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Answer the capping play with a knight's move
Path: GoProverbs   · Prev: NetsAreBetterThanLadders   · Next: ApproachFromTheWiderSide
    Keywords: Shape, Proverb

In fact, this proverb should probably read

Knight's move to a capping play when on the third line.

Third line

[Diagram]
Capping play and knight's move

Why this knight's move played? Probably because it is a double purpose move. Its first purpose is to make territory while connecting, ...


[Diagram]
Capping play and knight's move

... and its second to prepare an attack like in this diagram. For comparison ...


[Diagram]
Capping play and knight's move

If Black defends and connects at B2, he has no severe follow up so that White can ignore it and treat W1 as a forcing move.



Fourth line

[Diagram]
Capping play against the fourth line

This situation yields quite a different shape. In this case, an extension to B2 is better. It prepares an attack at B4.


[Diagram]
Capping play against the fourth line

Because the stones are one line higher, the keima has a weakness and does not cooperate too well with the follow up at B4.



I open up this proverb page as food for discussion. I have far from the theoretical background to back up these ideas but I do have the advice from Guo Juan and indeed experienced the strengths and weaknesses of the shapes discussed.

(later) I now realize that the answer may depend more of the surrounding stones than the line of the capped stone. See tower peep.

Dieter


Could these two proverbs summarized as:

Reply to a capping play with a one space jump to the 4th line.

Confused


Charles Matthews This is one case where database search does seem to support the proverb(s).

[Diagram]
Search region

I did a search for a region like this (marked points included), not anchored (so in any position along the side), and symmetrised for left-right reflection. Mostly this formation will arise as White capping Black's stone. The most common answer was Black at a (30%); then Black at b (15%), Black at c (13%), tenuki and White plays d (10%), Black plays e (8%).

In handicap go the answer at a is recommended, and it is also the common play in simple cases like this:


[Diagram]
Enclosure framework

Black does usually react with BC or the marked point.


Bill: Of course, this is an artificial position, as the right corner is open.
Still, playing BC leaves Black a bit overconcentrated in relation to the left corner.

Charles Something to that.

[Diagram]
The other way

This is from a pro game. B1 now opens up the position in a way Black at a wouldn't. For example Black can attack at b.

Looking at how the cap is handled in pro games, one sees tenuki quite frequently as an answer. As one would expect, if there isn't a local response that is good-looking.



I'd like to know more about the contact play and tenuki answers:



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This is a copy of the living page "Answer the capping play with a knight's move" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.