Shoulder invasion of mixed three space extension

    Keywords: MiddleGame, Joseki
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Invasion

Please elaborate.

Charles I'm having trouble finding examples for this. Next Black at a: what has White achieved?

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Invasion

Forces the ladder ? I opened these pages following a comment I have read somewhere about the v-shape of the recommended invasion points. --Dieter



Alex Weldon: What you're thinking of is Attack and Defense - the book by Davies and Ishida, where they suggest contact on the higher stone, shoulder hit on the lower stone or low invasion as the ways to invade this formation.
Charles You can see the first of those at attachment invasion of mixed three space extension. The shoulderhit move is there labelled a reduction play (too). On the whole it is better that SL doesn't copy books - even good ones such as Attack and Defense - the book .

HolIgor: What ladder?

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Invasion

B5 connects

The result may be not bad for white, but I don't see a ladder.

If white is strong on the right side then this is not a natural point to invade. If black is strong there white is under attack yet.


'Forces' is too strong, though: this B1 leaves Black with bad aji, but also White has played heavily.

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White tries something, but ...

This usually will be a failure for White. Charles

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Invasion

tapir: Not that I would advocate it, but what would happen now? How do all this change if white has a stone on the right side somewhere?

Andy: White can also look at W1 B2 as a forcing exchange and turn elsewhere. Of course, this hurts white's prospects of invading, so black should be strong to begin with here, otherwise white might prefer a more aggressive W1 like a.


This is a copy of the living page "Shoulder invasion of mixed three space extension" at Sensei's Library.
(OC) 2009 the Authors, published under the OpenContent License V1.0.
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