Combine a pincer with an extension

    Keywords: Opening, Proverb

A pincer is a severe move, preventing an enemy approach stone to make a base. An extension maps out a sphere of influence making it more difficult for the opponent to approach. Combining a pincer with an extension obviously is interesting.



Bill: B2 is a bit far to be considered an extension, I think. It leaves room for a wariuchi at a, not to mention other invasions.
Charles Matthews I think you can't have a 'nine-space extension', because a wedge in it doesn't constitute an invasion. But I have been told (and believed) that 'eight-space extension' makes sense, as the maximum.
Dieter; Yes I was aware of the example not being optimal. Please replace with a better example and I'll try the same.

Example 2  

Charles In this case B1 looks efficient as a pincer on white+circle, and an extension from the black+circle formation.

Example 3  

dnerra And here an example where the extension B2 from the left is pretty solid. Probably White should consider playing W1 at a instead. In that case, a pincer would make Black overconcentrated.

Charles Isn't B2 almost too close to Black's group anyway? What about B2 at b? In fact Segoe played at c instead, against Go Seigen - this side formation is rare in pro play. But White more often plays the approach at d.

Otake-O Meien  

This from 1995-11-09 is an example of the comparable thing, just with less thickness for Black: B1 extends from black+circle while pincering white+circle.

Bill: What I was taught was that 5 spaces is the maximum for an extension, because, for instance:

6-space gap  

If you leave 6 spaces, the opponent has room for his own optimal extension inside yours.

Shusaku knew that ...  

Charles Shusaku played B3 here in one of his games. It's interesting to go back over some of these old ideas. In many cases they do relate to nineteenth-century go.

Combine a pincer with an extension last edited by BillSpight on April 15, 2003 - 03:36
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