikashi before living

[Diagram]
Kikashi  

Before living with W3, White makes a kikashi with W1. This is an example of the proverb play kikashi before living. This serves as a peep at the Black's tiger shape, forcing Black to answer at B2. It also has a local achievement too: by connecting the white+circle stone in sente, it enhances the strength of the White wall. As W1 is part of the White's wall, the proverb on sacrificing kikashi stones does not apply in this example.

[Diagram]
Kikashi  

Later, the peep at B4 is another typical example of a kikashi. Due to his marked tiger shape, White is already connected, and there is hardly any aji left in this position. So Black's move is justified: he forces White to confirm the choice she already made: connect her stones.

B4 does several things at a time: it destroys some eye shape, and it can serve as a ladder breaker later, or be a stone that is just in the right spot to win a capturing race. But B4 is a stone to be treated lightly. It is not an important stone. It is a kikashi stone.

The point of B4 is not to make white play at W5. The point of playing B4 there is that it might become useful in the future, and it is the fact that B4 forces white to play at W5 which enables black to play at B4 without losing sente.



Example from a pro game

[Diagram]
Takagawa - Hashimoto U. 1952-07-09  

Later in the game White starts to play against the kikashi stones but both players treat them lightly. With B4 Black is willing to let White cut off the two stones. However, W5 shows that White has no interest in such a small-scale capture.

[Diagram]
Kikashi stones are light  



Disposability as middle-game Joseki

[Diagram]
Forcing moves  

In this position, Black has a few forcing moves. He starts off with B1. If unanswered, White's position would completely crumble. B3 then forces White to take the two stones. White may decide (but is unlikely) to abandon her three stones, depending on the rest of the top side. Next, B5 forces once more to effectively take the stones off the board. Next, Black can play along the left side or connect around a.

B1 and B3 are mere sente moves, moves that are played to keep the initiative while building the position. B5 is the only example of kikashi, because the stone is treated as disposable:

[Diagram]
Forcing moves  

Later, close to the endgame, this may be played. The added value of black+circle is that it makes B2 sente again, compared to if Black had not forced White to capture as in the previous diagram.



Kikashi in a broader sense

[Diagram]
Cho Chikun - Yamashita Keigo  

In a game vs. Yamashita Keigo in the 29th Meijin league, Cho Chikun plays kikashi with W1 - W7 before strengthening his center group with W9. (See commentary at [ext] http://www.asahi.com/igo/meijin29/16/05.html.)

Despite the proverb about sacrificing kikashi stones, only W5 is in any danger.

The commentary says, 右辺を白70から76と利かし . White plays kikashi on the right side with W70 - W76.

These plays are more urgent because of White's running group. After White secures the group, they might not be so urgent.

[Diagram]
Big Bulge Peep  

B1 is a peep. Black can sacrifice B1 with b and d after White a.

From Charles Matthews - Shape Up! (p.48)

What is inside: 1. Kikashi ofcourse. 2. Shape, one way to use the Big Bulge and how to set it up. 3. Double purpose move. Not only in sense of the normal meaning of double purpose move. More in sense of the time changing purpose. First B1 is needed to get B3 in the right place. Later it will treated lightly to get a strong position. If W tenuki playing W2 elsewhere B1 is needed to cut. So this is another use of the Big Bulge here. Of course W tenuki is in this situation not the best idea, but this shows the dynamic of this shape. I will call it: A bunch of virtual live lines. In the moment where B1 is played all they exist, but only one get reality later (condensation). Therefore fixing a position reduce the value. From this point of view a good shape is a configuration which has enough nice future prospects to a brought variety of possible upcoming situations. A good feeling means than to look somehow in the future knowing which live lines from different possible shapes over the goban will work later nicely together. This maybe is also called luck, I guess. QWerner

Tapir: To my limited understanding it is far from clear whether B1 will turn out as kikashi. Imagine the Black stone on the right (black+circle) needs to make eyes later, B1 by disabling the attachment at k might as well turn out to be aji keshi.



Another example

Here is an example of a position where analysis with LeelaZero points to the existence of a forcing move

[Diagram]
The move you really want to play  

As pointed out by Go Seigen, Black really wants to approach at B1, as a counterexample of approach from the wider side. However ...

[Diagram]
Forcing move  

B1 is a forcing move, committing White to a locally optimal play. B7 forces White to connect at W8 (something she could have done at W2 already) and B7 now helps B3 and B5.

[Diagram]
Omitting the forcing move  

If Black plays B5 after approaching the corner, White can pincer at W6 and sacrifice the stones on the side in favor of an attack on B1 and B3.


Kikashi / Examples last edited by Dieter on December 3, 2019 - 18:20
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