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ExtendFromACrosscut

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Extension
CrossCut
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BasicInstinct
AtariGoAsATeachin...
StrikeAtTheWaistO...
AtariFromCrosscut
Reversible
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CrosscutThenExten...
CrosscutThenExten...
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Pinwheel
BlackSheepRengo2003
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RespondToAttachme...
BasicInstinctCoun...
OneTwoThree/Discu...
StrangeProOpening3

 

Cross-cut then extend
    Keywords: MiddleGame, Proverb

The proverb Crosscut ? Then extend ( or The first to extend from a crosscut has the advantage) is somewhat misleading. There has been a lot of criticism that can be read at the /Technical Discussion page. A way to interpret the proverb is to reduce it to a not so common situation:

When there are no other stones nearby, extending from the crosscut gives the advantage

Some diagrams to explain. Let's quantify the result with the number of liberties.

[Diagram]
Isolated crosscut

An isolated cross-cut. Black to play.


[Diagram]
Atari and connect

It is tempting to play atari. Then connecting at B3 is a good idea. However, this strengthens White. She has two groups with an average of 2.5 liberties. Black has two groups with an average of three liberties; but it is White's turn.


[Diagram]
Extend

After the more defensive-looking extension it is White's turn. White has two liberties for both of her stones and Black has three liberties on average. Clearly this is an improvement to the atari-connect diagram.



Authors



Nobody seemed to object to my draft, so I replaced the old content of this proverb with the draft and moved the old content to a discussion page. --Dieter



This is a copy of the living page "Cross-cut then extend" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.